青海典型工业区耕地土壤重金属评价及源解析

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Abstract In order to understand the current status, spatial distribution characteristics, and pollution sources of heavy metal pollution in the cultivated soil around the industrial district of the Yellow River Watershed, 138 surface soil samples were collected from Ganhe Industrial District in Huangshui Watershed, Qinghai Province. The factors including the soil pH and seven heavy metal elements (Cd, As, Pb, Cr, Cu, Ni, and Zn) were measured in the laboratory. According to the standard named Soil environmental quality:Risk control standard for soil contamination of agricultural land, methods including the geo-accumulation index, pollution load index, principal component analysis and positive matrix factorization were adopted to evaluate the pollution level and analyse the sources of the heavy metals in the study area. A series of results have been obtained. The concentration ranges of the seven soil heavy metal elements were Cd (0.16~21.80mg/kg), As (3.68~20.80mg/kg), Pb (17.00~223.40mg/kg), Cr (47.22~389.24mg/kg), Cu (16.03~46.06mg/kg), Ni (21.33~93.24mg/kg), Zn (48.60~1535.10mg/kg), respectively. The Cd pollution was the most serious, which had 13 high-risk samples and 52 medium-risk samples. Zn was the second polluting element, which had 13 medium-risk points. There were only two medium-risk samples and one medium-risk sample for Cr and Pb, respectively. For the other elements, all the samples were at low risk. The pollution of heavy metals in the cultivated soils was mostly distributed in the central-eastern part of the study area, which was roughly consistent with the location of the factories and enterprises in the study area. The pollution areas of the two major elements, Cd and Zn, were distributed around the factories and enterprises and showed an obvious trend of gradually decreasing from the centre to outside. The results of the geo-accumulation index and pollution load index showed that most regions of the study area were less polluted. The pollution was more serious in the area around the central-eastern industrial park, and Cd and Zn were the main contributing elements. The sources of heavy metal pollution in the cultivated soil of the study area mainly included transportation, industrial emission, agricultural activities, coal-fired power generation, and natural soil formation processes.

Key words： cultivated soil heavy metals pollution evaluation PMF model

Received: 02 March 2021

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	Articles by authors
	YIN Fang
	FENG Kai
	YIN Cui-jing
	BAI De-zhen
	WANG Rui
	ZHOU Yuan-yuan
	LIANG Yong-chun
	LIU Lei

Cite this article:

YIN Fang,FENG Kai,YIN Cui-jing等. Evaluation and source analysis of heavy metal in cultivated soil around typical industrial district of Qinghai province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5217-5226.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5217

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