气候变化领域集成服务门户(CCPortal): Gradient distribution of persistent organic contaminants along northern slope of central-Himalayas, China

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DOI	10.1016/j.scitotenv.2006.09.008
	Gradient distribution of persistent organic contaminants along northern slope of central-Himalayas, China
	Wang, Xiao-ping; Yao, Tan-dong; Cong, Zhi-yuan; Yan, Xing-liang; Kang, Shi-chang; Zhang, Yong
发表日期	2006
ISSN	0048-9697
起始页码	193
结束页码	202
卷号	372 期号:1
英文摘要	High mountains may serve as condenser for persistent organic pollutants (POPs) and the vegetation in remote areas has been used as a means to characterized atmospheric concentrations of air pollutants. In this study, organochlorine pesticides (OCPs) and polycyclic aromatic hydrocarbons (PAHs) in Himalayan spruce needle samples from Zhangmu-Nyalam region (central-Himalayas) were analyzed and the altitudinal gradient of these pollutants was investigated. Total HCHs and DDTs concentration in needles were in the range of 1.3-2.9 ng g(-1) dry weight and 1.7-11 ng g(-1) dry weight, which were lower than concentrations reported in spruce needles from Alps, however higher than concentrations in conifer needles from mountain areas of Alberta. Total Himalayan spruce needle PAHs was below 600 ng g(-1) and fluorene, phenanthrene and acenaphthene were abundant individual compounds measured. The ratios of alpha-HCH/gamma-HCH in pine needles were similar with the usual values for technical HCH, implying technical HCHs might be used in this region. The high ratios of o-p'-DDT/p-p'-DDT and no p-p'-DDE measured in this study led to the suspicion that a new source of o-p'-DDT and/or p-p'-DDT existed in this region. In addition, higher ratios of low molecular weight-/high molecular weight-PAHs in this region indicated that petroleum combustion, vehicle emission and low-temperature combustion might be the major contributions of PAH source. To examine the POPs distillation, the analyte concentrations were correlated with altitude. The more volatile OCPs, alpha-HCH, gamma-HCH, aldrin and alpha-endosulfan positively correlated with altitude, however, less volatile OCPs (DDT and DDD) inversely related with elevation. Almost all PAHs detected in this area showed positive correlations with altitude. It is worthy to note that heavy PAHs (Benzo[k] fluoranthene and Benzo[a] anthracene) displayed positive correlation, which implied the sources of PAHs were near the sampling sites. The distillation of POPs was strongly affected by the proximity between sampling sites and contaminant sources. If the contaminant sources are close to the mountains, it may be the dominant factor that controls the concentration gradient. (c) 2006 Elsevier B.V All rights reserved.
关键词	POLYCYCLIC AROMATIC-HYDROCARBONS ORGANOCHLORINE PESTICIDES PINE NEEDLES MOUNTAINS AIR ATMOSPHERE SEDIMENTS VEGETATION PAHS FRACTIONATION
英文关键词	persistent organic pollutants; central-Himalayas; gradient distribution
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000242887700020
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/257408
推荐引用方式 GB/T 7714	Wang, Xiao-ping,Yao, Tan-dong,Cong, Zhi-yuan,et al. Gradient distribution of persistent organic contaminants along northern slope of central-Himalayas, China[J]. 中国科学院青藏高原研究所,2006,372(1).
APA	Wang, Xiao-ping,Yao, Tan-dong,Cong, Zhi-yuan,Yan, Xing-liang,Kang, Shi-chang,&Zhang, Yong.(2006).Gradient distribution of persistent organic contaminants along northern slope of central-Himalayas, China.SCIENCE OF THE TOTAL ENVIRONMENT,372(1).
MLA	Wang, Xiao-ping,et al."Gradient distribution of persistent organic contaminants along northern slope of central-Himalayas, China".SCIENCE OF THE TOTAL ENVIRONMENT 372.1(2006).