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Passive air sampling of organochlorine pesticides in a northeastern state of India,Manipur

Journal of Environmental Sciences 2011年第5期23卷 808-815页

作者： Ningombam Linthoingambi Devi Shihua Qi Paromita Chakraborty Gan Zhang ishwar chandra yadav State Key Laboratory of Biogeology and Environmental Geology School of Environmental Studies China University of Geosciences Wuhan 430074 China. E-mail: nldevi.cug@*** State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of sciences Guangzhou 510640 China tate Key Laboratory in Marine Pollution Department of Biology and Chemistry City University of l-long Kong Hong Kong Chin Center of Advanced Study in Botany Banaras Hindu University Varanasi-221005 Uttarpradesh India

Thirty-six polyurethane foam disk passive air samplers （PUF-PAS） were deployed over a year during January to December, 2009 at three locations, i.e., Imphal （urban site）, Thoubal （rural site） and Waithou （alpine site） of Manipur, to assess the seasonal local atmospheric emission of selected organochlorine pesticides （OCPs）. The average concentration of HCHs monitored at mountain site during hot season （Mar, Apr, and May） and rainy seasons （Jun, Jul, Aug, and Sep） were 403 and 349 pg/m3, respectively. DDTs had a high concentration with 384 pg/m3 at rural site and 379 pg/m3 at urban site during hot seasons. Endosulfans and chlordane were found high in concentration during hot seasons （260 pg/m3） and low during retreating monsoon seasons （44 pg/m3） at rural site. Most of the OCPs concentrations were high during cultivation period. The OCP concentrations of rainy season were highly correlated （p 〈 0.01） with OCPs of hot seasons. Further, positive correlation （p 〈 0.05） was also obtained between cold seasons and retreating monsoon. Principal component analysis showed a significant correlation among the four seasons and distribution pattern of OCPs in air. Back trajectory analysis by using HYPSLIT model showed a long range air transport of OCPs to the present study area. Present OCP levels at Manipur is an outcome of both local emission and also movement of air mass by long range atmospheric transport.

关键词： organochlorine pesticides polyurethane foam urban rural mountain Manipur

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