Abstract
The isolation of mono- and di- n-butylphosphoric acids from commercially available mixtures has been examined. A simple solvent extraction method based on the distribution of the acids between carbon tetrachloride-water, and diethylether-water, mixtures has been developed to obtain the individual acids with < 1 per cent of total (< 0·5 per cent acidic) impurities. A rapid paper chromatographic method of analysis is described which uses upward elution with a basic solvent mixture. The separated acids are then detected by spray reagents and the method allows approximately 0·5% v/v of each acid to be estimated visually in the presence of the other.
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