气候变化领域集成服务门户(CCPortal): Heavy metals in surface sediments in the trans-Himalayan Koshi River catchment: Distribution, source identification and pollution assessment

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DOI	10.1016/j.chemosphere.2019.125410
	Heavy metals in surface sediments in the trans-Himalayan Koshi River catchment: Distribution, source identification and pollution assessment
	Li, Mingyue; Zhang, Qianggong; Sun, Xuejun; Karki, Kabita; Zeng, Chen; Pandey, Aastha; Rawat, Bakhat; Zhang, Fan
通讯作者	Zhang, QG (通讯作者)
发表日期	2020
ISSN	0045-6535
EISSN	1879-1298
卷号	244
英文摘要	Rivers flowing across the Himalayas are important water resources and deliver large amounts of sediment to regional and downstream ecosystems. However, the geochemistry of Himalayan river sediments has been less studied. Surface sediment samples collected from a typical trans-Himalayan river, the Koshi River (KR), were used to investigate the distribution, pollution status and potential sources of heavy metals. Heavy metals did not show significant spatial differences between the upstream and downstream areas of the river, but Cd and Pb displayed higher values in the upstream area. The average heavy metal concentrations in the KR sediments are comparable to the natural background values and are lower than the sediment guidelines. Pollution assessment using the geo-accumulation index (Igeo), enrichment factor (EF) and pollution load index (PLI) suggested negligible anthropogenic disturbances except for slight contamination by Cd, Pb and Cu at a few sites. Principal component analysis revealed that Cr, Co, Ni and Zn were primarily from the parent rock and that Cu, Cd and Pb were derived from both natural and anthropogenic sources. Despite contrasting environmental settings and human activities in the upper and lower reaches of the river, the heavy metals concentrations in the KR sediments showed consistency with natural backgrounds and negligible contamination. The geochemistry of river sediments is a useful indicator of environmental changes, and long-term observations of the geochemistry of trans-Himalayan river sediments are needed to understand the impacts of intensified climate change and human activities on the Himalayan environment. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	TIBETAN PLATEAU RISK-ASSESSMENT TRACE-ELEMENTS CLIMATE-CHANGE WATER-QUALITY YELLOW-RIVER MULTIVARIATE-ANALYSIS ENVIRONMENTAL-CHANGES SPATIAL VARIATION REE GEOCHEMISTRY
英文关键词	Trans-himalayan river; Heavy metals; Sediments; Spatial distribution; Pollution assessment; Sources
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000515197700004
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/259748
推荐引用方式 GB/T 7714	Li, Mingyue,Zhang, Qianggong,Sun, Xuejun,et al. Heavy metals in surface sediments in the trans-Himalayan Koshi River catchment: Distribution, source identification and pollution assessment[J]. 中国科学院青藏高原研究所,2020,244.
APA	Li, Mingyue.,Zhang, Qianggong.,Sun, Xuejun.,Karki, Kabita.,Zeng, Chen.,...&Zhang, Fan.(2020).Heavy metals in surface sediments in the trans-Himalayan Koshi River catchment: Distribution, source identification and pollution assessment.CHEMOSPHERE,244.
MLA	Li, Mingyue,et al."Heavy metals in surface sediments in the trans-Himalayan Koshi River catchment: Distribution, source identification and pollution assessment".CHEMOSPHERE 244(2020).