Several published methods for preparing 2,4-dinitrophenylhydrazones and determining them colorimetrically have been examined, and a practical system of analysis has been devised from them. The key step is the use of a 2,4-dinitrophenylhydrazine-66 per cent. phosphoric acid column eluted with benzene, as well as light petroleum.
The results of an analysis in the difficult case of a butter fat are described.
A. M. Parsons, Analyst, 1966, 91, 297 DOI: 10.1039/AN9669100297
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