Heavy Metal Pollution Characteristics and Risk Evaluation of Soil Around Coal Gangue Stockpile Area

Abstract

Abstract: In order to explore the distribution characteristics and potential risks of heavy metals in long-term storage of coal gangue in the surrounding soil. This study selected the prevailing wind direction soil around the coal gangue stockpile area of the Ningxia Zaoquan coal mine as the research object. The total concentrations and speciation characteristics of 5 kinds of heavy metals (Cu, Zn, Pb, Cr, Mn) in the object soil were analyzed. Meanwhile, the bioactivity of heavy metals was also analyzed and evaluated. The result shows that the concentrations of heavy metals (Zn, Pb and Mn) are high at the edge of the stockpile area due to the long-term storage of coal gangue, wind and rainwater leaching, and decrease with the increase of distance from the stockpile area. The soil pH value has an extremely significant negative correlation with the concentration of total content of Zn and Pb, the commuting states of Pb and Cr, the organic matter binding states of TN and Cu, and the extremely significant positive correlation with the residue state of TN and Cu, respectively. Meanwhile, there is a significant negative correlation between the concentration of total Mn and pH value. The RAC evaluation results show that all the heavy metals except Pb have a low potential risk for soil.

Key words: coal gangue, soil, heavy metal, relevance, pollution characteristic, risk evaluation

CLC Number:

X825

WANG Yandong, LI Xiaoguang, LI Jiaxi, LI Wei, ZHANG Mingtian, ZHAO Chen, ZHANG Lieyu, LI Weiping. Heavy Metal Pollution Characteristics and Risk Evaluation of Soil Around Coal Gangue Stockpile Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3464-3471.

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