Yang Huayun, Li Weidong, Liu Qi
Qianjiang College of Hangzhou Normal University, Hangzhou, 310012, China.
College of Life and Environmental Science, Hangzhou Normal University, Hangzhou, 310012, China.
Bull Environ Contam Toxicol. 2017 Sep;99(3):350-353. doi: 10.1007/s00128-017-2131-5. Epub 2017 Jun 22.
This study investigated the enantiomeric and depth profiles of organochlorine pesticides (OCPs) accumulated in the sediments of Qiandao Lake, China. OCP concentrations in sediments have increased gradually since the early 1960s, when extensive OCPs application in China began. Concentrations reached maximum levels after 1992, this timing corresponds with the emerging of the "new" usage of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethane (DDTs). In addition, the degradation of chiral OCPs were enantioselective, resulting in enriched (-)-enantiomers for α-HCH and o, p'-DDD. However, both preferential depletions of (-) enantiomers and (+) enantiomers were observed for o, p'-DDT. This outcome was indicated by enantiomer fractions (EF) values either greater or less than 0.5.
本研究调查了中国千岛湖沉积物中积累的有机氯农药（OCPs）的对映体和深度分布情况。自20世纪60年代初中国开始广泛使用OCPs以来，沉积物中的OCP浓度逐渐增加。1992年后浓度达到最高水平，这一时期与六氯环己烷（HCHs）和二氯二苯三氯乙烷（DDTs）“新”用途的出现相对应。此外，手性OCPs的降解具有对映体选择性，导致α-HCH和o,p'-DDD的（-）-对映体富集。然而，对于o,p'-DDT，观察到（-）对映体和（+）对映体均有优先消耗。对映体分数（EF）值大于或小于0.5表明了这一结果。
