dc.description.abstract |
Past research has shown that selective enzymatic degradation of enantiomers by
microorganisms does occur. This work was done to determine the enantiomeric ratios
and concentrations of several chiral organochlorine pesticides in soils from across Ohio.
Quantitative analysis was done using gas chromatography with electron capture detection
using a DB-5 column. Concentrations were determined for nine compounds (o,p'-DDT,
p,p'-DDT, p,p'-DDD, p,p'-DDE, cis-chlordane, trans-chlordane, heptachlor epoxide,
dieldrin and trans-nonachlor) in eleven agricultural soils and one garden soil. The
components of DDT were the only compounds present in all soils analyzed. The garden
soil concentration values were similar to those for the agricultural soils. Enantiomeric
analysis was done using gas chromatography-mass spectrometry with chiral-phase
capillary columns. Enantiomeric excesses were found for five compounds: o,p'-DDT,
cis-chlordane, trans-chlordane, oxychlordane and heptachlor epoxide. The largest
excesses were seen for heptachlor epoxide. The garden soil showed enantiomeric
differences for trans-chlordane, cis-chlordane and heptachlor epoxide. |
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