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电解质阴离子和pH对可变电荷土壤硫酸盐吸附的影响
作者姓名:ZHANG Gang-Y  G. M. BR&#;MMER  ZHANG Xiao-Nian
作者单位:Instttute of Soil Science, Chinese Academy of Sctences, Nanjing 210008 (China);Department of Soil Sctence, University of Bonn, Nussaliee 13, 53115 Bonn (Germany);Instttute of Soil Science, Chinese Academy of Sctences, Nanjing 210008 (China)
基金项目:*1Project funded by a grant from the Alexender von Humboldt-Stifung, Germany.
摘    要:The effects of three electrolyte anions, ionic strength and pH on the adsorption of sulfate by two variable charge soils, with different surface charge properties were studied. Under the conditions of the same pH and ionic strength the effect of electrolyte anions on the adsorption of sulfate was in the order of Cl- > NO3- > ClO4-, indicating the difference of the nature among these three anions. For Ferralsol in the same concentration of chloride and perchloride solutions, the two sulfate adsorption-pH curves could intersect at certain pH value. When pH was higher than the intersecting point, more sulfate was adsorbed in the perchloride solution, while when it was lower than the intersecting point, more sulfate was adsorbed in the chloride solution. In different concentrations of electrolyte solution, the curves of the amount of oxy-acid anion adsorbed, which changed with pH, could intersect at a certain pH, which is termed point of zero salt effect (PZSE) on adsorption. The nature of electrolyte anions influenced obviously the appearance of PZSE for sulfate adsorption. For ferralsol the curves of adsorption converged to about pH 7 in NaCl solution seemed to intersect in NaNO3 solution and to have a typical PZSE for sulfate adsorption in NaClO4 solution. For Acrisol the three curves of adsorption were nearly parallel in NaCl and NaNO3 solutions and converged to pH 6.5 in NaClO4 solution.

关 键 词:effect  of  electrolyte  anion    sulfate  adorption    mariable  charge  soil

Effects of electrolyte anions and ph on adsorption of snlfate by variable charge soils
ZHANG Gang-Y,G. M. BR&#;MMER,ZHANG Xiao-Nian.Effects of electrolyte anions and ph on adsorption of snlfate by variable charge soils[J].Pedosphere,1994,4(3):235-244.
Authors:ZHANG Gang-Y  G M BR&#;MMER and ZHANG Xiao-Nian
Institution:Instttute of Soil Science, Chinese Academy of Sctences, Nanjing 210008 (China);Department of Soil Sctence, University of Bonn, Nussaliee 13, 53115 Bonn (Germany);Instttute of Soil Science, Chinese Academy of Sctences, Nanjing 210008 (China)
Abstract:The effects of three electrolyte anions, ionic strength and pH on the adsorption of sulfate by two variable charge soils, with different surface charge properties were studied. Under the conditions of the same pH and ionic strength the effect of electrolyte anions on the adsorption of sulfate was in the order of Cl- > NO3- > ClO4-, indicating the difference of the nature among these three anions. For Ferralsol in the same concentration of chloride and perchloride solutions, the two sulfate adsorption-pH curves could intersect at certain pH value. When pH was higher than the intersecting point, more sulfate was adsorbed in the perchloride solution, while when it was lower than the intersecting point, more sulfate was adsorbed in the chloride solution. In different concentrations of electrolyte solution, the curves of the amount of oxy-acid anion adsorbed, which changed with pH, could intersect at a certain pH, which is termed point of zero salt effect (PZSE) on adsorption. The nature of electrolyte anions influenced obviously the appearance of PZSE for sulfate adsorption. For ferralsol the curves of adsorption converged to about pH 7 in NaCl solution seemed to intersect in NaNO3 solution and to have a typical PZSE for sulfate adsorption in NaClO4 solution. For Acrisol the three curves of adsorption were nearly parallel in NaCl and NaNO3 solutions and converged to pH 6.5 in NaClO4 solution.
Keywords:effect of electrolyte anion  sulfate adorption  mariable charge soil
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