在中国江苏省北部的棉田中，三氯杀螨醇的施用导致了高浓度滴滴涕残留。
Dicofol application resulted in high DDTs residue in cotton fields from northern Jiangsu province, China.
作者信息
Yang Xinglun, Wang Shisheng, Bian Yongrong, Chen Feng, Yu Guifen, Gu Chenggang, Jiang Xin
机构信息
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
出版信息
J Hazard Mater. 2008 Jan 15;150(1):92-8. doi: 10.1016/j.jhazmat.2007.04.076. Epub 2007 Apr 21.
Dicofol with high impurity of DDT compounds is still widely used in agricultural practice such as cotton cultivation and becomes an important source of DDT pollution in China. In this study, investigations on the DDT residues in cotton fields from northern Jiangsu province, China were conducted. The results showed that DDTs in cotton soil were much higher than other mode of land use. The DDTs levels ranged from 4.2 to 678.6 ngg(-1), with a mean concentration of 190.4 ngg(-1), of which the most abundant compounds were p,p'-DDE (mean of 129.38 ngg(-1)), p,p'-DDT (mean of 26.57 ngg(-1)) and o,p'-DDT (mean of 16.92 ngg(-1)). The concentrations of o,p'-DDT and o,p'-DDE were significantly higher (p<0.05) in topsoil (0-10 cm) than in subsoil (10-20 cm), while other DDT compounds were not. Source apportionment showed that dicofol-type DDT accounted for up to 80% of the DDTs residue. All the results indicated that dicofol applications resulted in serious DDT pollution in cotton fields. Our work provided implications for reasons why there was no apparent decrease of DDT level in China.
含有高浓度滴滴涕（DDT）化合物杂质的三氯杀螨醇仍广泛应用于棉花种植等农业生产实践中，成为中国DDT污染的一个重要来源。本研究对中国江苏省北部棉田的DDT残留情况进行了调查。结果表明，棉田土壤中的DDT含量远高于其他土地利用方式。DDT含量范围为4.2至678.6 ng g⁻¹，平均浓度为190.4 ng g⁻¹，其中含量最高的化合物是p,p'-DDE（平均含量为129.38 ng g⁻¹）、p,p'-DDT（平均含量为26.57 ng g⁻¹）和o,p'-DDT（平均含量为16.92 ng g⁻¹）。表层土壤（0 - 10厘米）中o,p'-DDT和o,p'-DDE的浓度显著高于下层土壤（10 - 20厘米）（p < 0.05），而其他DDT化合物则不然。来源分析表明，三氯杀螨醇型DDT占DDT残留量的80%。所有结果表明，三氯杀螨醇的使用导致了棉田严重的DDT污染。我们的工作为中国DDT水平没有明显下降的原因提供了启示。
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