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| Pollution evaluation and source apportionment of heavy metals in soils from Tianjin suburbs, China |
| Received:September 07, 2018 |
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| KeyWord:heavy metal;soil;Tianjin suburbs;contamination evaluation;multivariate statistical analysis;source apportionment |
| Author Name | Affiliation | E-mail | | SHI Rong-guang | Agro-Environment Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG You-wen | Agro-Environment Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
School of Land and Environment, Shenyang Agriculture University, Shenyang 110866, China | | | XU Meng-meng | Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China | | | ZHENG Xiang-qun | Agro-Environment Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Zong-shan | Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China | zhaozs@qibebt.ac.cn |
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| Abstract: |
| To research the contamination level and sources of heavy metals in soil in suburban areas of Tianjin City, a total of 286 soil samples were collected from three land types (agricultural land, residential land, and industrial land) of soil over an area of 2000 km2, such as farmland, ponds, rivers, green belts, residential land, and manufacturing land. The contents of Cr, Ni, Cu, Zn, As, Pb, and Cd were determined. In addition, the contamination and risk level of heavy metals were discussed using several contamination evaluation and risk assessment methods. Moreover, the source apportionment of heavy metals was carried out by multivariate statistical analysis. The contents of seven heavy metals in these soil samples were 71.47±20.49, 32.15±19.66, 27.77±12.77, 99.78±53.20, 17.59±8.69, 30.27±9.72 mg·kg-1 and 0.19±0.17 mg·kg-1 for Cr, Ni, Cu, Zn, As, Pb and Cd, respectively. The results of the contamination level and ecological risk assessment showed that the soils in the suburbs of Tianjin were generally at moderate pollution and low ecological risk levels, with Cd and As as the main contaminants. The results of the multivariate statistical analysis revealed that Cr and Ni mainly originated from lithogenic sources, the origins of Cu, Zn, Pb, and Cd were a combination of lithogenic sources and anthropogenic sources, and As mainly originated from anthropogenic sources. Our results indicate that the soils with anthropogenic inputs of Cd and As accounted for more than half of the soil samples in the study area; therefore, it is necessary to focus on the monitoring of Cd and As in the local soil. |
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