1. State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; 2. Hubei Key Laboratory of Mine Environmental Pollution Control & Remediation, School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi 435003, China; 3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Mianzhu—Aba profile, east of the Tibetan Plateau, was selected to study the occurrence of organochlorine pesticides (OCPs) along an altitudinal gradient. Dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs) and Aldrin, Dieldrin and Endrin (Drins) in surface soils were detected in winter (March) and summer (July). Soil concentrations (ng·g-1, dw) in winter and summer ranged as follws: DDTs, 0.37–179.16 and 0.32–42.57; HCHs, 0.14–10.76 and 0.55–32.71; Drins, N.D–3.99 and 0.02–6.93, respectively. Main soil OCPs were p,p′-DDT, p,p′-DDE, β-HCH and Drins, among which Drins were rarely reported in current literature of the Tibetan Plateau. Higher OCP concentrations in the profile were attributed close to the agricultural fields of the Sichuan Basin, current lindane and non-dicofol DDTs inputs, and also long-range atmospheric transport from abroad. Soil OCP concentrations underwent obvious seasonal variation, with higher DDTs in winter and higher HCHs and Drins in summer. It may be caused by climatic conditions, summer monsoon type, and physico-chemical properties of such contaminants. Though “rest” phenomenon occurred in some sampling sites, HCHs and Drins showed an increasing trend with increasing altitude, while DDTs showed an evident decrease with increasing altitude. The altitudinal distributions of OCPs were all consistent with previous findings in other mountainous regions. A primary fugacity analysis on OCPs soil-air exchange indicated that the profile may be secondary sources for HCHs and Endrin. As with Aldrin, Dieldrin, and DDTs, the profile may be both secondary sources and sinks.
. Soil concentrations and soil-air exchange of organochlorine pesticides along the Aba profile, east of the Tibetan Plateau, western China[J]. Frontiers of Earth Science, 0, (): 395-405.
Hongxia LIU, Shihua QI, Dan YANG, Ying HU, Feng LI, Jia LIU, Xinli XING. Soil concentrations and soil-air exchange of organochlorine pesticides along the Aba profile, east of the Tibetan Plateau, western China. Front Earth Sci, 0, (): 395-405.
R is 8.31 Pa m3/(mol·K);Фom is 1.7 times TOC c;Koa is octanol-air partition coefficient of compound d
fa=CaRT
fa is fugacity in air
Ca is air concentration
T is the average air temperature
fs/fa
The fs/fa>1 indicates net volatilization from the soil to air
The fs/fa<1 indicates net deposition from air to soil
The fs/fa ~1 indicates equilibrium
Tab.4
Fig.5
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