Emission of chiral organochlorine pesticides from agricultural soils in the cornbelt region of the U.S
| Autor: | Renee L. Falconer, Andi D. Leone, Sam Amato |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Air Pollutants
Insecticides Volatilisation Chemistry Microorganism Air pollution Enantioselective synthesis Agriculture General Chemistry Pesticide medicine.disease_cause complex mixtures Zea mays United States Environmental chemistry Soil water medicine Hydrocarbons Chlorinated Environmental Chemistry Soil Pollutants Enantiomer Volatilization Environmental Monitoring |
| Zdroj: | Environmental sciencetechnology. 35(23) |
| ISSN: | 0013-936X |
| Popis: | Several organochlorine pesticides are chiral molecules manufactured as racemic mixtures. Past research has shown that selective degradation of pesticide enantiomers by microorganisms occurs resulting in nonracemic signatures in soils. In this work, volatilization of chiral pesticides from soil was investigated to determine if enantioselective breakdown in soils could be used as a source signature to track releases of chiral pesticides to the atmosphere. Air samples were taken directly above agricultural soils at several sites, and enantiomeric signatures were found to be nonracemic following patterns found in the soil. A follow up study at one site showed that for most compounds concentration decreased with increasing height above the soil, while enantiomer fractions for chiral pesticides were similar to that found in the soil, signifying the soil as a source to the air. The enantiomer fractions of ambient air samples from rural nonagricultural areas in the region were also found to be nonracemic. |
| Databáze: | OpenAIRE |
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