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| Distribution characteristics and ecological risk of heavy metals in soil of arable land on Chongming Island |
| Received:March 04, 2022 |
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| KeyWord:arable land;heavy metal;distribution characteristics;ecological risk assessment |
| Author Name | Affiliation | E-mail | | XU Zhihao | Shanghai City Geotechnical Investigation Info Technology Co., Ltd., Shanghai 201206, China | | | WU Jian | Shanghai Academy of Environmental Sciences, Shanghai 200030, China | | | TANG Hao | Shanghai Academy of Environmental Sciences, Shanghai 200030, China | | | WANG Min | Shanghai Academy of Environmental Sciences, Shanghai 200030, China | | | HUANG Botao | Shanghai Academy of Environmental Sciences, Shanghai 200030, China | | | HUANG Shenfa | Shanghai City Geotechnical Investigation Info Technology Co., Ltd., Shanghai 201206, China | huangsf@saes.sh.cn |
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| Abstract: |
| To understand the distribution characteristics of heavy metals in soil of arable land on Chongming Island, cultivated soil samples were collected from 581 locations on Chongming Island. The distribution characteristics of eight heavy metals（As, Cd, Cr, Cu, Ni, Pb, Zn, and Hg）in the samples were investigated, and the potential ecological risks of soil heavy metals were determined using the Nemerow and Hakanson indexes. The results showed that the levels of heavy metals were much lower than the risk control standard（GB 15618—2018）. However, the levels of Cu, Pb, Zn, and Cd in several samples exceeded the standard, showing definite environmental risks. The spatial distribution of Cd showed a gradual decline from the western to eastern regions. The levels of the other heavy metals decreased from high to low successively in the central, western, and eastern regions. The average Nemerow and Hakanson index values were 0.34 and 19.6, respectively, showing a clean level and low ecological risk, and Cd was the main risk contributor. In summary, the soil quality of the research area was safe and low risk, but the accumulation of some heavy metals in the soil of certain areas should be paid attention. |
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