贺江水系沉积物重金属空间分布特征、来源及潜在生态风险

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Abstract

In order to investigate the spatial distribution characteristics of heavy metals, and to discriminate their sources and potential ecological risks in surface sediments of the Hejiang River, a sum of 41surface sediment samples were collected. Total contents of As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sb, Tl, V, Zn and Fe in these samples were measured by the inductively coupled plasma mass spectrometry (ICP-MS) and the inductive plasma optical emission spectrometry (ICP-OES). Principal component analysis (PCA) and Pearson correlation analysis were used to deduce its potential emission sources of these elements. Geo-accumulation index (I_geo), enrichment factor (EF) and the Hakanson's potential ecological risk index (E_rⁱ and RI) were calculated to evaluate the pollution degree and ecological risk level of heavy metals in sediments, respectively. Results showed that the contents of heavy metals in sediments were impacted by human activities in different extent, only the average contents of As, Cd, Cu, Mn, Pb, Sb, Tl and Zn were higher than the background values. The calculated I_geos and EFs also showed that the contaminated degree of heavy metals in a descending order were Sb > As > Cd > Pb > Zn > Tl > Cu > Mn > Co > V > Ni > Cr, besides, the Hejiang River was not contaminated by Co, Ni, V and Cr. The ecological risk indexes (E_rⁱ) for all selected metals in a descending order were Sb > Tl > As > Cd > Pb > Cu > Co >Ni > Zn > V > Mn > Cr. Compared with the assessment results of Geo-accumulation index (I_geo) and enrichment factor (EF), E_rⁱ can more scientifically reflect the aquatic environmental quality and ecological hazards of sediments. Moreover, the comprehensive indexes of potential ecological risks (RI) for heavy metals ranged from 65.63 to 1142, and the sum E_rⁱ value of As, Cd, Sb and Tl accounted for 88.30% of RI, suggesting that the Hejiang River occured high potential ecological risk of As, Cd, Sb and Tl. The PCA results showed that the cumulative proportion of the first two components accounted for 79.80% of the total variables, suggesting that As, Cd, Cu, Mn, Pb, Sb, Tl and Zn were controlled by anthropogenic source including agricultural activities, urban wastewater, aquaculture and mining industry, and Fe, Co, Cr, Ni and V were mainly contributed by natural sources such as rock weathering.

Key words： heavy metals sediment source spatial distribution characteristics ecological risk the Hejiang River

Received: 22 January 2017

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X142

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	Articles by authors
	NING Zeng-ping
	LAN Xiao-long
	HUANG Zheng-yu
	CHEN Hai-yan
	LIU Yi-zhang
	XIAO Tang-fu
	ZHAO Yan-long

Cite this article:

NING Zeng-ping,LAN Xiao-long,HUANG Zheng-yu等. Spatial distribution characteristics,sources and potential ecological risk of heavy metals in sediments of the Hejiang River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(8): 3036-3047.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I8/3036

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