Species sensitivity analysis of heavy metals to freshwater organisms

摘要: Acute toxicity data of six heavy metals [Cu, Hg, Cd, Cr(VI), Pb, Zn] to aquatic organisms were collected and screened. Species sensitivity distributions (SSD) curves vertebrate invertebrate constructed by log-logistic model separately. The comprehensive comparisons the sensitivities different trophic species typical performed. results indicated taxa each metal exhibited higher than vertebrates. However, with respect same species, Cu had most adverse effect on vertebrate, followed Zn Cr. When datasets from all included, Hg still more toxic others. In particular, toxicities Pb fish complicated as SSD intersected those other metals, while total no longer crossed hazardous concentrations for 5 % (HC5) affected derived determine concentration protecting 95 species. HC5 values in descending order: > Cr Cd Cu, indicating opposite order. Moreover, potential fractions calculated assess ecological risks at certain selected metals. Evaluations various levels analysis are necessary prior derivation water quality criteria further environmental protection.