Using the o,p'-DDT/p,p'-DDT ratio to identify DDT sources in China.
Using the o,p'-DDT/p,p'-DDT ratio to identify DDT sources in China.
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DOI：
10.1016/j.chemosphere.2010.08.049
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发表时间：
2010-11
期刊：
影响因子：
8.8
通讯作者：
Xinghua Qiu;T. Zhu
中科院分区：
文献类型：
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作者：
Xinghua Qiu;T. Zhu
中国已禁用滴滴涕数十年，但在中国环境中仍检测到高浓度的滴滴涕。这可能至少部分是由于目前使用的三氯杀螨醇制剂含有滴滴涕杂质。本研究建立了一种基于o，p′-DDT和p，p′-DDT两种DDT异构体比例的方法，并利用该方法估算了三氯杀螨醇制剂和技术滴滴涕对环境中滴滴涕总量的相对贡献。基于该方法和文献中的现场数据，计算出2004年中国太湖地区三氯杀螨醇制剂对大气DDT的贡献率>72%，而在夏季三氯杀螨醇用于农业用途时，该值>84%。然而，沉积物和土壤中的残留滴滴涕大多来自历史上使用的技术滴滴涕。在中国的大多数其他地区，我们发现三氯杀螨醇是空气样本中滴滴涕的重要组成部分。
Dichlorodiphenyltrichloroethane (DDT) has been banned in China for decades, and yet high DDT concentrations are still being detected in the Chinese environment. This might be at least partly due to the current use of dicofol formulation, which contains DDT as an impurity. In this study, a method based on the ratios of two DDT isomers, o,p′-DDT and p,p′-DDT, was established and used to estimate the relative contributions of dicofol formulation and those of technical DDT to overall environmental DDT. Based on this method and field data from the literature, we calculated that dicofol formulation contributed >72% of atmospheric DDT in 2004 in the Taihu Lake region, China, and this value was >84% in summer when dicofol was applied for agricultural purposes. Sediment and soil, however, contained mostly residual DDT from the historical use of technical DDT. In most other regions of China, we found that dicofol contributed to a significant fraction of DDT in air samples.