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Reactions of Triammonium Pyrophosphate with Soils and Soil Minerals¹

ABSTRACT

Whole soils of several genetic groups promoted hydrolysis of pyrophosphate to orthophosphate in dilute solutions, but the catalytic action was largely biological. Clay minerals and hydrous oxides, particularly iron oxide, showed some catalytic activity which might be significant in sterile, dilute pyrophosphate solutions. The microorganisms were inactive in solutions more concentrated than 0.2M in pyrophosphate.

Autoclaved specimens of kaolinite, montmorillonite, and goethite suspended in sterile 0.5 or 2.0M solutions of (NH₄)₃-HP₂O₇ for 15 weeks were practically inert, but gibbsite dissolved slowly in both solutions and Al(NH₄)₂P₂O₇OH · 2H₂O began to crystallize from the 0.5M solution after 5 weeks. Less than 6% of the pyrophosphate in these solutions, with or without suspended mineral, was hydrolyzed in 15 weeks; only goethite increased the hydrolysis, and that barely significantly.

Pyrophosphate was adsorbed more strongly on clays and soils than was orthophosphate.

Contribution of the Fundamental Research Branch, Division of Chemical Development, TVA, Muscle Shoals, Ala. 35660. Presented in part before Div. S-2, Soil Science Society of America, Nov. 8, 1967, Washington, D.C.

² Research Chemist; Soil Chemist, presently Senior Lecturer in Agricultural Chemistry, Dept. of Agriculture, University of Queensland, St. Lucia, Brisbane, Australia; and Research Chemist, presently Graduate Student, Dept. of Soil Science, North Carolina State University, Raleigh.

Received for publication December 2, 1968. Accepted for publication January 21, 1969.