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Destruction of Organic Matter by Hydrogen Peroxide in the Presence of Pyrophosphate and Its Effect on Soil Specific Surface Area¹

ABSTRACT

The effectiveness of hydrogen peroxide in oxidizing soil organic matter was markedly increased by the presence of 0.1M sodium pyrophosphate at pH 7, with residual C after treatment being reduced up to 20 times lower compared to conventional soil peroxidation. "Electropositive" (Orange II) and external (N₂) surface areas increased, whereas "electronegative" (cetyl pyridinium bromide) surface area values generally decreased after H₂O₂ treatment, supporting the assumption that metals released from organic matter may precipitate as hydroxide coatings that hinder further oxidation. Some soil sorption sites appear to be occluded by organic matter, so that changes in soil properties after peroxidation cannot be solely attributed to organic matter.

¹ Contribution from the Laboratory for Soil Chemistry, CNR, Pisa, Italy. Scientific pap. no. 79. The results are from a M.S. thesis by the junior author.

² Director and Graduate Student, respectively.

Received for publication March 30, 1976. Accepted for publication November 9, 1976.

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