Abstract
The standard procedure for determining carbonyl compounds involves the addition of strong caustic alkali to 2,4-dinitrophenylhydrazones formed upon the reaction of carbonyl compounds with 2,4-dinitrophenylhydrazine (DNPH). 1 In strong base, the hydrazones form a dark red anion of quinonoid structure, 2 while the corresponding product from the unreacted DNPH decomposes rapidly, resulting in a low blank. The mechanism of this decomposition has never been clearly understood. In this work, we describe a photometric flow injection analyzer for the automated measurement of the carbonyl content of alcohol ethoxylate samples. A detailed study of the mechanism of the alkatine decomposition is reported
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