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| Enrichment characteristics and risk prediction of heavy metals for rice grains growing in paddy soils with a high geological background |
| Received:June 06, 2017 |
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| KeyWord:heavy metal;soil;rice;risk prediction;high geological background farmland |
| Author Name | Affiliation | E-mail | | TANG Dou-dou | College of Environment, Hohai University, Nanjing 210098, China | | | YUAN Xu-yin | College of Environment, Hohai University, Nanjing 210098, China | yxy_hjy@hhu.edu.cn | | WANG Yi-min | College of Environment, Hohai University, Nanjing 210098, China | | | JI Jun-feng | School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China | | | WEN Yu-bo | School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China | | | ZHAO Wan-fu | School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China | |
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| Abstract: |
| In this study, we determined the concentrations of As, Cd, Pb, Ni, Cu and Zn in paddy soils and rice grains from two study areas(Zhejiang and Guangxi) and analyzed the bioaccumulation factors and influencing factors in the soil-rice system. The optimal empirical equations to predict heavy metals in rice grains were established, which include available heavy metals(EDTA-extractive content) and the physicochemical parameters of soils. The results showed that the main excessive elements in soils were Cd and As in Zhejiang, whereas Pb, As and Cd concentrations in soils markedly exceeded the background values in Guangxi. However, only the Cd contents in rice grains from Zhejiang were greater than the national standard level. The bioaccumulation factors of heavy metals in rice grains were fairly low, and were significantly different from those of farmlands contaminated by anthropogenic sources. Correlation analysis and the regression prediction equation showed that available heavy metals, along with the pH, organic matters, and CaO values in soils were the key factors affecting the bioaccumulation of heavy metals in rice grains of the study areas. |
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