Effect of Sulfate on Adsorption of Zinc and Cadmium by Variable Charge Soils *1English Full Text
ZHANG GANGYA 1, G. W. BRMMER 2 and ZHANG XIAONIAN 1 1 Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821,Nanjing 210008 (China) 2 Department of Soil Science, University of Bonn, Nussalle 13, D 53115 Bonn (Germany)
Abstract: SO 4 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 when the soil reacted with the sulfate prior to the metal. The shift in pH 50 for both Zn and Cd adsorption was also 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 formation of the ternary surface complex S SO 4 M might also play a role in the effect.
- Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
- Subject：
Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153.61
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