基于PMF模型的兰州耕地土壤重金属来源解析

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Abstract In order to analyze the pollution status, spatial distribution and sources of heavy metals (Pb, Cd, Cr, Hg, As, Cu, Zn, Ni), 382 cultivated land surface soil samples were collected from Lanzhou in September 2019 and their heavy metal content was determined. The results showed that the mean concentrations of heavy metals Pb, Cd, Cr, Hg, As, Cu, Zn, and Ni in the samples were 20.96, 0.24, 0.05, 6.40, 8.36, 48.57, 101.92, and 34.34mg/kg, respectively. Among them, the mean concentrations of Hg exceeded the national soil pollution risk screening value, mean concentrations of Cd, Hg, Cu, Zn, and Ni exceeded the local soil background values. The comprehensive index revealed that 52.62% of sample points in the study area showed low pollution, 37.70% of the samples showed moderate pollution, 3.66% of the samples showed severe pollution, and only 6.02% of the samples were free of heavy metal pollution. The potential ecological risk index analysis indicated that 13.09% of the samples were with low ecological risks, 68.85% of the samples were with moderate ecological risks, 17.54% of the samples were with high ecological risks, and 0.52% of the samples were with extreme ecological risks. The source analysis based on the PMF model revealed that there were four main sources of these eight heavy metals. Transportation sources were the main source of Pb, Cd, Zn, and Ni with contribution rates of 52.4%, 50.7%, 56.7%, and 50.2%, respectively. Agricultural activities and medical equipment were the main source of Hg with contribution rates was 83.7%. Natural sources were the main source of Cr, Cu, and Ni with contribution rates of 81.2%, 61.3%, and 49.8%, respectively. Industrial activity was the main source of As with contribution rates of 68.3%. In terms of spatial distribution, except Cr, the concentration of Pb, Cd, As, Cu, Zn, and Ni were higher in Chengguan District and Qilihe District, particularly, the concentrations of Zn and Ni had relatively wide high-value due to possible human impacts. Hg had high concentration values in research areas outside of Chengguan District, Anning District, and Qilihe District.

Key words： cultivated soil heavy metals positive matrix factorization distribution characteristic

Received: 16 February 2020

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X53

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	Articles by authors
	CHAI Lei
	WANG Xin
	MA Liang
	CHENG Zhen-xiang
	SU Li-min
	WANG Yu-hong

Cite this article:

CHAI Lei,WANG Xin,MA Liang等. Sources appointment of heavy metals in cultivated soils of Lanzhou based on PMF models[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3919-3929.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3919

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