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Enantiomeric composition of Chiral pesticides in soil and air from the U.S. cornbelt region
| Title: | Enantiomeric composition of Chiral pesticides in soil and air from the U.S. cornbelt region |
| Author: | Leone, Andrea D. |
| Description: | Past research has shown that selective enzymatic degradation of enantiomers by microorganisms does occur. This work was done to determine if enantiomeric ratios can be used to distinguish biotic from abiotic sources of pesticide degradation. Concentrations and enantiomeric ratios were determined for several chiral organochlorine pesticides in soils and air from the cornbelt region. Concentrations were determined for eleven compounds (o.p.’-DDT, p,p’-DDT, p,p’-DDD, p,p’-DDE, dieldrin, trans-chlordane, cischlordane, trans-nonachlor, heptachlor, heptachlor epoxide, and ahexachlorocyclohexane) in 28 agricultural soils and one garden soil. The DDT compounds were found in the most samples and had the highest concentrations of all the compounds analyzed in the soil. Enantiomeric excesses were found for five compounds: o,p’-DDT, trans-chlordane, cis-chlordane, oxychlordane, and heptachlor epoxide, with the largest excesses for heptachlor epoxide. Six air samples were taken directly above agricultural soils, and enantiomeric patterns in air-above-soil samples mimicked the soils both in direction and relative magnitude of degradation. Seven ambient air samples were taken which showed the same general trends of enantiomeric degradation as soil and air-above-soil samples, although not as pronounced. Twenty-three indoor air samples were taken and concentrations determined for all eleven compounds as well as aldrin. Enantiomeric patterns were determined for three compounds, trans-chlordane, cis-chlordane and α-hexachlorocyclohexane. Most of these values were racemic or very close to racemic. Enantiomeric analysis can be useful for distinguishing sources of pesticides to the atmosphere. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=ysu997192215
http://hdl.handle.net/2374.OX/3126 |
| Date: | 1998 |
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