天山北坡经济带土壤重金属来源及污染评价

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Abstract In order to quantitatively identify and evaluate the sources and ecological risks of heavy metals in the Qitai, Jimsar, Fukang and other areas on the north slope of the Tianshan Mountains, we collected 171soil samples from the study area and analyzed the concentrations of Zn, Cu, Cr, Pb, Hg, As and Cd in soil. We used statistical methods of principal component analysis, positive matrix factorization (PMF) and potential ecological risk index to evaluate the degree of heavy metal pollution and to carry out source analysis. The results showed that:except for Zn, Cu, and Cr, the average concentration of Pb, Hg, As, and Cd in the soil exceeded Xinjiang soil heavy metal background values 4.1, 2.0, 8.0and 48.0times, respectively; compared with the national soil heavy metal risk screening value, the concentrations of Zn, Cr, and Hg were within the safe range. A few sample points of Cu and Pb were seriously polluted, exceeding the screening value. The average values of As and Cd exceeded the screening value by 3.09 times and 19.17times, respectively. According to the results of pollution source analysis the main pollution sources of soil in the study area are coal combustion, transportation, atmospheric dust, agricultural and industrial emissions as well as natural factors. The ecological risk assessment results showed that at all sampling points Zn, Cu, Cr, and Pb were at a slight risk state, Cd was at a very high-risk level; 73.68% of Hg was at a medium risk, 18.71% was at the high risk, 43.86% of As was at a moderate ecological risk, 51.46% was at the high risk. The comprehensive potential ecological risk index of the study area ranged from 472 to 2575.69, and the contribution rate of Cd to the comprehensive potential ecological index reached 89.24%, followed by As and Hg. The results indicated that Cd in the study area was very harmful to the soil eco-environment. As and Hg concentrations should be paid close attention.

Key words： soil heavy metal PMF model source analysis ecological risk assessment

Received: 06 March 2022

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	YE Pan-qing
	Abdugheni Abliz
	SUN Xiao-li
	Halidan Aisaiduli

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YE Pan-qing,Abdugheni Abliz,SUN Xiao-li等. Source analysis and pollution assessment of soil heavy metals in the economic belt on the northern slope of Tianshan Mountains[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4704-4712.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4704

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