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| Acute toxicity difference of metolachlor and its S-isomer on earthworms. |
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Abstract The acute lethal effect of metolachlor and its S-isomer on earthworms with the chiral difference was analyzed by using the methods of standard OECD filter paper test, artificial soil test and natural soil test. The confidence interval of filter paper toxicity test was the widest and therefore the method was not so reliable. The acute toxicity of Rac- metolachlor and S-isomer on earthworms in the natural soil test was larger than that in the artificial soil test. According to the classification criteria of the toxic chemicals, Rac-metolachlor and S-isomer should belonged to the low poisonous pesticides. There were little differences in LC50 of Rac-metolachlor and S-isomer on earthworms, which showed that the chiral difference of the two pesticides on the acute toxicity of earthworms was insignificant.
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Received: 04 January 2009
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