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《Journal of Ecology and Rural Environment》 2008-04
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Role of Variable Charge Soils of Removing Phosphate From Water Body Through Adsorption.

WANG Yong1,2,3,XU Ren-kou1(1.State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;2.College of Life Technology,Henan Institute of Science and Technology,Xinxiang 453003,China;3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
An experiment was conducted to study P adsorption capacity of four kinds of variable charge soils in water,using the one-batch method and soil-column leaching method.Results show that the variable charge soils were very strong in P adsorption capacity,displaying an order of Oxisol(Kunming)Ultisol(Liuzhou) ≈ Oxisol(Xuwen)Ultisol(Yingtan),which is the same as the ones for content of free Fe/Al oxides in the soils.This suggested that Fe/Al oxides in the soils were a major factor affecting adsorption of phosphate.Desorption of pre-adsorbed phosphate from the soils in 0.01 mol·L-1 NaNO3 solution was found to be insignificant and normally less than 10% of the adsorbed phosphate.However,citric acid induced desorption of pre-adsorbed phosphate from the soils.The findings suggested that phosphate was adsorbed by the variable charge soils mainly through non-electrostatic adsorption mechanism.The results of the leaching experiment show that given that phosphorus concentration of the leachate is 0.4 mg·L-1,the amounts of phosphate adsorbed by Oxisol(Kunming),Ultisol(Liuzhou),Oxisol(Xuwen) and Ultisol(Yingtan) reached as high as 1 792,1 536,1 408 and 1 280 mg·kg-1,respectively.Therefore,the variable charge soils,especially the soils high in Fe/Al oxide content,may potentially be employed as P adsorbent to remove phosphate from water bodies.
【Fund】: 国家“十一五”科技支撑计划(2006BAJ10B06)
【CateGory Index】: X132
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