Toxicity of chlorpyrifos adsorbed on humic colloids to larval walleye (Stizostedion vitreum)

被引:16
作者
Phillips, TA
Summerfelt, RC
Wu, J
Laird, DA
机构
[1] Iowa State Univ, Dept Anim Ecol, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Agron, Ames, IA 50011 USA
[3] USDA ARS, Natl Soil Tilth Lab, Ames, IA 50011 USA
关键词
D O I
10.1007/s00244-002-0066-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
After application, organophosphorus insecticides (OPs) are often strongly adsorbed to soil constituents. Because of their relatively low water solubility, OPs may be transferred from field to stream adsorbed on suspended solids. However, we are not aware of research done to evaluate the bioavailability (i.e., toxicity) of OPs transported on suspended solids to fish. We conducted 48-h static toxicity tests to determine the toxicity of chlorpyrifos in aqueous solution and adsorbed on calcium-saturated humic acid (HA) to three larval stages of walleye (Stizostedion vitreum). Three concentrations of chlorpyrifos adsorbed on HA, a HA control, and a chlorpyrifos-only treatment were tested. Fish that survived the 48-h static toxicity tests were analyzed to determine total cholinesterase (ChE) activity. In general, survival of all larval stages of walleye exposed to chlorpyrifos-HA complexes was less than that of walleye exposed to HA controls and the chlorpyrifos-only treatment, which were not toxic to walleye. Cholinesterase inhibition of larval walleye exposed to chlorpyrifos-HA complexes was similar to the ChE inhibition observed in larval walleye exposed to chlorpyrifos in the aqueous phase. These laboratory experiments indicate potential toxicity of chlorpyrifos-soil complexes to larval fish.
引用
收藏
页码:258 / 263
页数:6
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