Risk Assessment and Source Apportionment of Soil Heavy Metals under Different Land Use in a Typical Estuary Alluvial Island

Ting Sun, Jingling Huang, Yuying Wu, Yuan Yuan, Yujing Xie, Zhengqiu Fan and Zhijian Zheng
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Ting Sun: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Jingling Huang: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Yuying Wu: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Yuan Yuan: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Yujing Xie: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Zhengqiu Fan: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China
Zhijian Zheng: Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China

IJERPH, 2020, vol. 17, issue 13, 1-20

Abstract: Understanding the environmental risks of soil heavy metals (HMs) and identifying their main sources are the essential prerequisites for the prevention and management of soil pollution. Based on a detailed survey of soil HMs (Cu, Cr, Ni, Zn, Pb, Cd, As and Hg) from different land use types (including agricultural land, construction land, wetland, and forest land) in an estuary alluvial island, the environmental risk and source apportionment of soil HMs were investigated. Altogether, 117 soil samples were taken in the study area to appraise the soil HMs environmental risk by using the geo-accumulation index (Igeo), potential ecological risk index (RI), and human health risk assessment (HRA) and to identify its main sources by using positive matrix factorization (PMF) model. The average concentrations of soil HMs (except As) surpassed their reference background values in China. There were no significant differenced in the mean concentrations of HMs in different land use types, except that the Hg concentration in the construction land was significantly higher than that in others. The results of Igeo showed that Cd pollution was unpolluted to moderately polluted, and that the others were unpolluted. The potential ecological risk level for Cd and Hg was “moderated potential risk”, while for Cu, Cr, Ni, Zn, Pb and As was “low potential risk”. Higher contamination was distributed at the west-central area. The results of the HRA indicated that the non-carcinogenic risk and the carcinogenic risk that human beings suffered from HMs in different land uses were insignificant. To more accurately identify the sources of soil HMs, the PMF model coupled with the GIS-spatial analysis was applied. The results showed that agricultural activities, natural source, industrial discharge and river transportation, and atmosphere deposition were the main determining factors for the accumulation of soil HMs in the study area, with the contribution rate of 24.25%, 23.79%, 23.84%, and 28.12%, respectively. The study provides an underlying insight needed to control of the soil HM pollutions for an estuary alluvial island.

Keywords: soil heavy metal; risk assessment; source apportionment; positive matrix factorization; land use (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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