Environmental Sciences Europe

Table 3 Annual average activities and standard deviations of estrogenic, anti-estrogenic and dioxin-like activities and EC₅₀ in the microtox assay referring to the REF for baseline toxicity of water samples

From: Detection of chemically induced ecotoxicological effects in rivers of the Nidda catchment (Hessen, Germany) and development of an ecotoxicological, Water Framework Directive–compliant assessment system

River	Water sample
River	YES [EEQ ng/L]	YAES [OHT-EQ mg/L]	YDS [β-NF-EQ µg/L]	Microtox [EC₅₀ REF]
Nidda
N1	0.111 ± 0.069	1.24 ± 0.802	< 0.321	750 ± 0
N2	0.208 ± 0.241	1.27 ± 0.802	0.602 ± 0.364	644 ± 213
N3	0.163 ± 0.155	1.34 ± 0.818	0.467 ± 0.410	750 ± 0
N4	0.185 ± 0.198	1.55 ± 0.994	0.626 ± 0.229	511 ± 278
Usa
U1	< 0.073	< 0.400	0.418 ± 0.301	750 ± 0
U2	< 0.073	< 0.400	0.419 ± 0.311	661 ± 179
U3	< 0.073	< 0.400	0.357 ± 0.511	593 ± 315
U4	0.131 ± 0.075	8.00 ± 7.17	0.533 ± 0.358	530 ± 254
Horloff
H1	< 0.073	< 0.400	< 0.321	370 ± 335
H2	< 0.073	< 0.400	< 0.321	598 ± 263
H3	0.157 ± 0.031	< 0.400	0.453 ± 0.078	428 ± 301
H4	< 0.073	< 0.400	0.453 ± 0.080	533 ± 194

For non-toxic water samples in the microtox assay the EC₅₀ threshold value is 750 REF

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