Joint acute toxicity of diazinon and chlorpyrifos to ceriodaphnia dubia

摘要

Dizainon and chlorpyrifos are two organophosphorous pesticides widely found in municipal, agricultural, and urban storm water discharges. Because they are often found concurrently, their relationship with respect to joint toxicity is of interest, particularly in regard to interpreting the results of toxicity identification evaluations (TIEs) that point to metabolically activated organophosphorous pesticide(s) as causes of toxicity. Joint toxicity was evaluated using static tests that incorporated 48- to 96-h exposure periods using laboratory water, natural water, and urban storm water.