Cai Wei-Dan, Liu Hui-Jun, Fang Zhi-Guo
College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
Huan Jing Ke Xue. 2012 Feb;33(2):448-53.
The enantioselective toxicity of the chiral herbicides Rac- and S-metolachlor to Scenedesmus obliquus and Chlorella vulgaris was determined, and the effect of humic acid was studied by using acute toxicity testing method. The results indicated that the toxicity of Rac- and S-metolachlor increased with increasing concentration and exposure time. The EC(50, 96 h) ratio of Rac-metolachlor to S-metolachlor was 2.25 for C. vulgaris and 1.81 for S. obliquus, indicating that S-metolachlor had higher effect on two algaes, and S. obliquus was more sensitive to Rac- and S-metolachlor. Linear correlation between toxicity on S. obliquus and C. vulgaris was observed. The toxicity of Rac- and S-metolachlor changed with humic acid, with more significant change was observed in S-metolachlor (P<0.05).
采用急性毒性试验方法，测定了手性除草剂消旋甲草胺和S-甲草胺对斜生栅藻和普通小球藻的对映体选择性毒性，并研究了腐殖酸的影响。结果表明，消旋甲草胺和S-甲草胺的毒性随浓度和暴露时间的增加而增加。对于普通小球藻，消旋甲草胺与S-甲草胺的EC(50, 96 h)比值为2.25，对于斜生栅藻为1.81，表明S-甲草胺对两种藻类的影响更大，且斜生栅藻对消旋甲草胺和S-甲草胺更敏感。观察到对斜生栅藻和普通小球藻的毒性之间存在线性相关性。消旋甲草胺和S-甲草胺的毒性随腐殖酸而变化，其中S-甲草胺的变化更显著(P<0.05)。
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