摘要：

To understand the direct and potential harm of cadmium in alluvial soils along the Yangtze River in Huangshi,Hubei Province,total content of Cd and its speciation characteristics were studied using Tessier sequential extraction method and flame atomic absorption spectrophotometry. Results showed that total Cd content of all soil samples were greater than 2mg/kg. Content of Cd ranked as residual fraction,Fe-Mn oxide bound fraction,carbonate bound fraction,organic bound fraction and ion exchange fraction,in which residual Cd accounted for 58%,and iron manganese oxide bound for 26%,while carbonate bound,organic matter bound and ion exchangeable were only for 8% ,4% and 3% respectively. It was concluded that bioavailable content of Cd was low,and speciation which cannot be used by plant was the highest. Cd in soils under the studied conditions was relatively stable and had little harm to crops.

展开