An application of a decision tree for assessing effects from exposures to multiple substances to the assessment of human and ecological effects from combined exposures to chemicals observed in surface waters and waste water effluents

Environmental Sciences Europe

Table 1 Summary of the characteristics of the 559 mixtures included in the seven datasets

	Datasets
Dataset name	CH 1-1	CH 1-2	CH 2-1	CH 2-2	JRC	UK CIP	EA river
Number of samples	74	10	24	9	122	120	200
Number of analytes	21	123	63	24	35	47	40
Number of analytes detected in more than one sample	21	69	45	21	35	46	40
With human toxicity data	21	69	45	21	35	34*	36
With ecotoxicity data	16	39	37	20	35	39*	40
Analytes never detected	0	54	18	3	0	1	0
With human toxicity data	-	54	18	3	-	1	-
With ecotoxicity data	-	37	8	1	-	1	-
Number of substances detected in samples
Lowest number of substances detected in a sample	2	55	6	4	4	16	12
Highest number of substances detected in a sample	20	69	32	19	35	42	30
Average number of substance detected in a sample	15.3	62.6	24.1	12.6	22	27.5	20.4

* Seven of the missing standards are for common ions (sodium, magnesium, chloride, orthophosphate, sulphate, potassium, and calcium) that are of low concern for human health and ecological effects.