SOME FACTORS INVOLVED IN THE DECARBOXYLATION RATE OF URONIC GROUPS OF SOIL ORGANIC MATTER AND PECTIN

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Abstract
Similarity in the rate of CO2 evolution from soil organic matter to that from pectin when boiled with 12% soln. of HCl, according to the method of Lefevre and Tollens, indicates that uronic units are present in soil organic matter. The presence of carbonates, soil-absorbed CO2, and manganese oxides of soils increased the yield of CO2 during the initial boiling period. The rate of CO2 evolution from soil organic matter and pectin during the uronic acid detn. was similarly influenced by changes in temp. and conc. of HCl as well as by additions of reducing substances.

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