金沙江流域底泥重金属污染特征及来源解析——以蜻蛉河为例

doi:10.11720/wtyht.2025.1043

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Abstract

To understand the characteristics and sources of heavy metal contamination in the sediments of the Jinsha River basin, this study investigated the Qingling River basin-a primary tributary of Longchuan River on the south bank of the Jinsha River. Samples were collected from the sediments of 22 representative sections, and the concentrations of eight heavy metal elements, i.e., As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn, were tested and analyzed. Statistical analysis was conducted on the distribution characteristics of these heavy metal elements in the sediments along the basin. The sources of these heavy metals were investigated using correlation analysis and principal component analysis, and the degree of heavy metal contamination in the sediments was assessed using the geo-accumulation index and the Nemero index. The results indicate that As, Cd, Cu, Hg, Ni, Pb, and Zn are primarily influenced by mining, agricultural, and industrial activities. Cr and Ni originate primarily from soil-forming parent materials. Besides natural sources, Ni is also affected by anthropogenic sources. The assessment results derived using the geo-accumulation and Nemero indices reveal that the eight heavy metal elements exhibit moderate or low contamination on average. However, partial elements, represented by Cd, Hg, Pb, and Zn, exhibit localized enrichment within the basin, primarily concentrated in the Laojiezi Au-Pb-Ag polymetallic mining area and the urban-rural junction in the lower reaches of the county.

Key words： sediment heavy metal contamination characteristic source analysis Jinsha River Qingling River

Received: 30 January 2024 Published: 22 April 2025

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	Yan-Xun CHENG
	Lei XU
	Liang WU
	Meng-Sheng ZHAO
	Fu-Hua WANG
	Kun QIAN
	Hong-Fu ZHENG
	Wen-Hui LI
	Hong-Hui ZHANG

Cite this article:

Yan-Xun CHENG,Lei XU,Liang WU, et al. Characteristics and source analysis of heavy metal contamination in the sediments of the Jinsha River Basin: A case study of the Qingling River[J]. Geophysical and Geochemical Exploration, 2025, 49(2): 500-509.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1043 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I2/500

Study area location (a) and distribution of the sediment samples (b)

Grading criteria of geo-accumulation index

Grading criteria of comprehensive pollution index

Statistics of heavy metals concentration in the sediments

Distribution of heavy metals in the sediments of Qingling river

Correlation analysis of heavy metals in the sediments

Principal component analysis of heavy metals concentrations in the sediments

Principal component loading of heavy metals in the sediments

Class distribution of I_geo for heavy metals in the sediments

Class distribution of P_i of heavy metals in the sediments

Class distribution of Nemero comprehensive pollution index of heavy metals in the sediments

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