| 硫酸盐对锌和镉在可变电荷土壤上吸附的影响 |
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| 作者姓名： | ZHANG Gang-Y G. W. BRMMER ZHANG Xiao-Nian |
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| 作者单位： | [1]InstituteofSoilScience,theChineseAcademyofSciences,P.O.Box821,Nanjing210008（China） [2]DepartmentofsoilSc,theChineseAcademyofSciences,P.O.Box821,Nanjing210008（China） |
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| 基金项目： | *1Project supported by a grant from the Alexander von Humboldt-Stiftung, Germany. |
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| 摘 要： | SO4^2- and Zn^2 or Cd^2 were added to three variable charge soils in different sequences.In one sequence sulfate was added first ,and in the other,Zn^2 or Cd^2 first.The addition of sulfate to the system invariably caused an increase in adsorption of the heavy metal added,with the effect more remarkable whn the soil reacted with the sulfate prior to the metal.the shift in pH50 for both Zn and Cd adsorption was aslo comparatively larger in the first sequence of reactions .It was suggested that the increase in negative charge density and the resultant negative potential of the soil were the primary cause of the pronounced effect of sulfate on adsorption of Zn or Cd,and the formaiton of the ternary surface complex-S-SO4-M might also play a role in the effect.
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| 关 键 词： | 吸附作用 阴离子 镉 硫酸盐 土壤 锌 PH值 |
Effect of sulfate on adsorption of zinc and cadmium by variable charge soils |
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| ZHANG Gang-Y,G. W. BRMMER,ZHANG Xiao-Nian.Effect of sulfate on adsorption of zinc and cadmium by variable charge soils[J].Pedosphere,1998,8(3):245-250. |
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| Authors: | ZHANG Gang-Y G W BRMMER and ZHANG Xiao-Nian |
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| Institution: | Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 China. |
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| Abstract: | SO4^2- and Zn^2 or Cd^2 were added to three variable charge soils in different sequences.In one sequence sulfate was added first ,and in the other,Zn^2 or Cd^2 first.The addition of sulfate to the system invariably caused an increase in adsorption of the heavy metal added,with the effect more remarkable whn the soil reacted with the sulfate prior to the metal.the shift in pH50 for both Zn and Cd adsorption was aslo comparatively larger in the first sequence of reactions .It was suggested that the increase in negative charge density and the resultant negative potential of the soil were the primary cause of the pronounced effect of sulfate on adsorption of Zn or Cd,and the formaiton of the ternary surface complex-S-SO4-M might also play a role in the effect. |
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| Keywords: | adsorption cadmium sulfate variable charge soil zinc |
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