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Reactivity of Phenolic Acids in Soil and Formation of Oxidation Products

9001 Bldg., P.O. Box 1706, Dow Chemical Co., Midland, MI 48640

H. H. Cheng

Dep. of Agronomy and Soils, Washington State Univ., Pullman, WA 99164

*Corresponding author.

ABSTRACT

Phenolic acids were shown to be oxidized rapidly in the presence of MnO₂ to form a number of soluble products which were detectable by high pressure liquid chromatography. Some of the oxidation products have higher molecular weights than the parent compounds as shown by mass spectrometry; however, no significant products of polymerization were detected. Tests with ferulic acid showed that these oxidized products were rapidly sorbed to MnO₂ surfaces and became less extractable by acidified organic solvents except after acid or alkaline hydrolysis treatment. Reactions of the phenolic acids with a variety of soils demonstrated that similar oxidation reactions could also occur in natural soils, the extent of which appears, however, to be affected by the nature of soil organic matter on the soil mineral surfaces.

Project 1858. Scientific paper no. 7799. College of Agriculture and Home Economic Research Center, Washington State Univ.

Received for publication July 23, 1987.