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《Journal of Anhui Agricultural Sciences》 2012-09
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Transportation and Form Transformation of Exogenous Cadmium in Drab Soil

WANG Xu et al(Resources and Environment Sciences Department,Chifeng University,Chifeng,Inner Mongolia 024000)  
The transportation and form transformation of exogenous cadmium in drab soil were studied by soil pillar experiment and sequential extraction method.As indicated by the results,under unsaturated conditions,the exogenous cadmium was accumulated at 0-15 cm drab soil instead of transporting to the 15-30 cm 90 d after the cadmium entered into the drab soil.30 d after the exogenous cadmium entered into the drab soil,the water-soluble cadmium was rapidly transformed into other forms,and the proportion of each form was shown as exchangeable formresidual formcarbonate-bound formFe/Mn oxide bound formorganic bound formwater-soluble state.During the following sixty days,the proportion of each exogenous cadmium form didn't change obviously,among them the exchangeable form accounted for 43.86% and 44.68% of the total amount respectively before and after,indicating that most of the exogenous cadmium hadn't reached a stable state 90 d after entering into the drab soil,thus producing great harms to the soil-plant system.The adsorption of cadmium by drab soil was achieved through ion exchange and complexation(chelation),and the quantity of adsorbed cadmium through ion exchange was larger than that through complexation(Chelation).
【CateGory Index】: X131.3
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