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Solubility and Equilibria of Zinc in a Flooded Soil¹

ABSTRACT

Soil solution composition data were obtained for flooded Crowley silt loam soil. These data were analyzed with a computer program which corrected for ion-pair formation and computed soil solution Zn activities at 0, 50, and 90% complexation by soluble organic species. The computed values were compared to predicted soil solution Zn activities which would occur if ZnCO₃(c), Zn₂SiO₄(c), Zn₃(PO₄)₂·4H₂O(c), or ZnS(c) were the controlling solid phase. Under flooded soil conditions, ZnS(c) was the only possible solid phase which could be controlling soil solution Zn activity, assuming that the H₂S(g) pressure in the soil solution was similar to that of atmospheric air [pH₂S(g) = 10.3] and that between 50 and 90% of solution Zn was complexed by organic species. Under laboratory conditions where H₂S(g) levels were thought to be much lower than unpolluted air, both Zn₂SiO₄(c) and ZnCO₃(c) appeared to be potential solid phases. Zinc phosphate, Zn₃(PO₄)₂·4H₂O,(c), was too soluble to control solution Zn in this soil.

¹ Contribution from the Dep. of Agronomy, Univ. of Arkansas, Agric. Exp. Stn., Fayetteville 72701, and the Dep. of Agronomy and Soils, College of Agric. Res. Center, Washington State Univ., Pullman 99164. Scientific paper no. 4926. Project 1885. Published with the approval of the Directors of the Arkansas and Washington Agric. Exp. Stn.

² Professor of Agronomy and Professor of Soils, respectively.

Received for publication January 8, 1979. Accepted for publication May 1, 1979.