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| Distribution of cadmium in soil water-stable aggregates in farmland surrounding a smelter |
| Received:July 13, 2015 |
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| KeyWord:agricultural soil;aggregate;cadmium;distribution;pollution |
| Author Name | Affiliation | | YU Hong-yan | School of Environment and Civil Engineering, Jiangnan University, Jiangsu Wuxi 214122, China | | RUAN Wen-quan | School of Environment and Civil Engineering, Jiangnan University, Jiangsu Wuxi 214122, China | | YANG Guang-long | School of Environment and Civil Engineering, Jiangnan University, Jiangsu Wuxi 214122, China |
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| Abstract: |
| Soil samples were collected from the surface layer of farmland around a smelter and divided into four different sizes of water-stable aggregates by wet-sieving. Cadmium(Cd) fractions and soil physicochemical properties of bulk soil and soil aggregates were measured. Correlation between Cd fractions and physicochemical properties were also analyzed. Content of total Cd in bulk soil was averagely 3.77 mg·kg-1. The main Cd fraction was residual fraction, followed by potentially available fractions. All Cd fractions were enriched in the silt and clay fractions, but little Cd was found in microaggregates. Considering the mass weight of aggregates, total Cd and various Cd fractions were mainly distributed in 2000~250 μm macroaggregates and microaggregates. The main factor affecting the distribution of total Cd was soil organic carbon, whereas the distribution of exchangeable Cd and Cd bound to iron and manganese oxides was primarily affected by CEC. These results suggest that the existence of potentially available Cd fractions in the 2000~250 μm macroaggregates would result in high pollution risk, and that combing physical fractionation of soil particles and chemical fractionation of Cd could provide better understanding of the nature of Cd pollution. |
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