Characteristics of heavy metal content and pollution risk assessment in the soil of typical Emeishan Basalt Area

HAN Wei; XU Ren-ting; WANG Qiao-lin

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6500-6508.

Soil Pollution Control

Characteristics of heavy metal content and pollution risk assessment in the soil of typical Emeishan Basalt Area

HAN Wei, XU Ren-ting, WANG Qiao-lin

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Abstract

To investigate the extent of the influence of Emeishan basalt on soil heavy metal content, the study focused on Zhaotong in Yunnan Province, which is located in a typical distribution area of Emeishan basalt. By combining geological data, the characteristics, pollution risk, and sources of eight heavy metal elements in 7104 soil samples within the region were analyzed and evaluated. The results showed that the surface soil in the Emeishan basalt area is significantly enriched in Cu and Cd, reaching 7.20 and 6.63 times the background values of Chinese soil, respectively. Compared to the risk control standard for soil contamination of agricultural land, except for Hg, the other seven heavy metal elements posed a pollution risk. In terms of spatial distribution of pollution level, Cu, Cd, As, Pb, and Zn were closely associated with the natural source, with Cd and Cu being the highly contaminated heavy metal elements. PCA indicated that Cu mainly originated from the geological parent materials of Emeishan basalt, while Cr and Ni were associated with weathering of coexisting ultrabasic rocks with Emeishan basalt. Cd, Pb, and Zn at high concentrations primarily resulted from human mining activities and vehicle exhaust emissions, as well as being influenced by the geological background. As and Hg were influenced not only by parent material and human activities but also by soil physicochemical properties and organic matter.

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enrichment factor / heavy metals / meishan basalt / principal component analysis / risk assessment / soil

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HAN Wei, XU Ren-ting, WANG Qiao-lin. Characteristics of heavy metal content and pollution risk assessment in the soil of typical Emeishan Basalt Area[J]. China Environmental Science. 2023, 43(12): 6500-6508

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