为了评价土壤重金属污染的生态毒理学效应,根据OECD(经济合作与发展组织)试验指南,研究了人工土壤中Pb、Cd、Cr暴露下赤子爱胜蚓(Eisenia fetida)的回避行为和急性毒性.回避试验结果表明:赤子爱胜蚓产生完全回避反应的土壤w(Pb)、w(Cd)、w(Cr)分别为2 000、120、120 mg/kg.急性毒性试验的结果表明,土壤Pb、Cd、Cr对赤子爱胜蚓14 d LD50(半数致死浓度)的分别为2 526.05、362.83、229.44 mg/kg.在检测Pb、Cd和Cr污染土壤时,赤子爱胜蚓回避试验的灵敏度要高于急性毒性试验.该研究结果揭示出,赤子爱胜蚓的回避行为指标能够成为土壤生态系统风险评价和毒性效应研究的生物标志物预警指标.
【英文摘要】
Avoidance behavior and acute toxicity of Eisenia fetida under exposures to lead,cadmium and chromium in soil were studied based on the test method recommended by the test guide for soil ecotoxicity evaluation announced by the Organization for Economic Cooperation and Development. The earthworm avoidance test results under exposures to lead,cadmium and chromium showed that the total avoidance effect thresholds were 2000,120 and 120 mg/kg respectively. The acute toxicity results showed that 14 d LD50were2526....