气候变化领域集成服务门户(CCPortal): Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal

CCPortal

DOI	10.1016/j.chemosphere.2018.01.119
	Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal
	Pokhrel, Balram; Gong, Ping; Wang, Xiaoping; Chen, Mengke; Wang, Chuanfei; Gao, Shaopeng
通讯作者	Wang, XP (通讯作者)
发表日期	2018
ISSN	0045-6535
EISSN	1879-1298
起始页码	532
结束页码	541
卷号	200
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.
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
英文关键词	Organochlorine pesticides; Polychlorinated biphenyls; Polycyclic aromatic hydrocarbons; Nepal; Air-soil exchange; Flux; Fugacity
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000429891300061
来源期刊	CHEMOSPHERE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259220
推荐引用方式 GB/T 7714	Pokhrel, Balram,Gong, Ping,Wang, Xiaoping,et al. Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal[J]. 中国科学院青藏高原研究所,2018,200.
APA	Pokhrel, Balram,Gong, Ping,Wang, Xiaoping,Chen, Mengke,Wang, Chuanfei,&Gao, Shaopeng.(2018).Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal.CHEMOSPHERE,200.
MLA	Pokhrel, Balram,et al."Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal".CHEMOSPHERE 200(2018).