Soil as a source of atmospheric heptachlor epoxide
1998 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 32, no 10, 1546-1548 p.Article in journal (Refereed) Published
The chiral pesticide heptachlor can undergo photolysis to yield the racemic products heptachlor-exo-epoxide (HEPX) and photoheptachlor. Heptachlor is also metabolized to nonracemic HEPX in biological systems and soils. HEPX in ambient air samples from the southern United States and Lakes Ontario and Superior was nonracemic and enriched in the (+) enantiomer. Average enantiomer ratios (ER = areas of (+)/(-) HEPX) in these locations ranged from 1.51 to 2.02, and were similar to ER values of HEPX reported for agricultural soils. Airborne heptachlor was racemic, with ERs of 0.98-1.02. These results suggest that the main source of HEPX in ambient air is not photolysis of heptachlor, hut rather metabolism of heptachlor in soils followed by volatilization of HEPX. The study exemplifies the use of chiral analysis for investigating the environmental fate of pesticides.
Place, publisher, year, edition, pages
1998. Vol. 32, no 10, 1546-1548 p.
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:umu:diva-5450DOI: 10.1021/es971110hISI: 000073648700028OAI: oai:DiVA.org:umu-5450DiVA: diva2:144965