International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), Zhejiang University of Technology, Hangzhou 310014, China.
J Agric Food Chem. 2012 Mar 28;60(12):2982-8. doi: 10.1021/jf204921x. Epub 2012 Mar 19.
Studies on residues of currently and never used organochlorine pesticides (OCPs) facilitate the assessment of the contamination level, distribution, sources, transportation, and trend of these selected OCPs in China. In this work we investigated the concentration levels of endosulfans and chlordane, which are currently used, and the never used aldrin and dieldrin in the province of Zhejiang, a rainy, and hilly tea-growing province in eastern China. The average/mean residue levels of OCPs was in the order ∑endosulfan > ∑chlordane > aldrin > dieldrin. The residue level was in good agreement with the usage of OCPs in Zhejiang. The spatial distribution showed that the residues of OCPs in soils from the mountain area were always higher than those in soils from the plains. The distribution characteristics were related to usage for current-use OCPs and temperature for never used OCPs. The isomeric ratios and enantiomeric fractions are useful tools to identify the degradation preference of contaminants. The wide range of ratios between trans-chlordane (TC) and cis-chlordane (CC) indicated that the degradation of the two isomers of chlordane was different at different sites. Nonracemic residues of TC and CC were observed in most soils; this is significant since the enantiomers have different toxicities.
目前和从未使用过的有机氯农药（OCPs）的残留研究有助于评估这些选定 OCPs 在我国的污染水平、分布、来源、迁移和趋势。在这项工作中，我们调查了浙江省内目前使用的硫丹和氯丹，以及从未使用过的艾氏剂和狄氏剂的浓度水平。OCPs 的平均残留水平顺序为：∑硫丹>∑氯丹>艾氏剂>狄氏剂。残留水平与浙江省 OCPs 的使用情况非常吻合。空间分布表明，山区土壤中 OCPs 的残留量始终高于平原土壤。分布特征与当前使用的 OCPs 的使用情况以及未使用的 OCPs 的温度有关。对映体比率和对映体分数是识别污染物降解偏好的有用工具。反式氯丹（TC）和顺式氯丹（CC）之间的比值范围很广，这表明氯丹的两种异构体在不同地点的降解情况不同。在大多数土壤中观察到 TC 和 CC 的非对映体残留；这很重要，因为对映体的毒性不同。
