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| Assessment of heavy metal pollution and risk of farmland soil and agricultural products around a smelter in Liaoning |
| Received:April 17, 2020 |
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| KeyWord:smelter;agricultural products;heavy metals;pollution;source apportionment;health risk |
| Author Name | Affiliation | E-mail | | DOU Xue-li | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Bo | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | CUI Jie-hua | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | LI Guo-chen | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | ligc@iae.ac.cn | | WANG Yan-hong | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | wangyh@iae.ac.cn |
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| Abstract: |
| This study assessed the characteristics of heavy metal(Cd and Pb)pollution of farmland soil and agricultural products at distances of 1~15 km to the north of a typical smelter in Liaoning. The sources of heavy metal(Cd and Pb)pollution of agricultural products were explored. The results are as follows. According to the horizontal distribution of heavy metals in soil, the farmland soil around the smelter was significantly polluted and enriched with Cd, Hg, Zn, Pb, and Cu. The over-the-standard rates of Cd and Pb pollution of the edible parts of agricultural products were 100% and 100% for peanut, 69% and 46% for corn, and 16% and 13% for vegetables, respectively. We recommend to reduce the cultivation of peanuts, corn, and pakchoi and appropriately increase the cultivation of Chinese cabbage and radish. The horizontal distribution of heavy metals in soil showed that Cd and Pb content decreased with increasing distance from the smelter. Agricultural products with high heavy metal content were grown in fields near the smelter. The enrichment coefficients (BCF)and transport coefficients(TF)indicated that peanut showed a stronger enrichment capacity of soil Cd than of soil Pb but Pb was more easily transported to corn grains. Cd and Pb content of different organs of agricultural products varied between soil addition and leaf spraying tests. Cd in peanut grains was mainly derived from soil, while Pb in corn grains was mainly derived atmospheric sedimentation. Based on the exposure risk index(HQv), people in this region were found to be at a certain health risk due to Cd and Pb intake through peanut, Cd intake through pakchoi, and Pb intake through corn. |
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