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| Cadmium fraction distribution and its influencing factors in paddy soils polluted by different pollution sources |
| Received:January 21, 2016 |
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| KeyWord:paddy soil;cadmium;chemical fraction;affecting factor |
| Author Name | Affiliation | E-mail | | LIU Ying | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LU Wei-sheng | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | lws2869@scau.edu.cn | | ZHAO Yang | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LI Gui-jie | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LI Hua-xing | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | ZENG Zu-lei | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | ZHANG Qiu-hua | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| The environmental problems of Cd contaminated soils are of great concern all over the world. Cadmium toxicity in soil is not only related with total concentration, but also depends on its chemical forms. Six different contaminated paddy soils in Guangdong Province, Southern China, were collected. Cadmium chemical fractions were determined by the BCR protocol, and stepwise regression method was employed to characterize the relationship between cadmium fractions and soil properties. Results showed that total Cd content in six paddy soils was higher than the Class II of the soil environmental quality standards. Cadmium concentrations in soils around smelter were the highest, followed by soils around steel plant, thermal power plant, and lead-zinc mine in Shangba village and Zhongshan. Soil Cd was dominated by acid extractable fraction. Risk assessment code(RAC) indicated that Cd was at very high risk level in soils around steel plant, smelter and thermal power plant, and high risk level in soils around lead-zinc mine, Shangba village and Zhongshan. The total Cd concentration was the dominant factor affecting Cd chemical fractions. Soil pH, clay content, and MnAAO content also affected soil Cd fractions to some extent. Residual Cd fraction was not correlated with soil properties. |
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