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Geoscience ›› 2022, Vol. 36 ›› Issue (03): 923-932.DOI: 10.19657/j.geoscience.1000-8527.2022.03.12

• Geochemistry • Previous Articles     Next Articles

Geochemical Characteristics and Source Identification of Heavy Metals in the River Sediments of Daliangzi Pb-Zn Mining Area in Panxi

ZHU Yinghai1(), SHI Zeming1,2(), WANG Xinyu1, ZHANG Kailiang1, ZHU Bocheng1   

  1. 1. College of Earth Sciences, Chengdu University of Technology, Chengdu,Sichuan 610059, China
    2. Sichuan Province Key Laboratory of Nuclear Techniques in Geosciences,Chengdu,Sichuan 610059, China
  • Received:2021-03-11 Revised:2021-10-20 Online:2022-06-10 Published:2022-07-19
  • Contact: SHI Zeming

Abstract:

The upper Yangtze River region is an important ecological security barrier for the Yangtze River Economic Belt. The river sediments collected from Daliangzi Pb-Zn mining area, Panxi in the upper reaches of the Yangtze River were investigated in this study. The spatial distribution, source, pH-dependent leaching characteristics, and ecological risk levels of heavy metals were evaluated. The results indicated that the concentration of heavy metals in the river sediments of Daqiaohe River in Panxi, whose spatial distribution of heavy metals was inhomogeneous extremely was significantly higher than in the Yangtze River. The comprehensive potential ecological risk index (RI) of heavy metals is very strong. Hg and Cd with high enrichment were severely polluted, Pb and Zn with moderate enrichment were moderately contaminated. The leaching tests showed that the concentrations of Pb, Zn and Cd in the leachate decreased rapidly and then stabilized under acidic and neutral conditions, and As decreased rapidly and then increased slowly. The source of As, Cd, Pb and Zn in the sediments of Daqiaohe River was the mining of Daliangzi Pb-Zn mining area. The source of Hg was rock weathering and pedogenesis. The source of Cu and Cr were agricultural and industrial activities. The soils in the Pb-Zn mining area of Panxi metallogenic belt were Cd-rich and Cr-poor. Cd, Pb, Zn and Hg with high ecological risks were the main potential contaminants.

Key words: sediment, heavy metal, risk assessment, leaching test, source

CLC Number: