- Open Access
Distribution of 31 endocrine-disrupting compounds in the Taihu Lake and application of the fish plasma model
Environmental Sciences Europe volume 32, Article number: 80 (2020)
The successful application of Fish plasma model (FPM) will greatly simplify the risk assessment of drugs. At present, the FPM has been applied to the risk assessment of several human drugs with high hydrophobicity. However, its applicability to a wide variety of compounds needs to be tested. Field work about distribution characteristics of endocrine disrupting compounds (EDCs) in water and in fish plasma plays a key role in promoting the successful application of FPM. However, there are few reports on the distribution of EDCs in fish, especially in wild fish plasma.
The distribution of 31 EDCs, including seven estrogens, eight androgens, six progesterones, five glucocorticoids, and five industrial compounds, in water and plasma of five categories of wild fishes in Taihu Lake was studied and the typical FPM was tested by the field data. The detected concentration of most compounds is relatively low (< 10 ng/L), and the industrial compounds are the predominant pollutants with the highest concentration up to 291.7 ng/L (Bisphenol A) in water. In general, glucocorticoids were detected at the highest concentrations in plasma of all kinds of fishes, followed by industrial compounds and estrogens. Except for glucocorticoids (up to 43.61 for Cortisone), the average concentrations of the other four categories of EDCs in fish plasma were generally low (< 10 μg/L). The available measured bioaccumulation factors (BAFs) of 20 kinds of EDCs were in the range of 0 to 5626. The bioaccumulation of EDCs in fish plasma is not only hydrophobicity-dependent, but is also both fish species-specific and compound-dependent. The classical FPM was tested and the results indicated that the good coincides of measured log BAFs and the theoretical log BCFs were only observed for limited EDCs (7 out of 20). The present available FPM generally underestimated the Log BAFs of most hydrophilic EDCs (log Kow < 3.87, 11 out of 20) whereas overestimated the Log BAFs of several high hydrophobic EDCs (Log Kow > 3.87) in fish plasma.
Although the present FPM is barely satisfactory, it is still promising for predicting the accumulation of EDCs in fish plasma and for further environmental risk assessment.
Endocrine-disrupting chemicals (EDCs) are a new type of contaminant that can interfere with the biological endocrine system and lead to potentially adverse ecotoxicological effects. A wide variety of EDCs are widely used, such as estrogens, androgens, progestogens, adrenocortical hormones, and industrial chemicals. EDCs exist widely in the environment; most of them have strong polarity and good water solubility. Because the treatment process of the sewage plants and drinking water plant can not completely remove them [1, 2], EDCs can enter the surface water environment through surface runoff, sewage treatment plant discharge and other different ways . EDCs have been widely detected in the water environment in China [4,5,6,7] and other countries [8,9,10], with the detection level of several ng/L. Although the level of EDCs in the environment is low, long-term low-dose exposure shows a negative impact on aquatic organisms , which has attracted widespread attention of the scientific community and the public . EDCs can affect the development of the reproductive system [13, 14]; long-term exposure to environmental concentrations of progesterone and norethisterone can affect the sex differentiation of zebrafish .
Taihu Lake, one of the five largest freshwater lakes in China, is one of the largest fishing areas in China, which provides abundant biological species resources and has a very important ecological service function. Numerous pollutants have been discharged into Taihu Lake due to the rapid urbanization and industrialization of the surrounding megacities, including EDCs and pharmaceuticals . To achieve sustainable development, the program of “Major Water Program of Science and Technology for Water Pollution and Governance” (2006–2020) was launched, and received support from other countries. Jia et al.  has shown that the native water samples from Taihu Lake show estrogenic activity in the laboratory and produce endocrine disorders on organisms indicating the existence of EDCs pollution in Taihu Lake. Several EDCs including E1, E2, E3, and BPA have been investigated in the Taihu Lake [5, 18, 19], with the highest detected concentration up to 194 ng/L for BPA. It is of utmost importance to investigate the occurrence and distribution of multi-class EDCs in the Taihu Lake. 17 EDCs including estrogens, androgens, adrenocortical hormones, progesterones, and industrial compounds were detected in the northern Taihu Lake in a recent study . The maximum detected concentrations of estrogens, androgens, progestogens, and adrenocortical hormones in the water samples were 6.02 ng/L, 3.11 ng/L, 1.01 ng/L, and 20.82 ng/L, respectively. BPA, BPS, and BPF were the most frequently detected chemicals, with the highest maximum concentration of 147.55 ng/L for BPA. However, current work only focuses on the northern Taihu Lake, and the seasonal variation and spatial distribution of EDCs in the Taihu Lake need further research.
Fish as a representative of aquatic organisms accounted for an important position in the potential ecological risk assessment of pollutants. Fish plasma model (FPM) , as a risk assessment tool, uses existing mammalian pharmacology and toxicological data to predict the environmental risk of drugs, including some EDCs. According to the model , when a drug accumulates to a certain level in plasma, it will affect a target of human, such as receptor or enzyme, and then produce pharmacological or toxicological effects. Studies  have shown that 86% of the targets (receptors, enzymes) of human drugs are conservative in fish, so drugs at the same concentration level will also affect another species (fish) with the same target. According to the read-across hypothesis and the fish plasma model, the closer the concentration of human drugs in the plasma of non-targeted organisms is to that of human therapeutic plasma, the greater the potential risk of drugs to organisms . Since the fish plasma model was proposed, it has been gradually used to assess the environmental risk of drugs [24, 25]. It is very important to determine the concentration of pollutants in fish plasma for elucidating the toxic mechanism of drugs and evaluating the environmental risk of drugs. Rumi et al.  have shown that the determination of human drug concentration in fish plasma is of great significance in assessing the risk of human drugs to wild fish. The successful application of the fish plasma model will greatly simplify the risk assessment of drugs. At present, the model has been successfully applied to the risk assessment of several human drugs, but it is only applicable to the pollutants with strong hydrophobicity, and its applicability to the ionizable pollutants needs to be tested.
Obtaining fish plasma concentrations of EDCs is the key to study and use the fish plasma model for risk assessment. The concentration of EDCs in fish plasma can be predicted based on the concentration detected in water by studying the plasma water partition coefficient (BCFplasma) of EDCs. Therefore, it is of great significance to study the EDC concentration in fish plasma and determine BCF . Yu et al.  determined 13 pharmaceuticals and EDCs in fish plasma, of which the average concentration of estrone was 4.63 ng/mL. Steele et al.  exposed 12 juvenile carp to medroxyprogesterone acetate aqueous solution with a concentration of 100 μg/L for 7 days, and determined the concentration of medroxyprogesterone acetate in plasma (160.0–1549.3 μg/L) by LC–MS analysis method, with an average content of 1047.4 μg/L, which is 4 times higher than the predicted value (256 μg/L) by fish plasma model . Besides, the BCF value of medroxyprogesterone acetate in plasma was 13, which indicated that the bioaccumulation ability of medroxyprogesterone acetate in carp was weak. The results of this study provide a partial framework for predicting the ecological risks of human health and medroxyprogesterone acetate. Distribution of EDCs in wild fish plasma plays a key role in promoting the successful application of fish plasma model. However, most of the existing plasma studies are laboratory exposure studies, and there are few plasma data of wild fish. The extensive application of the fish plasma model needs further field validation.
This paper investigated the seasonal variation and spatial distribution of 31 EDCs in the Taihu Lake, including seven estrogens, eight androgens, six progesterones, five glucocorticoids, and five industrial compounds. The distribution characteristics of EDCs in the plasma of five kinds of dominant wild fishes in the Taihu Lake were also investigated. The popular fish plasma model was tested by the data of wild fish plasma of Taihu Lake. Our work provides valuable data of the wild fish plasma, which promotes the further application of the fish plasma model in risk assessment.
Chemicals and standards
The chemicals used in the present study are provided in Additional file 1. The information of abbreviation, CAS, molecular weight, and the structural formula of the 31 selected EDCs can be seen in Additional file 1: Table S1. The analytes included seven estrogens, eight androgens, six progesterones, five adrenocortical hormones, and five industrial compounds.
The sampling sites were set in several key districts in the northeastern part of Taihu Lake including mainly Wuxi Taihu and Suzhou Taihu (Fig. 1). A total of nine sampling sites were chosen, including three sites in the highly polluted Meiliang Bay of Wuxi (S1, S2, and S4), a site in Wuxi Zhushan bay (S3), a site in Wuxi Gong Bay (S5), and four sites in Suzhou Taihu (S6–S9). Two sampling events were conducted in June (wet season) and December (dry season), 2016. In June 2016, the rainfall was 385.9 mm, and the average water level reached 4.01 m. In December 2016, the rainfall was 50.7 mm, and the average water level was 3.40 m . The water samples (4 L per site) were collected with a clean stainless steel sampler, and the sampler and pre-cleaned brown bottles were washed three times with the target water sample. The samples were stored at 4 °C to prevent degradation. Water samples were extracted within 2 days from the time of collection.
Carp (Cyprinus carpio) and crucian carp (Carassius auratus) are dominant species in Taihu Lake, while silver carp (Hypophthalmichthys molitrix), white stripe (sharpbell, Anabarilius), and spotted silver carp (bighead carp, Aristichthys nobilis) are important economic species in Taihu Lake. In this study, these five representative wild fish species were caught and their plasma was collected to determine the EDC. On September 6, 2016, 38 wild fish were caught in the middle of Taihu Lake, the basic information of the fishes is shown in Additional file 1: Table S2. After the laparotomy, blood was taken from the heart of the fish with a 1-mL syringe. The collected blood samples are stored in a centrifuge tube with EDTA sodium salt in advance to prevent blood from clotting. The blood samples are centrifuged to collect the supernatant plasma. The plasma samples were stored at − 20 °C before EDCs analysis.
Sample preparation and SPE
The water samples in triplicate (1 L each, adjust pH to 3.0 with formic acid) were spiked with internal standards at an absolute amount of 10 ng prior to the solid-phase extraction (SPE). SPE utilizing MCX SPE cartridges were performed on a Supelco (Madrid, Spain) vacuum manifold for 12 cartridges connected to a vacuum pump for the isolation and concentration of target EDCs. The cartridges were placed on an SPE element and conditioned sequentially with 6 mL of methanol and 6 mL of formic acid solution (pH = 3.0). Then, samples were loaded through the cartridges at a flow rate of 2–2.5 mL/min. After all the samples were filtered, the cartridges were dried under nitrogen and cleaned sequentially with 6 mL of formic acid solution (pH = 3.0). After that, the EDCs were eluted with 9 mL of 4.5% (V: V) ammonia/acetonitrile solution. The extracts were dried under a gentle stream of nitrogen and redissolved in 0.5 mL of 35% (V: V) menthol/water solution. Then, the solutions were filtered through a 0.22-µm PTFE filter unit (Millex, Billerica, MA, USA) and prepared for analyzing with UPLC–MS/MS (Waters Xevo TQ MS, Milford, MA, USA) with the corresponding mobile phase.
1 mL of plasma was pipetted into a Teflon centrifuge tube, 5 mL of acetonitrile was added to precipitate protein, and then, 0.5 mL of the internal standard with a concentration of 40 μg/L was added. The samples were mixed by vortexing, and then centrifuged at 9500 r/min for 15 min; finally, the supernatant was recovered in a glass centrifuge tube. The sample was dried with nitrogen, and then 1 mL of methanol was vortexed to dissolve the residue, 10 mL of formic acid aqueous solution (pH = 3.0) was added and vortexed, and the solid-phase extraction was the same as that of the water sample. The eluent was blown dry with nitrogen, made up to volume with 1 mL of methanol, and passed through a 0.22-μm PTFE needle filter membrane, and tested on the instrument under optimized chromatography conditions.
Analytical determination of EDCs
Ultra-performance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) analysis was performed using a Waters Xevo TQ MS Instrument Platform (Milford, MA, USA). The 31 EDCs were separated by a BEH C18 column. Details about the analytical method are shown in Additional file 1 (“Analytical determination of EDCs”). The measurement parameters and detection limits (LODs) for UPLC–MS/MS are listed in Additional file 1: Tables S3 and S4 (water) and Additional file 1: Table S5 (fish plasma). For water analysis, 31 EDCs showed a good linear relationship (R2 ≥ 0.99). The limit of detection was 0.01–3 ng/L, and the recoveries of tap water and surface water were 61.2% to 150% (20 ng/L), 54.4% to 141% (50 ng/L) and 51.6% to 127% (25 ng/L), 52.2% to 143% (100 ng/L), RSD < 25%. In the analysis method of fish plasma, the LOD was 0.0003 to 2 μg/L (Dexa, 10 μg/L), and the recoveries were 58.6% to 137.4% (E2-ben, 150%). These analytical methods had high sensitivity, good precision and selectivity, and fulfilled the requirements of EDCs detection in environmental samples.
Fish plasma model
The steady-state plasma concentration of compounds in fish (FSSPC) can be calculated according to the concentration of the compounds in water and the physical and chemical properties of the compounds. The classical fish plasma model was proposed by Huggett et al.  as following:
In the formula, EC is the concentration of a compound in water, PBlood:Water is the distribution coefficient of the compounds in plasma and in water, also known as bioconcentration factor in plasma (BCF), and PBlood:Water can be calculated by formula (2).
In this model, compounds with strong lipophilicity (log Kow) are more likely to enter the plasma of fish from the water phase. Therefore, the deficiency of the above model is that it is only applicable to the compounds with strong hydrophobicity, while it might show a large deviation for compounds with strong ionization ability. At present, most studies are based on the fish plasma model (formulas (1) and (2)) proposed by Huggett et al.  to calculate the FssPC. Considering the influence of pH on the compounds in plasma, Valentet al.  used Dow (conditional octanol–water partition coefficient) instead of Kow (octanol–water partition coefficient) to calculate the plasma water partition coefficient PBlood:Water (log PBlood: Water = 0.73 × log DOW − 0.88) of sertraline, and obtained the theoretical FssPC value of sertraline in plasma, which was in good agreement with the measured value ratio. Fu et al.  and Schreiber et al.  proposed to use the improved model to calculate PBlood:Water for substances with Log Kow value between 1 and 6.
Results and discussion
Occurrence, seasonal variation, and spatial distribution of EDCs in the water of Taihu Lake
Detection frequencies and levels of concentrations
Table 1 shows the average, median, maximum, and minimal concentrations as well as detection frequencies of the 31 EDCs at all the nine sampling sites in both sampling events. Except four compounds including Epite, Corti, Prednl, and Noreth were not detected in both summer and winter; the other 27 compounds were detected at varied frequencies (11–100%). The highest detection frequency of 100% is observed for three EDCs including DES, BPA, and BPS in both June and December at all the nine sampling sites. This suggests the wide applications of these three EDCs in Taihu area. Nan-phen, TES-pro, E2-ben, and BPF were detected at a frequency of 100% in winter, and E2-ben and BPF were also detected at a high frequency of 89% and 44% in summer. Four EDCs including TES-pro, Dexa, Predn, and Hexe were not detected in the wet season (summer); however, higher detection frequencies of 100%, 11%, 44%, and 89% were observed in the dry season (winter), respectively. In contrast, Tren and Norges were not detected in the dry season (winter), but higher detection frequencies in the range of 22% and 11% were observed in the wet season (summer). As for the categories of the EDCs, three out of five individual compounds and all seven estrogens were detected at high frequency in both June and December (44–100%), except for OP and NP (11–22%) and Hexe in summer (0%). Seven out of eight Androgens were detected at low frequencies (0–22%, except 56% for Bold) in summer; however, four out of eight androgens were detected at high frequencies in winter (44–100%, Nan-phen and TES-pro 100%; Me-TES 67% and TES 44%). Five out of six progesterones were detected at low frequencies in both summer (0–22%) and winter (0–56%), whereas higher detection frequencies were observed for Proges (89% in winter and 56% in summer). In general, adrenocortical hormones were detected at the lowest frequencies. In summer, only one out of five adrenocortical hormones (Me-prednl) were detected; in winter, low detection frequencies (0–44%) were also observed for four out of five adrenocortical hormones, and only a higher detection frequency was observed for Me-prednl (56%). In general, the detection frequency of EDCs in Taihu Lake is higher in the dry season than that in the wet season.
The highest concentrations of all 31 detected EDCs were typically below 10 ng/L in both summer and winter (Table 1), except five compounds including BPA (102.89 ng/L in summer; 291.70 ng/L in winter), BPS (45.35 ng/L in summer; 230.45 ng/L in winter), BPF (7.44 ng/L in summer; 114.03 ng/L in winter), Me-prednl (14.3 ng/L in summer), and Nan-phen (13.78 ng/L in winter). In June, the average concentrations were in the range of 0.19 to 28.57 ng/L, the median concentrations were in the range of 0.19 to 22.8 ng/L, and the maximum concentration was 102.89 ng/L (BPA). The average concentrations were below 1 ng/L for estrogens (except E3), androgens (except Tren), progesterones, and adrenocortical hormones (except Me-prednl) in summer. In December, the average concentrations were in the range of 0.33 to 84.87 ng/L, the median concentrations were in the range of 0.3 to 42.15 ng/L, and the maximum concentration was 291.7 ng/L (BPA). BPA showed the highest average concentrations in both June and December (28.57 and 84.87 ng/L, respectively), followed by BPS (10.2 and 37.35 ng/L, respectively) and BPF (3.62 and 21.98 ng/L, respectively). Progesterones showed low concentrations (< 1 ng/L) in both June and December. Individual compounds were predominant and the total concentrations accounted for 44% to 96% of all the five categories of EDCs in each sampling sites.
Seasonal variation and spatial distribution
It can be seen from Fig. 2 that the total concentration of each type of EDCs in the water samples of each sampling point is higher in winter (1–20 times) than that in summer as a whole, except for the progesterones at S1 and S2, the glucocorticoids at S2 and S4, and the industrial substances at S8 and S9. The results show that the concentration of phenolics EDCs is affected by many factors with the changes in high and low water periods. Water flow patterns, industrial wastewater discharge, discharge source distance, dilution effect, temperature, production consumption, and other factors will affect pollutant residues . When the temperature increases, the activity of microorganisms in the water will also increase. Some of the biodegradable substances will be consumed by microorganism metabolism, resulting in a decrease of their concentration in the water . In addition, in the wet season, affected by continuous rainfall and other factors, the water volume and flow rate of rivers and lakes are not stable, and the flow pattern changes greatly. In the wet season, aquatic plants in the water can absorb phenol at the same time. Based on the above factors, the concentration of EDCs in Taihu Lake water in summer is significantly lower than that in winter. However, in the dry season, there is less rainfall, the dilution effect of water flow in winter is weakened, the mobility of water flow is poor, and the flow pattern is relatively stable. Therefore, the concentration of pollutants in water in winter will increase relatively, which is the same as the conclusion of Cailleaud et al.  in the study of seasonal changes of alkylphenol in Seine River. The detected numbers of EDCs at each sampling point in winter and summer were compared, as shown in Additional file 1: Figure S1. It can be seen that the number of EDCs detected at each sampling point in winter is higher than that in summer, which proves that the concentration of substances detected in the low water period is higher than that in the high water period on the whole.
Industrial compounds and estrogens are the main pollutants in the surface water of Taihu Lake. BPA, BPS, and BPF are the main detected substances of industrial compounds. In winter, Taihu Lake is more seriously polluted by industrial compounds. The species and concentration of EDCs in different sampling points were different. Yan et al.  tested the EDCs in Taihu Lake water. The detection frequency of E2, E3, and BPA was 100%.
For the spatial distribution, as a whole, the EDC concentrations in Wuxi Taihu Lake (North Taihu Lake, S1–S5) is higher than that in the Suzhou Taihu Lake (East Taihu Lake, S6–S9), which is consistent with our previous drug research results . The concentration of EDCs in different spatial sampling points also varied greatly, which may be caused by the different hydrological conditions of the lake water in different periods. Further work including more sampling events would be required to give a definitive seasonality. S1, S2, and S3 sampling points are located in Meiliang Bay and Zhushan Bay of Wuxi, which are economically developed and have serious industrial pollution. Meiliang Bay and Zhushan Bay, as receiving water bodies, receive a large amount of sewage from sewage treatment plants in surrounding towns and untreated domestic sewage . Meiliang Bay has been polluted seriously over the years. The water quality of the lake is generally V-type or inferior V-type, and the water exchange is slow, basically in a semi-closed state. There are many chemical plants along the main river flowing into Zhushan Bay (S3), about 26,000 tons of BPA are put into use as raw materials or standby materials every year, and the industrial wastewater discharged into the river by the chemical plant can reach 23,400,000 tons every year. Liu et al.  measured the EDCs in the tributary water of Taihu Lake, and found that the concentration of industrial compounds detected in Caohe was the highest (1380 ng/L), which increased the concentration of S1 after flowing into Taihu Lake. S4 is located near Lihu bridge. Lihu Lake is the inner lake of Taihu Lake stretching into Wuxi. It is the closest to the downtown of Wuxi City among all sampling points. The surrounding population is dense. There are about 50 hospitals and clinics. The discharge of a large number of municipal wastewater and domestic sewage may be the main reason for the high concentration of EDCs in S4 point . S5 is located in Gonghu Bay and at the entrance of Wangyu River. As shown in Fig. 2, the total detected concentration of estrogen in S5 is relatively high (3.75 ng/L in summer and 11.9 ng/L in winter). Wangyu River is a project river of “diverting the river to the Taihu Lake”. Liu et al.  measured the EDCs in the Yangtze River water of Nanjing section, and found that the concentration level of phenol EDCs in the Yangtze River water was a higher than that in Taihu Lake. Hu et al.  detected a high concentration of estrogen in the Yangtze River, which entered Taihu Lake with the branch water of the Yangtze River (S5), which may be one of the reasons for the high concentration of estrogen in S5 . According to Jiang et al. , both the activity of estrogen and the concentration of estrogen in the Yangtze River water are at the forefront of China. S6 is close to Suzhou, where the population is dense and animal husbandry and aquaculture are prevalent. Therefore, there are more estrogens discharged, resulting in higher concentration of four kinds of EDCs except industrial compounds in winter. A small amount of estrogen and androgen were detected in S7, S8, and S9. S7 is close to the center of the lake, most of which are villages and scenic spots, with relatively less pollution. S8 is close to Xukou. Xukou town has rapid economic development in recent years. At the same time, S8 is located at the Hukou of Xujiang river. There are many villages and fishing villages along the Xujiang river. Most of the discharged domestic sewage and aquaculture wastewater are directly discharged into the river, and finally into Taihu Lake. S9 are close to Wuqi farm, with developed aquaculture and untreated wastewater. The aquaculture wastewater is directly discharged into Taihu Lake, which results in the detection of estrogen and androgen concentrations in S7, S8, and S9. In a word, the spatial distribution of EDCs is affected by hydrology, population density, industrial wastewater discharge, aquaculture, and river diversion project.
Comparison of EDCs’ pollution level with domestic and foreign water environment
The concentration of EDCs in the water phase of Taihu Lake was compared with that at home and abroad, see Additional file 1: Table S6 for details. In general, the concentration of EDCs detected in Taihu Lake is relatively high in winter. The concentration range of 31 kinds of EDCs detected in Taihu Lake is 18.6–338.05 ng/L in winter and 16.22–112.69 ng/L in summer. In addition, BPA, BPS, and BPF are the main EDCs detected in the water phase. The other two substances with relatively high detection frequency and concentration in Taihu Lake are estrogen (3.55–14.19 ng/L) and androgen (1.22–15.5 ng/L), respectively. Taking the BPA with the highest concentration (2.38–291.7 ng/L) detected in Taihu Lake as an example, which is lower than that in Yangtze River (Nanjing section) (nd–563 ng/L) , Pearl River (4–377 ng/L) , Liaohe River (12.3–755.6 ng/L) , slightly higher than that in Yellow River (12.5–171.5 ng/L) , and the same concentration level as Chaohu Lake (7.3–224.9 ng/L) . Compared with foreign studies, it is lower than the concentration levels in Iberia (0.11–649 ng/L) and Singapore (nd–2470 ng/L) , and higher than those in Italy (nd–145 ng/L) , Spain (6–126 ng/L) , Australia (4–59 ng/L) , and Nigeria (not detected) . It can be seen that BPA in surface water of Taihu Lake shows a moderate pollution level. Compared with the detected concentrations of EDCs in surface water at home and abroad, the EDCs in Taihu Lake are in the moderate and low pollution level.
Distribution characteristics of EDCs in plasma of wild fish
Concentration levels and detection frequencies of EDCs in wild fish plasma
The detection concentration levels and detection frequencies of 31 EDCs in the plasma of five wild fishes are shown in Table 2. The detection frequencies of 31 EDCs in the plasma of five kinds of wild fish were between 0 and 100%; 8 EDCs including 1 androgen (Tren), 3 glucocorticoids (Dexa, Prednl, and Prednl), 1 estrogen (E2), 1 progestogen (Me-ace), and 2 industrial compounds (OP and NP) were not detected in all plasma samples, and the other 23 EDCs were detected in varying degrees. The total detection frequency (n = 20) of androgen was between 5% (Noreth) to 35% (Nortes), except for tren (0%). For glucocorticoids, only Corti (100%) and me-prednl (10%) were detected. For estrogens, the detection frequency was between 5% (Dieno) and 100% (E2 Ben), except that E2 was not detected. For progesterones, except for Me-ACE (0%), other compounds were detected in the range of 5% (TES-pro) to 55% (hydrop). For industrial compounds, only BPA (45%), BPS (40%), and BPF (20%) were detected. Comparing the distribution of EDCs in the plasma of different kinds of wild fish, the detection frequencies of tes (63%), nortes (63%), and hydrop (75%) in the plasma of carp were higher than that in the plasma of other four kinds of fish. The detection frequencies of Norges were 100% in the plasma of silver carp and 0% in the other four kinds of fish. The detection frequencies of industrial compounds (BPA, BPS) in carp, crucian carp, silver carp, and plasma were higher, while that in spotted silver carp was 0%. This may be because BPA is difficult to dissolve in water, and easily adsorbed on sediment and SPM in water environment. While spotted silver carp mainly lives in the middle layer of water body, so it is difficult to contact BPA. At the same time, the size of spotted silver carp is usually large, and the particles absorbed in the body are easy to be discharged.
The total concentrations of the five categories of EDCs varied, with the values of 17.31 μg/L (androgens), 10.55 μg/L (progesterone), 41.5 μg/L (estrogens), 37.6 μg/L (industrial compounds), and 351.15 μg/L (glucocorticoids), respectively. In terms of the maximum detected concentration in plasma of Carp (n = 8) and silver carp (n = 5), except Corti (43.61 μg/L in Carp and 37.24 μg/L in silver carp), the highest detected concentration of other substances is no more than 10 μg/L, and the lowest detected concentration of 25 EDCs is less than 1 μg/L. However, the average total concentration of EDCs (10.15 μg/L to 27.53 μg/L) in the plasma of five kinds of wild fish is not significantly different.
It is worth noting that the detection frequency of E2-ben in plasma is 100%, which is consistent with the detection of E2-ben in the water phase. E2-ben is more easily enriched in the organism due to its high Log Kow value (5.47). BPF was detected in water with high concentration and frequency, but rarely in fish plasma. Yu et al.  determined the EDCs in the plasma of sea bass, and found that the concentration range of E1 was 2.98–7.52 μg/L, and the detection range of BPA was 1.18–6.21 μg/L, which was similar to the detection level of BPA in the plasma in this study. Eight of the 31 EDCs were natural hormones, including Epite, TES, Corti, E1, E2, E3, Hydrop, and Proges. Corti as a natural glucocorticoid was detected in all plasma, and the concentration of Corti was very high, ranging from 1.59 to 43.61 μg/L. In addition, the detection frequency of Corti, Epite, and Tes-pro in water was 0%, but they were detected in fish plasma to different degrees, which may be due to the low content of this pollutant in water (lower than the detection limit of the instrument and cannot be quantified) and bioaccumulation of these compounds in fish. Also, because this kind of EDCs can be secreted and metabolized by a certain organ (adrenocortical fat) in vivo, the possibility of endogenous compounds cannot be excluded. In addition, the more frequent detection of Hydrop in all plasma samples may be related to it is a natural synthesized hormone in the fish.
Distribution of EDCs in plasma of different species of wild fish
The distribution of five categories of EDCs in the plasma of five kinds of wild fishes in Taihu Lake is shown in Fig. 3. From the perspective of material classification, the detection level of androgens in carp plasma (0.43–2.95 μg/L) is generally higher than that in crucian carp and silver carp (0.13–0.6 μg/L), and the detection level of glucocorticoids in spotted silver carp plasma is generally lower (1.59–21.44 μg/L) than that in other four kinds of fish. The concentrations of estrogens in the plasma of crucian carp and silver carp (0.3–10.58 μg/L) were higher than those of other kinds of fishes. The concentrations of progesterones in the plasma of spotted silver carp were slightly higher than those of other kinds of fish, and the concentrations in the plasma of crucian carp and silver carp were comparable. The concentrations of industrial compounds in the plasma of crucian carp (0–7.19 μg/L), carp (0.5–9.6 μg/L), and silver carp (0.35–7.19 μg/L) were comparable, but not detected in the plasma of spotted silver carp. In general, except for glucocorticoids, the concentrations of other four kinds of EDCs (Estrogens, androgens, progesterones, and industrial compounds) in fish plasma were generally low (< 10 μg/L), and except for glucocorticoids and progesterones; there was no significant difference in the concentrations among the varied fishes for androgens, estrogens, and industrial compounds.
The total concentrations of each category of EDCs in the plasma of five kinds of wild fishes are shown in Fig. 4. In general, glucocorticoids were detected at the highest concentrations in all kinds of fishes, followed by industrial compounds and estrogens. The total concentrations of androgens in the plasma of carp range from 0.43 to 2.95 μg/L, estrogen from 0.15 to 3.4 μg/L, and industrial compounds from 0.5 to 9.6 μg/L. The total concentrations of glucocorticoids in the plasma of silver carp range from 0.44 to 37.24 μg/L, estrogens from 0.3 to 10.58 μg/L, and industrial compounds is 0.35–7.19 μg/L. These differences may be due to the differences between carp and silver carp, including the physiological differences in the absorption, metabolism, and elimination of pollutants. The result indicates that the distribution of EDCs in fish plasma is species-specific and compound-dependent.
Bioaccumulation factors (BAFs) of EDCs in fish plasma
The study of bioaccumulation is of great significance in clarifying the migration and transformation of substances in the ecosystem and evaluating the possible impact of pollutants on the environment. It provides a scientific basis for the determination of environmental capacity and environmental standards. At present, BAFs have been used to quantitatively describe bioaccumulation, which is defined as the ratio of target pollutant concentration in fish to concentration in water. In the EU risk assessment system, compounds with BAF > 2000 are considered to show bioaccumulation, while compounds with BAF > 5000 are considered to show high bioaccumulation [49, 50]. To evaluate the bioaccumulation capacity of EDCs in fish plasma, the BAF value in fish plasma of each EDCs was calculated. However, 11 compounds neither detected in the water (Epite, Corti, Predn, Noreth) nor detected in the fishes (Tren, Dexa, Predn, Prednl, E2, Me-ace, OP, and NP) were excluded for BAF calculation. For the undetected substances in serval water or fish samples, take half of the value of each self-inspection limit . Table 3 shows the calculated average BAF values of 20 EDCs in five kinds of fish plasma.
From Table 3, it can be seen that the measured BAF values of 20 kinds of EDCs varied (0–5626). Most of the measured BAF values of EDCs in the plasma of five kinds of fishes are comparable, and most of EDCs do not show bioaccumulation; no significant interspecific difference is observed, and no relationship with fish weight/body length is observed. This result is consistent with a previous study  which investigated the absorption of human use drugs in the plasma of Carassius auratus (Crucian carp) and Cyprinus carpio (Carp). The highest mean BAF value was observed for E3 (575 to 5626, LogKow 2.45), flowed by TES (373 to 3093, LogKow 2.99), Norges (250 to 2460, LogKow 3.8), Hexe (625 to 1400, LogKow 4.98), E2-ben (104 to 1572, LogKow 5.47), Hydrop (60 to 1390, LogKow 3.16), and Me-pro (1474 in Carb, LogKow 3.5). Only 3 compounds including E3, TES, and Norges show bioaccumulation capacity (BAF > 2000) in different kinds of fishes. The BAF value (5626) of E3 in crucian carp plasma is higher than that of the other four kinds of fishes, showing high bioaccumulation. At the same time, E3 shows bioaccumulation in silver carp plasma (BAF 2632), while Norges only shows bioaccumulation (BAF 2460) in spotted silver carp plasma. The BAFs of 13 out of the 20 EDCs were below 1000, of which the lowest BAFs (< 100) were observed for Nan-phen (Log Kow 2.62), Proges (Log Kow 3.87), BPA (Log Kow 3.32), and BPF (Log Kow 2.97). The BAF of BPA in the plasma of crucian carp (45–116), carp (15–129), silver carp (19–23), and white stripe (44) was found to be comparable, which is consistent with the results of Liu et al.  in the bioaccumulation of BPA in wild carp (29) and wild crucian carp (18) in Dianchi Lake. However, the BAF value of BPA in our study is slightly higher than that of crucian carp and carp in Dianchi Lake, which also reflects the difference of water quality between Taihu Lake and Dianchi Lake. At the same time, the lower BAF value indicates that the bioaccumulation ability of BPA in fish is weak, which is also reflected in other fish (medaka 20–68, rainbow trout 1.7–38.4) [52, 53]. Another study of the Taihu Lake found that BPA (BAF = 1025) has a low capacity for bioaccumulation in fish muscles . Similar to this study, also found that E2 had low bioaccumulation capacity in fish muscles from Luoma lake. NP and OP were not found to have bioaccumulation in this study, but the BAFs for NP (BAF = 278.19) and OP (BAF = 100.60) in fish muscles from Luoma lake were investigated, and the BAFs of NP in Taiwan (BAF = 6400) and European river basin (BAF = 439) were much higher than those in this study [5, 55, 56]. The comparison is not straightforward as the characteristics which could be explained by hydrophobic and metabolic characteristics, environmental characteristics (emission source, temperature, pH, etc.) as well as by organisms’ characteristics (lipid content, health status, and gender or life stage) which could affect the distribution of the compounds. As shown in Fig. 5a, the overall trend of measured log BAF increased linearly with the increase of Log Kow values of EDCs, although the linear correlation is not significant (P > 0.05, R2 = 0.0428 to 0.1520). This result indicated that the bioaccumulation of EDCs in fish plasma is not only hydrophobicity-dependent, but also both fish species-specific and compound-dependent, which is consistent with previous work . The distribution of endocrine disruptors in water environment is quite different due to their different material properties. Different fishes have different life habits, activities’ space, and food choices. In addition, the metabolism levels of different substances in different fishes are also different. Further work considering the tissue distribution and metabolism of the EDCs in the fish should be conducted.
Application of the fish plasma model
The classical fish plasma model (formula (2)) proposed by Huggett et al.  and the improved model (formula (3)) proposed by Fu et al. . and Schreiber et al.  were tested, and the PBlood:Water, i.e., the theoretical BCF value, was calculated and compared with the measured BAF value. The theoretical BCF values and average measured BAF values of 20 EDCs (other 11 EDCs indulging Epite, Corti, Predn, Noret, Tren, Dexa, Predn, E2, Me-ace, OP, and NP were neither detected in the water or in the fish were emitted for the calculation) in five kinds of fish plasma are shown in Table 3. It is found that the theoretical BCFs calculated by the classical FPM (Formula 2, BCF0) are close to the measured BAFs for seven EDCs, including Nan-phen (LogKow 2.62), ME-TES (LogKow 3.61), E2-ben (LogKow 5.47), DES (LogKow 5.07), Hexe (LogKow 4.98), BPA (LogKow 3.32), and BPS (LogKow 2.91). In general, both the classical FPM and the improved FPM underestimate the BAFs of 11 EDCs, including TES (LogKow 2.99), Bold (LogKow 3.0), Nortes (LogKow 2.78), TES-pro (LogKow 2.97), Me-prednl (LogKow 1.5), E1 (LogKow 3.13), E3 (LogKow 2.45), Me-pro (LogKow 3.5), Hydrop (LogKow 3.16), Norges (LogKow 3.8), and BPF (LogKow 2.91). The BAFs of E2-ben (LogKow 4.98) and Dieno (LogKow 5.9) were overestimated by the classical FPM, whereas the BAFs of five EDCs including E2-ben (LogKow 4.98), Dieno (LogKow 5.9), DES (LogKow 5.07), Hexe (LogKow 4.98), and proges (LogKow 3.87) were overestimated by the improved FPM. This results suggested it should be carefully to use the FPM models, since it either underestimated the BAFs of hydrophilic EDCs (logKow < 3.87) or overestimated the BAFs of high hydrophobic EDCs (LogKow > 3.87) in fish plasma. The relationship between measured logBAF and the theoretical logBCF calculated by the FPM is clearly displayed in Fig. 5b, c. The overall trend was that the measured logBAF increased with the increasing of the theoretical logBCF, although the linearity was not significant (P > 0.05). The good coincides of measured logBAF and the theoretical logBCF are only observed for limited EDCs. Compared with the classical FPM and the improved FPM, the former model seems superior to the latter which greatly overestimated the BAFs of high hydrophobic EDCs (LogKow > 3.87). In general, although the present FPM is barely satisfactory, it is still promising for predicating the accumulation of EDCs in fish plasma and for further environmental risk assessment.
Fish plasma model is a risk assessment tool that can quickly screen out priority control pollutants. Based on the ratio of the therapeutic effect data of the existing drugs in mammalian plasma to the theoretical data of fish plasma predicted by the model, the effect ratio (ER) can be calculated, and the environmental risk of the drugs can be quickly determined according to the value of ER. Therefore, the establishment of a prediction model suitable for a variety of pollutants is the key to promote the risk assessment work, and will greatly simplify the risk assessment work. However, at present, there is a lack of data on the treatment of EDCs in human plasma, and the model is only applicable to a few compounds. Its universality needs to be continuously verified, and a large number of plasma and field data are still needed to improve the existing fish plasma model.
In this study, the temporal and spatial distribution characteristics of 31 kinds of EDCs in Taihu Lake water were investigated. The detection frequency of industrial compounds (22–100%) and estrogens (44–100%) was higher. The detected concentration of most compounds is relatively low (< 10 ng/L), and the industrial compounds are the predominant pollutants with the highest concentration up to 291.7 ng/L (BPA). During the dry season in winter, the detection level of EDCs in Taihu Lake is higher than that in summer. The detection concentration of EDCs in the north of Taihu Lake is higher than that in the East. The spatial distribution of EDCs is affected by hydrology, population density, industrial wastewater discharge, aquaculture, and river diversion project.
The detection frequencies of 31 EDCs in the plasma of five kinds of wild fish was between 0% and 100%; 8 EDCs including 1 androgen (Tren), 3 glucocorticoids (Dexa, Prednl, and Prednl), 1 estrogen (E2), 1 progestogen (Me-ace), and 2 industrial compounds (OP and NP) were not detected in all plasma samples. In general, glucocorticoids were detected at highest concentrations in all kinds of fishes, followed by industrial compounds and estrogens. Except for glucocorticoids (up to 43.61 for Corti), the average concentrations of other four categories of EDCs (estrogens, androgens, progesterones, and industrial compounds) in fish plasma were generally low (< 10 μg/L). The bioaccumulation of EDCs in fish plasma is both fish species-specific and compound-dependent. The measured BAF values of 20 kinds of EDCs were in the range of 0 to 5626. Most of the measured BAF values of EDCs in the plasma of five kinds of fishes are comparable, and most of EDCs do not show bioaccumulation (BAF < 2000), and no significant interspecific difference is observed. The overall trend of measured logBAF increased linearly with the increase of LogKow values of EDCs, although the linear correlation is not significant (P > 0.05, R2 = 0.0428 to 0.1520). This result indicated that the bioaccumulation of EDCs in fish plasma is not only hydrophobicity-dependent. The FPM was tested and the results indicated that the good coincides of measured logBAF and the theoretical logBCF are only observed for limited EDCs. The present available FPM generally underestimated the LogBAFs of most hydrophilic EDCs (logKow < 3.87) and overestimated the LogBAFs of several high hydrophobic EDcs (LogKow > 3.87) in fish plasma. In general, although the present FPM is barely satisfactory, it is still promising for predicating the accumulation of EDCs in fish plasma and for further environmental risk assessment.
In this study, the EDCs in the plasma of wild fish were determined, and some basic data were obtained. The existing fish plasma model was verified, but the data obtained were still insufficient. It was found that the fish plasma model was more suitable for some non-ionizing molecular EDCs, leading to little difference between the theoretical BCF and the measured BAF, and they were not easy to generate bioaccumulation. However, the fish plasma model was not suitable for EDCs with log Kow < 3. Because they were easy to ionize to form ionized substances and difficult to pass through the cell membrane, the theoretical BCF value is much smaller than the measured BAF value. A large number of experiments and field data are still needed to verify and improve the fish plasma model. To improve the model, it is a clear choice to consider the effect of pH on the ionization. For ionizable substances, their logKow should be multiplied by a correction factor in the model. More studies are needed to help build the model in order to simplify the risk assessment of pollutants, improve the efficiency of assessment, and achieve the purpose of quickly screening out the priority control pollutants.
Availability of data and materials
All data generated or analyzed during this study are included in this published article (and in Additional file 1).
Fish plasma model
- log Kow:
Logarithms of octanol–water partition coefficient
Ultra-performance liquid chromatography–tandem mass spectrometry
- PBlood:Water :
Distribution coefficient in plasma and in water
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The authors thank Taihu Lake Ecological Research Station for providing laboratory for fish dissection.
This study was funded by the National Natural Science Foundation of China [Grant Numbers 21577103, 21777122], the Major Science and Technology Program for Water Pollution Control and Treatment [Grant Number 2017ZX07207002] and the International Science and Technology Cooperation Program of China [Grant Number 2016YFE0123700].
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Additional file 1: Text. Chemicals and standards. Analytical determination of EDCs. Table S1. CAS, molecular weight, structural formula and log Kow of the 31 selected EDCs. Table S2. Common names, Chinese name, scientific names, sampling number (N), Length and weight of wild fish from the Taihu Lake. Table S3. MS parameters and retention time of 31 EDCs. Table S4. Linear range, correlation coefficients (r2), regression equations, LOQ of 31 EDCs and LODs in Water. Table S5. Linear range, correlation coefficients (r2), regression equations, LOQ of 31 EDCs and LODs in fish plasma. Table S6. Comparison of EDC concentrations at home and abroad (ng/L). Figure S1. The number of detected EDCs in each sampling sites in summer and winter in the Taihu Lake.
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Bao, Y., Huang, W., Hu, X. et al. Distribution of 31 endocrine-disrupting compounds in the Taihu Lake and application of the fish plasma model. Environ Sci Eur 32, 80 (2020). https://doi.org/10.1186/s12302-020-00347-0
- Endocrine-disrupting compounds
- Wild fish
- Fish plasma model