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Half lives of Gaseous Organochlorine Pesticides in Atmosphere  

Choi, Min-Kyu (Marine Environment Research Team, National Fisheries Research & Development Institute)
Chun, Man-Young (Department of Environmental Engineering, National Hankyoung University)
Publication Information
Environmental Analysis Health and Toxicology / v.22, no.2, 2007 , pp. 177-184 More about this Journal
Abstract
Gaseous organochlorine pesticides (OCPs : heptachlor epoxide, p, p'-DDE, ${\gamma}-HCH,\;{\alpha}-chlordane,\;{\gamma}-chlordane$ and trans-nonachlor) concentration was measured using PUF high volume sampler from June, 2000 to June, 2002 in the semi-rural atmosphere. The OCPs concentration in atmosphere, which is estimated by the slope (m) of Clausius-Clapeyron equation and phase-transition energy $({\Delta}H)$, was influenced by revolatilization from environmental matrix (soil, water and tree leaves) and a long range transportation of air mass. But the former affected OCPs concentration more than the latter. The degradation rate constants (k) of OCPs calculated using multiple regression analysis and revised standard temperature method were in good agreement each other. The value of k of ${\gamma}-HCH$ was very low as -0.0007, but the range of k of other components were $-0.00l8{\sim}-0.0038$. The half-life $({\tau})$ which was calculated by k of ${\gamma}-HCH$ was 2.6 years-the longest one, but that of heptachlor epoxide was in 0.5 year-the shortest one. $({\tau})\;of\;{\alpha}-chlordane,\;{\gamma}-chlordane$ and trans-nonachlor in technical chlordane was 1.0, 1.1 and 0.7 year respectively.
Keywords
Gaseous OCPs; Clausius-Clapeyron equation; phase-transition energy $({\Delta}H)$; multiple regression analysis; revised standard temperature method; degradation rate constant (k); half-life $({\tau})$;
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