The Ultraviolet Absorption Spectra and the Hydrolysis of \overset4P-\overset3P-\overset4P-Acid

Abstract
It has been found that \overset4P-\overset3P-\overset4P-acid in aqueous solutions shows characteristic ultraviolet absorption spectra, which vary remarkably with the pH change of the solutions. The spectra having absorption maxima at 226, both 205 and 230, 224, and 215 mμ can be assigned to P3O85−, HP3O84−, H2P3O83−, and H5P3O8 respectively.