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| Transfer of Heavy Metals in Soil and Vegetable Systems Nearby Tongling Mining Area, China |
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| KeyWord:soil; heavy metal; bioavailability; vegetable |
| Author Name | Affiliation | | DOU Chang-ming | Anhui Academy of Environmental Science, Hefei 230061, China | | XU De-cong | Characteristic Planting Seedling Production Engineering Technology Research Center, Suzhou University, Suzhou 234000, China
School of Resource and Environment, Anhui University, Hefei 230601, China | | ZHOU Xiao-tie | Anhui Academy of Environmental Science, Hefei 230061, China | | SUN Qing-ye | School of Resource and Environment, Anhui University, Hefei 230601, China | | DOU Zhi-yong | School of Resource and Environment, Anhui University, Hefei 230601, China | | ZHOU Ping | School of Resource and Environment, Anhui University, Hefei 230601, China |
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| Abstract: |
| Soil heavy metal pollution threatens human health mainly via food chain. We investigated the transfer characteristics of heavy metals（Cu, Zn, Pb, Cd） from soils to the edible parts of two vegetable species grown in the vicinity of Tongling mining area, China. Plants and corresponding surface soil samples were collected. Five extraction procedures（DTPA, EDTA, HCl, NH4NO3 and NH4OAc） were used to measure the bioavailability of soil heavy metals. Stepwise multiple linear regression analysis was used to correlate heavy metal concentrations in soils and plants. It showed that soil Zn extracted by NH4NO3 and NH4OAc and soil Cd by NH4NO3 had good correlation with metal concentrations in the edible parts of the vegetables. Soil Pb extracted by all five extractants had no significant correlation with plant Pb concentrations. Soil phosphorus showed a determinant variable in the estimation of extractable Zn and Cu. Root vegetables showed higher accumulation of all metals than fruit vegetables in their edible parts. For all the metals studied, the correlation between the transfer factor（TF）values and extractable metal concentrations in the corresponding soils could be well described by power or exponential models. Therefore, these models may be used to estimate heavy metal accumulation in vegetables. |
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