Emission of Chiral Organochlorine Pesticides from Agricultural Soils in the Cornbelt Region of the U.S.

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• 作者：Andi D. Leone ; Sam Amato ; and Renee L. Falconer
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：December 1, 2001
• 年：2001
• 卷：35
• 期：23
• 页码：4592 - 4596
• 全文大小：95K
• 年卷期：v.35,no.23(December 1, 2001)
• ISSN：1520-5851

文摘

Several organochlorine pesticides are chiral moleculesmanufactured as racemic mixtures. Past research has shownthat selective degradation of pesticide enantiomers bymicroorganisms occurs resulting in nonracemic signaturesin soils. In this work, volatilization of chiral pesticidesfrom soil was investigated to determine if enantioselectivebreakdown in soils could be used as a source signatureto track releases of chiral pesticides to the atmosphere. Airsamples were taken directly above agricultural soils atseveral sites, and enantiomeric signatures were found tobe nonracemic following patterns found in the soil. A followup study at one site showed that for most compoundsconcentration decreased with increasing height above thesoil, while enantiomer fractions for chiral pesticideswere similar to that found in the soil, signifying the soilas a source to the air. The enantiomer fractions of ambientair samples from rural nonagricultural areas in theregion were also found to be nonracemic.