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| Evaluation and source apportionment of heavy metal pollution in Xihe watershed farmland soil |
| Received:September 20, 2016 |
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| KeyWord:Xihe;heavy metal;pollution evaluation;PMF;source apportionment |
| Author Name | Affiliation | E-mail | | NING Cui-ping | College of Resource and Environmental Science, University of Chinese Academy of Sciences, Beijing 100049, China
Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | LI Guo-chen | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | WANG Yan-hong | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | wangyh@iae.ac.cn | | LI Bo | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | TIAN Li | College of Resource and Environmental Science, University of Chinese Academy of Sciences, Beijing 100049, China
Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | WANG Shi-cheng | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | |
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| Abstract: |
| Long-term discharging of industrial and domestic waste water into Xihe, Shenyang, decreased the quality of water as well as the surrounding soil. In October 2015, 134 topsoil samples were collected from the Xihe watershed farmland soil. Distribution characteristics of heavy metals(Hg, As, Pb, Cd, Ni, Cr, Zn and Cu) in the topsoil of this area were analyzed and evaluated. The results indicate that the contents of Hg, As, Pb, Cd, Ni, Cr, Zn and Cu ranged from 0.04 to 1.85, 4.80 to 11.70, 10.80 to 36.70, 0.09 to 1.50, 22.30 to 47.40, 19.60 to 104.00, 71.40 to 242.00 and 31.20 to 105.00 mg·kg-1, respectively; The mean contents of Hg, Cd, Zn, Cu, Ni and Cr in topsoil were higher than background values of Shenyang soil with 3.80, 2.50, 2.04, 2.03, 1.14 and 1.02 times, respectively, which suggested there were varying degrees of enrichment of heavy metals in study soils; Compared to the National Standard for Soil Environment Quality(GB 15618-1995), the exceeding rates of Cd, Cu and Hg were 48%, 9%, 9%. The mean values of single factor pollution indexes of Hg and Cd were 4.52 and 2.96, which were considered as the dominant elements causing heavy metal pollution in the soil. The average comprehensive pollution index of soil heavy metal was 4.13, suggesting severe pollution in this area. The sources of heavy metals was explored by Positive Matrix Factorization(PMF) model, which showed there were four pollution sources:industrial pollution(contribution rate 36.5%), traffic pollution and atmospheric precipitation comprehensive pollution(contribution rate 23.5%), agriculture pollution(contribution rate 20.8%), and soil parent material(contribution rate 19.2%). |
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