Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal

doi:10.1016/j.chemosphere.2018.01.119

	Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal
	Chen, MK (Chen, Mengke)1,3; Gao, SP (Gao, Shaopeng)1; Pokhrel, B (Pokhrel, Balram)1,4; Gong, P (Gong, Ping)1,2,3; Wang, XP (Wang, Xiaoping)1,2,3; Wang, CF (Wang, Chuanfei)1,3
刊名	CHEMOSPHERE
	2018-06-01
卷号	200 期号:0 页码:532-541
关键词	POLYCYCLIC AROMATIC-HYDROCARBONS PERSISTENT ORGANIC POLLUTANTS HEALTH-RISK ASSESSMENT ORGANOCHLORINE PESTICIDES POLYCHLORINATED-BIPHENYLS INDIAN CITIES SURFACE SOILS PARTITION-COEFFICIENTS SOURCE IDENTIFICATION SOURCE APPORTIONMENT
ISSN号	0045-6535
DOI	10.1016/j.chemosphere.2018.01.119
英文摘要	Due to the high temperature and extensive use of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), tropical cities could act as secondary sources of these pollutants and therefore received global concern. As compared with other tropical cities, studies on the air soil exchange of OCPs, PCBs and PAHs in tropical Nepali cities remained limited. In the present study, 39 soil samples from Kathmandu (capital of Nepal) and 21 soil samples from Pokhara (second largest city in Nepal) were collected The soil concentrations of the sum of endosulfans (alpha- and beta-endosulfans) ranged from 0.01 to 16.4 ngig dw. Meanwhile, Sigma dichlorodiphenyltrichloroethane (DDTs) ranged from 0.01 to 6.5 ng/g dw; Sigma 6PCBs from 0.01 to 9.7 ng/g dw; and Sigma 15PAHs from 17.1 to 6219 ng/g dw. High concentrations of OCPs were found in the soil of commercial land, while, high soil PAH concentrations were found on tourist/religious and commercial land. Combined the published air concentrations, and the soil data of this study, the directions and fluxes of air-soil exchange were estimated using a fugacity model. It is clear that Nepal is a country contributing prominently to secondary emissions of endosulfans, hexachlorobenzene (HCB), and low molecular weight (LMW) PCBs and PAHs. The flux for all the pollutants in Kathmandu, with Sigma endosulfans up to 3553; HCB up to 5263; and Sigma LMW-PAHs up to 24378 ng m(-2) h(-1), were higher than those in Pokhara. These high flux values indicated the high strength of Nepali soils to act as a source. (C) 2018 Elsevier Ltd. All rights reserved.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000429891300061
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8641]
专题	青藏高原研究所_图书馆
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China; 2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Kathmandu Univ, Dept Nat Sci, Dhulikhel, Nepal.
推荐引用方式 GB/T 7714	Chen, MK ,Gao, SP ,Pokhrel, B ,et al. Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal[J]. CHEMOSPHERE,2018,200(0):532-541.
APA	Chen, MK ,Gao, SP ,Pokhrel, B ,Gong, P ,Wang, XP ,&Wang, CF .(2018).Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal.CHEMOSPHERE,200(0),532-541.
MLA	Chen, MK ,et al."Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal".CHEMOSPHERE 200.0(2018):532-541.