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ABSTRACT
The suitability of the Ca(OAc)2 and Ba(OH)2 methods for the determination of COOH groups and of "Total Acidity" [sum of COOH + acidic (phenolic) OH] in soil organic matter preparations was evaluated. In addition, COOH groups and "Total Acidity" were also determined by decarboxylation and discontinuous titrations, respectively. These methods were used for the analysis of functional groups in three different humic and three fulvic acids and in 10 known organic compounds, representing types of structures that might occur in humic and fulvic acids.
The Ca(OAc)2 method was found to be suitable for the analysis of COOH groups in most of the known compounds and in the soil organic matter preparations investigated. The Ba(OH)2 method was found to react with acidic hydrogens in both aliphatic and aromatic compounds and was not specific for phenolic OH groups. However, on the basis of available experimental evidence it is believed that the Ba(OH)2 method measures phenolic OH groups in soil organic matter. Both the Ca(OAc)2 and Ba(OH)2 methods are simple and require neither elaborate equipment nor special skills. They appear to be suitable for use in the routine analysis of purified organic matter.
1 Contribution No. 122 of the Soil Research Institute, Canada Department of Agriculture, Ottawa, Ontario.
2 Research Officer and Post-doctoral Fellow of the N.R.C. of Canada, respectively. The junior author is now Research Officer, Experimental Farm, Canada Department of Agriculture, Charlottetown, P.E.I.
Received for publication October 1, 1964. Accepted for publication November 12, 1964.
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