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Sorbed Ortho- and Pyrophosphate Effects on Zinc Reactions Compared in Three Autoclaved Soils

Dep. of Renewable Resources, Macdonald College of McGill Univ., Ste. Anne de Bellevue, PQ, Canada H9X 1C0

*Corresponding author.

ABSTRACT

Information on interactions between ortho- (OP) or pyrophosphate (PP) and Zn in soils are fragmentary. Evaluating the relative effects of the two phosphates on Zn reaction in the soil requires autoclaving the soil in order to minimize biological hydrolysis of PP to OP. Sequential reactions between OP or PP and Zn in three autoclaved soil samples were compared using Zn sorption, desorption and fractionation at an initial pH 6.0 and ionic strength 0.03 M as KClO₄. Soil materials were surface samples of a Typic Haplorthod, Typic Eutrochrept, and Typic Humaquept. One mmol sorbed P as OP resulted in greater increases in cation-exchange capacity (CEC) than 1 mmol sorbed P as PP. At the same rate of P addition, the absolute increase in CEC was greater with PP than OP, because of greater P sorption as PP than as OP. Both sorbed OP and PP increased Zn sorption and decreased Zn desorption. The sorption of Zn was described best by Freundlich sorption isotherms, rather than Gunary, Langmuir, or Temkin isotherms. Results suggested that complexes of OP- or PP-Zn-soil materials have formed, particularly in the coarser textured materials, with PP being more effective in complexing Zn than OP.

Contribution from Dep. of Renewable Resources, Macdonald College of McGill Univ.

Received for publication March 13, 1989.

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