- Open Access
Reduction of soil contamination by cypermethrin residues using phytoremediation with Plantago major and some surfactants
Environmental Sciences Europe volume 31, Article number: 26 (2019)
Surfactant-enhanced phytoremediation is an eco-friendly treatment for reducing soil contamination. Cypermethrin (CYP) is one of the most widely used pyrethroid insecticides against different pests, and its use causes soil contamination. The aim of this study was to investigate the removal of CYP from contaminated soil by Plantago major (PM) and some surfactants. For the first time, we documented the uptake and translocation of CYP from the soil and used some strategies to improve the effectiveness of this technology, which involved the use of various surfactants to solubilize the contaminant. In a pot experiment, four surfactants [liquid silicon dioxide (SiO2, 750 mg L−1), 2-hydroxypropyl-beta-cyclodextrin (HPßCD, 1%), humic acid (HA, 10 mg L−1) and Tween 80 (Tw80, 9.2 mg L−1)] were used to facilitate the phytoremediation of CYP (10 µg g−1)-contaminated soil by PM.
Our data showed that amending the soil with PM plus SiO2 significantly reduced the amount of CYP in the soil and highly increased the concentrations of CYP in the plant roots and leaves. The longest half-life value (t1/2) of CYP was in the sterilized soil treatment (24.8 days), and the shortest was in the soil with PM amended with SiO2 (6.41 days). The half-life value (t1/2) of CYP in soil with PM alone was 10.0 days. Through in vitro experiments, a batch equilibrium technique showed that hydroxypropyl-ß-cyclodextrin (HPßCD) is the best surfactant to most efficiently eliminate CYP from the soil. However, in the greenhouse experiment, the addition of SiO2 to soil cultivated with PM was more effective than the use of other solubility-enhancing surfactants in the removal of significant amounts of CYP (p > 0.05) from the contaminated soil.
The integration of SiO2 + PM is the best treatment and is recommended for minimizing plant contaminant contents in CYP-contaminated soil.
Millions of megagrams of pesticides annually have been applied in agriculture to increase production by reducing the harmful effects caused by organisms such as viruses, fungi, insects, bacteria, and weeds that grow among economic crops . Pesticide consumption around the world increased from 2285 Gg active ingredients year−1 in 1990 to 4088 Gg active ingredients year−1 in 2016 . One of the most substantial problems with pesticide application is their persistence in the environment; moreover, chemicals applied to agricultural fields may be transported to and pollute other ecological systems . Subsequently, these toxic compounds have been involved in various disorders and diseases, including tremors, fasciculation, convulsion, coma, pulmonary oedema, respiratory failure and cardiac conduction disturbances . Cypermethrin (CYP) is a synthetic pyrethroid insecticide that is used worldwide on crops to control a wide range of insects [5, 6]. CYP has carcinogenic and cocarcinogenic potentials and can produce compounds with endocrine activity, such as 3-phenoxybenzoic acid  and oestrogenic activities . The hydrophobic properties of pyrethroids generally cause strong sorption of these compounds into soil particles, which may cause the formation of bound residues  and render CYP rather immobile in soil due to its high log KOC value (soil adsorption coefficient) . Moreover, the environmental fate of CYP under ambient conditions is controlled by abiotic factors, such as temperature, redox potential, pH, humidity, organic matter content and light intensity, and, most importantly, also likely by microbial catabolism [11, 12]. CYP was reported to have a very high octanol–water partition coefficient (Kow = 3.98 × 106). Consequently, it strictly binds to organic matter . As a result, this pesticide causes high contamination of the soil and thus affects non-target organisms. To the best of our knowledge, no reports have been published about the remediation of CYP-contaminated soil.
There are many methods (excavation, physical removal and in situ fixation) to remove toxic hazards from soil. Despite their high efficiency, the majority of these techniques are very expensive . Moreover, in addition to these processes, growing plants can help contain or reduce hazard toxic pollution. This is often called phytoremediation . Phytoremediation, one of the most environmentally sound and cost-effective methods for the decontamination and detoxification of pesticide-contaminated environments, is an emerging technology that utilizes green plants and their associated rhizosphere microorganisms to clean polluted environmental media, especially to remove contaminants from soil and water, such as persistent organic pollutants , chemical-industry’s organic pollutants  and pesticides . Phytoremediation not only uses plants by several methods to contain or clean up toxic hazards but also has the benefit of being a relatively low-cost, natural solution to an environmental problem . The uptake, accumulation, translocation and metabolism of micro-contaminants by plants have been suggested as being important mechanisms for phytoremediation technology . Phytoremediation takes benefit of the selective and unique absorption abilities of the root systems of the plant together with the translocation and bioaccumulation of the whole plant body . Interestingly, more research is highly in need for better understanding the interactions among plants, soil, microbes and the contaminants in order to broaden the successful application of phytoremediation . Therefore, we used this rapid and inexpensive solution to reduce CYP residue in the soil.
There are some factors that affect the efficiency of the phytoremediation of pesticides, such as the KOC and Kow values, while pesticides absorbed by soil particles that often remain in the root zone, where they may be more available for plant uptake and chemical or microbial degradation. However, pesticides that are strongly sorbed to the soil are usually less available for microbial degradation and plant uptake . Turgut  found that the uptake and translocation of organic compounds were dependent on hydrophobicity (lipophilicity), solubility, polarity, molecular weight, plant species and environmental factors. Pesticides that sorb weakly to soil particles are more likely to move through the soil profile with infiltrating water . The uptake of pesticides by plants is governed by both pesticide and plant characteristics . Moreover, Bouldin et al.  recorded that lipophilicity was the most essential characteristic of a chemical to determine its movement within the plant and was associated with the Kow value. Notably, log Kow of pesticides should typically range from 3.0 to 0.5 for optimum uptake. However, pesticides with small log Kow are too hydrophilic to pass through cell membrane, whereas the higher log Kow are hydrophobic and may be strongly adsorbed onto roots . Moreover, the pesticides with high KOC value, the soil strongly is sorbed the pesticide, and the plant difficultly uptake and transport it .
The common broadleaved plantain plant (Plantago major; PM) is a very familiar perennial herb that grows in various places, such as meadowland, roadsides, cultivated fields, canal water, and waste areas . PM has been used as a remediation plant because of the large surface area of its fibrous roots and its phytoremediation ability [27,28,29]. Chekol et al.  mentioned that a large surface area of fibrous roots is related to intensive soil penetration. Terrestrial grasses are most often used in the remediation of organic compounds. In addition, Azmat et al.  observed that roots were important in accumulating compounds due to the direct exposure of toxic chemicals to these underground parts and their ability to transport the compounds to aboveground organs (shoots). Romeh  found that PM has the ability to phytoremediate soil polluted with azoxystrobin. In addition, PM was used in soil treated with Rumex dentatus leaf extract in order to enhance removing carbosulfan from soil . Likewise, PM can take up chlorpyrifos residue from soil by its roots and leaves; therefore, PM can be utilized in reducing the chlorpyrifos amount in soil . Based on the efficiency of this plant, we used it in phytoremediation to remove CYP from contaminated soil.
Combining plants with solubility enhancement surfactants may enhance the effectiveness of phytoremediation. This method depends on the use of a surfactant that increases the water solubility of hydrophobic organic compounds (HOCs) by reducing the surface tension and micellization [33, 34]. This study focused on four surfactants, liquid silicon dioxide (SiO2), Tween 80 (Tw80), liquid humic acid (HA) and hydroxypropyl-β-cyclodextrin (HPβCD). These surfactants can accelerate the process of CYP residue uptake from the soil. This is due to their different mechanisms for increasing the bioavailability of CYP in the soil. Silicon (Si) is considered as one of the most essential elements for numerous plant species . It is the second most abundant element in soil and the Earth’s crust. It also plays an essential role in improving plant resistance to stress, which can be achieved by accumulating silicon in plant parts, including hulls, leaves, stems, and roots . Moreover, the phytoremediation efficiency of Glycine max amended with SiO2 is better than that of Argal in the removal of fenamiphos residue from contaminated soil . Few reports have focused on the role of SiO2 in improving pesticides uptake and the availability in contaminated soil. HPβCD has been anticipated as a non-toxic and biodegradable alternative to surfactants and organic solvents to remove polycyclic aromatic hydrocarbons (PAHs) and other hydrophobic compounds from contaminated soil . Notably, HPβCD has been applied environmentally for enhancing the remediation efficiency of contaminated soils because of its ability to increase the apparent water solubility of low-polar organic compounds, which reduces their sorption and facilitates their transport through soil . Therefore, this surfactant was considered as a good candidate for studying its ability to increase CYP bioavailability in soil to facilitate the phytoremediation process. HA has surfactant-like micelle microstructures which could enhance the organic compounds solubility of organic compounds and potentially increase the removal of hydrophobic organic compounds . HA plays an important role in controlling the bioavailability of HOCs in aquatic environments . Fava and Piccolo  showed that HA could enhance the bioavailability of Polychlorinated biphenyls (PCBs) in contaminated soils. The ability of HA to facilitate the removal of organic pollutants and increase their bioavailability was found in soil . Smith et al.  found that the presence of HA could lead to a direct increase in phenanthrene removal from soil. Tw 80 is non-toxic to soil microorganisms and inert to the soil matrix and has the additional benefit of causing an enhanced dissolution rate for single compounds . Ramamurthy and Memarian  indicated that Tw 80 can enhance the phytoremediation of soils polluted by mixed contaminants. In addition, the addition of the synthetic surfactant Tw 80 enhanced the solubility of endosulfan . Consequently, we used these surfactants to increase the bioavailability of CYP and improve the uptake of CYP from polluted soil by PM.
Therefore, the aim of this study was to investigate the ability of PM to remediate CYP-polluted soil. The use of SiO2 and solubilization surfactants (HPβCD, HA and Tw 80) for improving the bioavailability and uptake of CYP-polluted soil by PM was evaluated as a potential marvellous solution and curative method without high cost for the elimination of CYP pollution from the soil.
Pesticide and surfactants
The reference standard of CYP (99% purity) was purchased from Sigma, China. The physical properties of CYP  are listed in Table 1. After planting, CYP was dissolved in acetone (0.5 mL) to obtain a concentration of 10 µg g−1 . CYP at this concentration was added to the soil in the pots with irrigation water to avoid direct contact between CYP and the plant shoots.
HA, SiO2, Tw80 and HPβCD as surfactants were purchased from Sigma, China. Treatments included the following: 10 mg L−1 HA, 750 mg L−1 SiO2, 9.2 mg L−1 Tw 80 [corresponding to 0.5 critical micelle concentration (CMC)] and 1.0% HPβCD.
Phytoremediation experiment setup and procedures
Under greenhouse conditions, a pot experiment was conducted at the Institute of Pesticide Science, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi Province, China. The experiment was conducted under natural light conditions. The greenhouse temperature and relative humidity were 25–27 °C and 66–69%, respectively. For this experiment, the soil was collected from a plot in Yangling (34°17′2″N, 108°3′50″E), Shaanxi Province, China. The sieved clay loamy soil was air dried (organic matter 18.2 g kg−1, pH 7.3, electric conductivity 2.28 S m−1) then placed in plastic pots. Five hundred grams of soil was transferred to each plastic pot. PM seeds were purchased from a local market (Shangcheng, 31°47′43″N, 115°24′4″E, Henan Province, China). PM seeds were sown during the winter season of 2017/2018; two PM seeds were planted per pot. After germination, the plants were thinned to one plant in each pot. The soil moisture content was adjusted to near the field capacity of the soils before the end of the growing season. The experimental pots were arranged according to a random design that consisted of eight treatments: (1) C: CYP-contaminated sterilized soil (CCSS) without P. major (PM), (2) T1: CYP-contaminated soil (CCS) without PM, (3) T2: CCS with PM only, (4) T3: CCSS with PM only, (5) T4: CCS with PM and amended with SiO2, (6) T5: CCS with PM and amended with HPβCD, (7) T6: CCS with PM and amended with HA, and (8) T7: CCS with PM amended with Tw80. 120 pots were used for all treatments, each treatment has 15 pots for five different times of sample collection, three replicates for each time. In each pot, one plant was grown for 14 days. After 1, 3, 7, 10, and 14 days from the times of exposure, the plants were collected from the treated soil for analysis. Plants were dissected and separated into roots and leaves. The plant roots were washed for three min in running tap water and dried. Ten grams of soil and four grams of roots and leaves were analysed for CYP residues.
According to Romeh and Hendawi , the removal percentage of CYP at the 1, 3, 7, 10 and 14 days of exposure was calculated as:
C0: initial CYP concentration in soil and C1: CYP concentration
In vitro evaluation of surfactant efficacy in CYP adsorption
In vitro experiments were carried out to determine the equilibrium adsorption isotherms of CYP to determine the efficiency of surfactants in terms of CYP uptake from the soil. Four surfactants (HPβCD, SiO2, HA and Tw80) at the same concentrations as previously used in the greenhouse experiment were added to 100 mL glass-stoppered conical flasks, and distilled water was used as a control. Three replicates were used in this experiment. CYP was then added to all of the conical flasks at 10 µg mL−1. The final volume of all solutions was (20 mL) in each flask. One gram of soil was added to all of these solutions and incubated with shaking for 3 h; then, the resulting suspensions were kept at 27 °C for 24 h. The suspensions were centrifuged at 15,000 rpm for 10 min, and the amount of CYP in supernatants were analysed by gas chromatography with an electron capture detector (GC-ECD) to determine the amount of CYP in the supernatants. According to Romeh and Hendawi , the amount of adsorbed CYP was calculated as the difference between the initial concentration of CYP and the concentration at equilibrium:
where x/m is the CYP concentration in the soil (µg g−1), C0 is the initial concentration of CYP (µg mL−1), Ce is the CYP concentration at equilibrium (µg mL−1), V is the solution volume, and W is the soil sample weight.
Determination of CYP residue in the soil and PM
The extraction of CYP residue was carried out by using the QuEChERS (quick, easy, cheap, effective, rugged and safe) method as described by Lehotay et al. . In brief, 10 g of each soil type and 4 g of roots and leaves were placed into a 50-mL centrifuge tube, and then 10 mL acetonitrile with 1% acetic acid was added. The samples were shaken vigorously for one min, and then six g MgSO4, 1.5 g NaCl, and one g sodium citrate tribasic dehydrate (Na3 citrate) were added. Each tube was directly shaken after adding the salt. They were shaken vigorously for one min and then centrifuged for five min at 4000 U min−1. A 1 mL aliquot of supernatant was transferred to a dispersive clean-up tube containing MgSO4, graphitized carbon black (GCB), C18 and primary secondary amine (PSA). These tubes were shaken for 30 s and centrifuged for five min at 4000 U min−1.
The cleaned extract was analysed on a GC-2014C (Shimadzu) containing a capillary column using a Ni63 electron capture detector (ECD) for the detection of CYP. The separation of CYP was performed in a 30 m × 0.25 mm internal diameter, 0.25 µm thickness film submerged in a 5% diphenyl, 95% methylpolysiloxane HP-5MS column. Nitrogen gas was used as a carrier at 9.6 psi pressure and 2 mL min−1 flow. The injector was used at a constant temperature of 280 °C, whereas the detector temperature was 300 °C. In addition, the initial temperature of the oven was 110 °C (for 3 min isothermal) to 275 °C (for 15 min isothermal). The injection volume was 1 µL. The GC method performance was estimated by evaluating some quality parameters, such as the recovery values, limits of quantification (LOQ) and limits of detection (LOD). LOQ and LOD were evaluated according to the following equations described by Thomsen et al. :
where S0 is the calibration line standard deviation and b is the slope.
The linearity was significant with an excellent correlation coefficient of R = 0.998. The LOQ and LOD of CYP were 0.50 µg g−1 and 0.16 µg g−1, respectively. CYP recoveries at different levels of fortification, i.e., 0.05, 0.1 and 0.5 mg kg−1, were estimated from the soil, root and leaf samples. Under the selected conditions, we did not observe any interfering peaks on the sample chromatogram. The average ranges of recoveries for soil, root and leaves were 90.6–90.7%, 89.3–91.2% and 92.6–96.5%, respectively.
The degradation rate (K) and half-life value (t1/2) were estimated according to the following equation reported by Belal and Gomaa ,
In this study, data were entered into the program Costat 6.311 software. Arithmetic mean and standard error were calculated. One-way ANOVA test was performed to compare between different treatments. If the p-value is less than 0.05, we reject the null hypothesis that there is no difference between the means and conclude that a significant difference does exist. If the p-value is less than 0.05, we cannot conclude that a significant difference exists. We performed the one-way ANOVA test by post hoc test using Duncan test to make multiple comparisons between averages of different treatments. The means followed by the same letter in each column are not significantly different from each other at the 5 percent probability level (Duncan’s multiple range test).
Contribution of PM and some factors to increasing the bioavailability of CYP in the soil
Under the different treatments, changes in the levels of CYP in the soil were measured over 1–14 days (Table 2) to determine the ability of PM to remove CYP from the soil and the contributions of the different surfactants to increasing the CYP bioavailability, microorganism abundance, improve PM performance, and amalgamation between PM and microorganisms, which result in CYP degradation in the soil. After 7 days, the percentages of CYP removal in the control group (C) and the other experimental treatments were compared. The results in Table 2 show that the amalgamation between microorganisms and PM (T3 − C) is the most effective treatment for CYP degradation in the soil, improving CYP degradation rates by 20.9% in comparison to the process of natural degradation, followed by the treatments with plants alone (T2 − C) and microorganisms alone (T1 − C), which improved degradation by 16.2 and 13.9%, respectively. The contribution of SiO2 (T4) to CYP uptake from the soil was greater than that of other solubility-enhancing surfactants across all experimental periods (Table 2). Whereas the contribution of T4 to CYP uptake after 7 days was 14.9%, the contributions of T5, T6, and T7 to CYP uptake from the soil were 7.9, 11.7, and 5.4%, respectively. During all experimental periods, the contributions of surfactants to the removal of CYP from the soil were found to be as follows: SiO2 > HPβCD > HA > Tw80.
Dynamics of CYP in soil and plant tissues under different surfactant efficacies
The CYP concentrations in the soil and plant tissues (roots and leaves) during the experiment are shown in Fig. 1. The data obtained during this study showed that all experimental groups containing plants removed a substantial amount of CYP. Amending the soil with PM plus the tested surfactants resulted in a decrease in CYP in the soil and then increased the CYP concentrations in the plant roots and leaves. SiO2 had a synergistic effect on the uptake and translocation of CYP. The phytoremediation efficiency of PM amended with SiO2 was higher than that of the other solubility-enhancing surfactants, with CYP being eliminated from the polluted soil during the experimental period. The most-effective to the least-effective supplements in the order of ability for use in combination with PM for CYP phytoremediation by roots were as follows: SiO2 > HPβCD > HA > Tw80. In the soil with PM, the CYP concentration was in the range of 8.24–3.16 mg kg−1 over the 14 days of the experiment, while it was 9.47–3.84 mg kg−1 in the control soil. The CYP concentrations in the soil containing PM and amended with SiO2, HPβCD, HA and Tw 80 reached 5.21, 5.53, 5.91 and 6.16 mg kg−1, respectively, after 7 days of exposure, while the concentration of CYP in the soil with PM alone was 8.24 mg kg−1. On the 14th day, the CYP concentrations in the soil with PM and the surfactants reached 1.58, 2.05, 2.22 and 2.73 mg kg−1, respectively, while CYP concentration in the control soil was 3.16 mg kg−1, and this difference was significant (p > 0.05) (Fig. 1a). SiO2, HPβCD, HA and Tw80 had a synergistic effect on the uptake and translocation of CYP in the PM roots. Significant accumulation of CYP was observed in the roots (43.6, 40.1, 38.8, and 35.0 mg kg−1), and there was a significant difference in these values (p > 0.05) compared with the concentrations in the PM roots without surfactants (32.7 mg kg−1) at 7 days (Fig. 1b). On the 14th day, there were significant differences in the concentration of CYP in roots when the surfactants were applied (74.8, 71.2, 68.8, and 63.8 mg kg−1, respectively) compared to that when PM was grown alone (62.7 mg kg−1) (p > 0.05). For the leaves, the ratios of uptake and translocation for CYP were significantly different (p > 0.05) in the presence of SiO2, HPβCD, HA and Tw80 in combination with PM at 7 days, with values that were approximately 1.61, 1.49, 1.37 and 1.25 times higher, respectively, than that with PM alone. However, on the 14th day, the ratios were 1.29, 1.25, 1.20 and 1.15 times higher, respectively, than that for PM alone (Fig. 1c).
The total CYP accumulation in the entire plant under amendment with SiO2, HA, HPβCD and Tw 80 reached 66.72, 61.57, 58.52 and 53.03 mg kg−1 within 7 days, while the total accumulation was 47.04 mg kg−1 when PM was grown alone. At 14 days, the total CYP uptakes by PM after amendment with SiO2, HA, HPβCD and Tw 80 reached 125.71, 120.53, 116.37 and 109.19 mg kg−1, respectively, while the total uptake was 102.16 mg kg−1 when PM was grown alone.
Enhancing the recovery of CYP from the soil
A batch equilibrium technique was used to evaluate the ability of the surfactants HPβCD, SiO2, HA and Tw80 to adsorb the CYP from the soil by comparing the solubility-enhancing surfactants and distilled water. As shown in Fig. 2, HPβCD was found to be the most effective in decreasing the adsorption of CYP onto soils when compared with the other surfactants. The desorption of CYP in the soil showed the order HPβCD > SiO2 > HA > Tw80. The amount of CYP adsorbed by HPβCD from polluted soil was 47.5 µg g−1 after 24 h, while SiO2, HA and Tw80 adsorbed only 30.6, 22.5 and 13.6 µg g−1, respectively, with significant difference (p > 0.05) compared to the amount adsorbed by the soil (72.1 µg g−1).
Reaction rate constants for CYP
The removal of CYP from soil can be adequately described by a first-order reaction. According to the results shown in Fig. 3, the residual half-life values (t1/2) of CYP for all treatments were as follows: CCSS > CCSS + PM> CCS > CCS + PM> CCS + PM + Tw80 > CCS + PM + HPβCD > CCS + PM + HA > CCS + PM + SiO2.
Phytoremediation is an effective bioremediation technique which has been widely exploited to remediate various pesticide contaminants, including those in [53,54,55]. Many studies reported that microbial-plant interactions are highly effective in pesticides remediation [56,57,58]. Our results (Table 2) showed that the combination of PM (T3 − C) and microorganisms were the best treatment for CYP degradation in soil. Phytoremediation is seemed to be improved by degradation processes resulting from the combined effects of microorganisms and plant in the rhizosphere . This result confirms the work of Gurska et al. and Chen et al. [60, 61], who reported that microbial phytoremediation offers enormous potential for the remediation of soils that are contaminated by organic pollutants. In addition, pollutant-degrading bacteria might trigger adaptation in plants towards contaminants to detoxify polluted soils through direct mineralization of the organic contaminants . Moreover, plant exudates have an effective role in increasing the activity and density of potential pollutant-degrading bacteria around plant roots . In addition, plant root exudates can accelerate the bioremediation process of contaminants through stimulating growth and metabolism of the rhizospheric microorganisms . For instance, Plant–microbe associations between Withania somnifera and microorganisms can enhance the uptake of lindane .
Based on the results of this study, PM has the ability to take CYP up from the soil and plays a prominent role in increasing the removal of CYP from the soil. This ability is demonstrated because this plant not only has a large surface area of fibrous roots, which are often used in the remediation of organic compounds [30, 31] but also the presence of bioactive compounds called polyphenolic compounds. These compounds have free radical scavenging ability via the presence of metal ion chelators and by naturalizing dangerous reactive oxidants . Hence, it is a good plant for phytoremediation (Fig. 1, Table 2). These results are in agreement with Romeh , who demonstrated that PM is able to take up imidacloprid from the soil by roots and then leaves, so PM may be used for reducing pollution by imidacloprid in the soil. Likewise, PM was better than Glycine max and Helianthus annuus in decreasing azoxystrobin in contaminated soil . Moreover, Mahmoud  reported that PM efficiently removed diazinon, pymetrozine and fipronil residue from soil and has the potential for use in pesticide phytoremediation. Consequently, this indicates that PM may play a major role in the removal of pesticides from contaminated soil. However, a plausible explanation for this finding is still required.
Amending soil with PM plus SiO2 resulted in a decrease in CYP in the soil at a rate of 30.8–84.2% from 1 to 14 days of exposure and increases in plant leaves and roots (Fig. 1, Table 2). This effect was demonstrated by the high adsorptive capacity of the form of silicic acid ions in the soil solution, resulting in complex formation with compounds in the soil and competition with other ions to link with the sites of adsorption . In addition, the increased CYP uptake by PM together with SiO2 might have occurred because of the interaction among the plants, SiO2, and microbes, which could improve plant vigour and growth . In addition, Si affects the binding of organic compounds to soil particles, making them more available for plant uptake . Furthermore, SiO2 can cross membranes in response to a concentration differential. During its absorption and transport, SiO2 often interacts with the organic compounds (CYP) and other inorganic elements, enabling them to take part in various biochemical reactions within plant cells . This process allows the plants to adsorb organic constituents from the soil, which is needed to facilitate phytoremediation. This result was obtained previously by Schaller et al. , who found that Si improved nutrient uptake capability, thereby improving soil fertility. In addition, Romeh and Hendawi  reported that the combination of Glycine max plus SiO2 was better than other solubility-enhancing surfactants (Argal) for reducing the level of fenamiphos in soil. However, the function of SiO2 in terms of enhancing the phytoremediation of soil polluted with pesticides is still required.
Numerous results have shown that HPβCD enhances soil desorption of different pesticides from soil [71,72,73]. HPβCD along with PM may serve as an enhancing agent for the phytoremediation of soil contaminated with CYP, whereas the rate of CYP removal from the soil was 27.7–79.5% throughout the experimental period (Fig. 1, Table 2). This may be because HPβCD is capable of complex formation with both solid and solution states with an assortment of molecules, which are placed in their hydrophobic interior cavity . This result is a similar to that found by Mohamed et al. , who reported that HPβCD, a type of solubility-enhancing surfactant, has various properties that are used for the remediation of soil contaminated with pesticides. Likewise, the application of HPβCD to Point Pelee National Park (PPNP) soils improved microbial activity for the degradation of DDT and increased DDT phytoremediation by native grasses (Panicum virgatum and Schizachyrium scoparium) . In addition, inclusion complexes of the hydrophobic herbicide bensulfuron-methyl (BSM) with HPβCD were prepared and characterized, and a phase solubility study showed that HPβCD increased the solubility of BSM . Furthermore, Villaverde et al.  found that HPβCD could increase desorption of the herbicide norflurazon from soils. Moreover, HPβCD clearly shows an increase in the rate of mineralization of diuron in contaminated soils and a dissipation of half life time (DT50) values due to its increasing bioavailability . In addition, the formation of inclusion complexes between norflurazon and HPβCD provides the possibility of using HPβCD to remove herbicides, such as norflurazon, or other toxic substances from contaminated soils . Moreover, the addition of HPβCD increased PCB bioavailability leading to enhanced PCB removal and plant uptake . Furthermore, HPβCD can contribute to an improvement in the effectiveness of terbuthylazine in terms of its bioavailability in soil . Fluorene and fluoranthene were removed from contaminated soils by HPβCD . The results indicate the potential use of HPβCD for the remediation of pesticide-contaminated soils.
On the other hand, HA along with PM enhanced CYP removal with a rate of 22.6–77.8% throughout the experimental period (Fig. 1, Table 2). This enhancement might be due to HA being able to bind to compounds and change their speciation forms in soils . Moreover, it can form metal complexes, isolate organic compounds, reduce and oxidize elements to and from toxic forms, photosensitize chemical reactions, and improve the uptake of toxic compounds by plants and microbial organisms . These results are in agreement with those of Conte et al. , who found that the addition of HA increased the bioavailability of hydrophobic organic compounds (HOCs) in contaminated soils. Furthermore, the surfactant activity of HA was found to decrease the adsorption of organic contaminants from soils, thereby enabling desorption of PAH . Moreover, Piccolo et al.  explained that HA can increase the bioavailability of atrazine in the soil. In addition, HA can reduce excessive soil contamination in aged industrially polluted soils . Consequently, natural HA solutions may be a good option for surfactant-enhanced desorption in contaminated soils .
With regard to Tw80, several studies have shown that Tw80 plays a salient role in improving pesticide adsorption [88,89,90]. Based on the results of this study, Tw80 helped PM in the degradation of CYP from the soil at a rate of 20.2–72.7% from 1 to 14 days of exposure (Fig. 1, Table 2). This effect may be hypothesized to occur because CYP desorption by Tw80 in the soil may be dependent on the concentration of the surfactant, with an optimal concentration of approximately 0.5 CMC . This result is consistent with the previous report by Gao et al. , who reported that Tw80 can remove organic pollutants from contaminated soils via a mechanism involving the repartition of pollutants into micellar phases of the surfactant formed in water. However, this process would take place only when the surfactant solution reaches the surfaces of soil particles and pollutants may be desorbed into the micellar phases. Moreover, Tw 80 has been used to increase the bioavailability of the diazinon and dimethoate from the soil . Furthermore, Romeh  found that Tw80 in the presence of PM could act as an enhancing surfactant for reducing the amount of azoxystrobin in polluted soil. In addition, the presence of Tw80 can enhance the transfer of mefenacet from the soil phase to the aqueous phase . The surfactant Tw80 is a mobilizing agent for pollutants that facilitates their desorption from the soil matrix .
In equilibrium adsorption isotherms, HPβCD was better than the other surfactants (SiO2, HA, Tw80) in terms of the recovery of CYP from the soil. HPβCD decreased the adsorption of CYP onto soils (Fig. 2). This effect may be because of the formation of inclusion complexes with CYP with a higher solubility in water than that of CYP and thus with a greater inclination to remain in solution as a complex than to be adsorbed onto the soil . Through in vitro experiments, a batch equilibrium technique demonstrated that the use of HPßCD led to efficient CYP elimination from the soil. However, in the greenhouse experiment, PM took up a higher amount of CYP in the presence of SiO2. This result may be due to the interaction among microorganisms, SiO2, and PM, which improves plant growth and activity and increases the uptake of compounds by plants . In addition, Ma and Yamaji  found that these beneficial effects of Si were attributed to both Si deposited in various tissues and soluble Si. The high deposition of Si in tissue causes the formation of a physical barrier that enhances the strength and rigidity of the tissues.
On the basis of our results (Fig. 3), PM cannot degrade CYP but can only take CYP up from the soil, but soil microbes do play a salient role in CYP degradation. The longest half-life value (t1/2) of CYP was in the sterilized soil (24.8 days), and the shortest was in the soil amended with SiO2 (6.41 days). This may be due to the microbial degradation mechanism, which is summarized in three parts . First, the target was adsorption; it passed onto the cell membrane surface and was a dynamic balance process that was also critical. Second, the target penetrated the cell membrane surface, and the efficiency and penetration rate were linked with the target isomer molecular structure. Finally, this target rapidly undergoes enzymatic reactions in the membrane. This result was obtained previously by Demoute , who noted that soil microbes play an effective role in the dissipation of CYP in the soil. Similarly, Akbar et al.  reported that the half-life (T1/2) values for CYP degradation by microbes in these soil treatments were 9–17 days.
Based upon the present study, it can be concluded that
Plantago major is able to remove cypermethrin from the soil by its roots and then its leaves, so Plantago major may be used a curative model for reducing the level of cypermethrin in the soil.
Hydroxypropyl-β-cyclodextrin, liquid humic acid, liquid silicon dioxide and Tween 80 can act as surfactants for improving the phytoremediation of CYP from polluted soil, and liquid silica is the most effective surfactant in removing cypermethrin from the soil.
Availability of data and materials
The datasets obtained and analysed in the current study are available from the corresponding author on reasonable request.
CYP-contaminated sterilized soil
- SiO2 :
liquid silicon dioxide
liquid humic acid
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The authors would like to express their thanks to Prof. Dr. Ali A. Aioub from the Faculty of Agriculture, Zagazig University, Egypt for his fruitful discussion. This study was supported by grants from the National Key Research and Development Program of China (2017 YFD0201402), from the Science and Technology Ministry of China and the National Natural Science Foundation of China (31672055), as well as the China Scholarship Council (CSC).
This study was supported by grants from the National Key Research and Development Program of China (2017 YFD0201402), from the Science and Technology Ministry of China and the National Natural Science Foundation of China (31672055) as well as the China Scholarship Council (CSC).
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Aioub, A.A.A., Li, Y., Qie, X. et al. Reduction of soil contamination by cypermethrin residues using phytoremediation with Plantago major and some surfactants. Environ Sci Eur 31, 26 (2019). https://doi.org/10.1186/s12302-019-0210-4
- Soil polluted
- Plant uptake
- Solubility enhancing agents