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| Heavy metal pollution in paddy soil and rice grains fromdifferent pollution sources |
| Received:October 24, 2015 |
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| KeyWord:heavy metal;paddy soil;rice grain;bioavailability;pollution source |
| Author Name | Affiliation | E-mail | | CHEN Hong-yan | College of Environment, Hohai University, Nanjing 210098, China | | | YUAN Xu-yin | College of Environment, Hohai University, Nanjing 210098, China | yxy_hjy@hhu.edu.cn | | LI Tian-yuan | College of Environment, Hohai University, Nanjing 210098, China | | | HU Sun | College of Environment, Hohai University, Nanjing 210098, China | | | LIU Qing | College of Environment, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| Heavy metals from different sources may have various pollution degrees in soils and crops. In this study, we estimated bioavailability of As, Cd, Cu, and Zn in paddy soils polluted by different pollution sources using three typical extractants and determined concentrations of heavy metals in rice grains. We also established optimal empirical regression models to predict heavy metals in rice grains. It was showed that HAc and EDTA extracted more heavy metals than CaCl2 did. The bioavailability of soil heavy metals was closely related with their origins and soil properties. The concentrations of extracted As and Cd were relatively higher in soils polluted with industrial wastewater and sewage irrigation, while those of active Cu and Zn were higher in soils with tailing leaching. Based on the optimal empirical regression models, the concentrations of Cd in rice grains were closely related to CaCl2-extractable Cd, while As and Cu in rice grains were predicted well by EDTA-extractable As and Cu, respectively. However, the Zn concentrations in rice grains were poorly predicted. In sum, bioaccumulation of heavy metals originated from sewage irrigation and tailing leaching is better predicted than those from other sources. |
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