Abstract
Useful quantities of pentameta- and heptametaphosphate can be isolated from Graham's salt by fractional precipitation followed by ion-exchange chromatography on a large column of QAE-Sepahdex A-25 gel. The IR spectra of a series of cyclic phosphates from trimeta- to octametaphosphate were measured and the characteristic absorption bands for the cyclic structures were indicated. The gel chromatographic behavior of the series of cyclic phosphates on a Sephadex G-25 column showed that their elution volumes increase with their degree of polymerization and that there is a linear relationship between the distribution coefficient and the logarithm of the degree of polymerization. The distribution of individual cyclic phosphates in Graham's salt was determined by combining gel chromatography on a Sephadex G-25 column with ion-exchange chromatography on a QAE-Sephadex A-25 column.
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