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Differential Thermograms of Selected Organic Acids and Derivatives¹

ABSTRACT

Thirty-eight organic acids and derivatives were characterized by differential thermal analysis (DTA) employing free access of air. Each thermogram was readily distinguished from the others, inclusive of such closely related acids as fumaric and maleic (cis-trans isomers), and pyrogallic acid (1:2:3 trihydroxy-benzene) and phloroglucinol (1:3:5 trihydroxy-benzene). In general, the peaks were sharp and duplication of the thermograms was highly satisfactory. Although the mechanism involved was not clearly elucidated, the thermograms evidenced fundamental differences in molecular structure.

¹ Contribution from the Department of Soils and the Department of Bacteriology, University of Wisconsin, Madison. Published with the approval of the Director, Wisconsin Agr. Exp. Sta.

² Research Assistant and Professors of Bacteriology and Soils, respectively.

Received for publication April 6, 1959. Accepted for publication May 27, 1959.