西藏中部河流、湖泊表层沉积物及其周边土壤重金属来源解析及风险评价

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Abstract To understand the pollution characteristics, spatial distribution, potential sources and ecological risk of heavy metals in the surface sediments of river-lake system in Tibet, the total amounts of 16heavy metals (As, Ba, Cd, Co, Cr, Cu, Hg, Mn, Mo, Ni, Pb, Sb, V, Zn, Al and Fe) of rivers, lakes and their surrounding soils in central Tibet were determined. The potential sources of heavy metals were preliminarily apportioned and identified by principal component analysis-absolute principal component score-multiple linear regression (PCA-APCS-MLR) receptor model. Descriptive statistics showed that As, Cd, Hg and Ni accumulated and presented as severe pollutants in sediments of study area, especially for Hg and As. Enrichment factor, geo-accumulation index and pollution load index all indicated that there were moderate pollutions for Hg, followed by As, Cd and Ni. Mean sediment quality guideline quotient and comprehensive indexes of potential ecological risks showed that Hg, As, Cd and Ni exhibited the moderate potential ecological risks, among which Hg exhibited the highest risks. Spatially, the relatively serious contaminated areas were the Lake Angrenjincuo, Duilong Qu and adjacent lakes, and As displayed a widest spatial pattern. PCA-APCS-MLR revealed that the three main sources of heavy metals in sediments in the central Tibet were natural sources, traffic activities and atmospheric transport, geothermal and mining. Cobalt, Cr, Cu, Hg, Mn, Ni, V, Zn, Al and Fe mainly originated from natural sources, while Ba, Mo, and Pb mainly associated with traffic activities and atmospheric transport; Arsenic was almost entirely derived from geothermal and mining; sources of Cd and Sb were relatively extensive, all three potential sources contributed to Cd and Sb to some extent. High contents of Cd and Hg in soil might have been affected by traffic activities, and long-range transportation via the atmospheric dispersion of dusts from industrial activities.

Key words： Tibet heavy metals sources ecological risk PCA-APCS-MLR receptor model

Received: 03 March 2020

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	YANG An
	XING Wen-cong
	WANG Xiao-xia
	HU Jian
	LIU Xiao-long
	LI Jun

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YANG An,XING Wen-cong,WANG Xiao-xia等. Source and risk assessment of heavy metals in surface sediments of rivers, lakes and their surrounding soils in central Tibet[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4557-4567.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4557

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