ABSTRACT
The oxo acids of phosphorus are unique among inorganic oxo acids in that they comprise a class of polymeric, polyelectrolytic compounds of which the individual members form a homologous series. The common acids can be classified as lower oxo acids, linear condensed acids, or cyclic condensed acids. Lower oxo compounds contain one or more phosphorus atoms with an oxidation number of less than five and are characterized by P-H or P-P bonds. All of the phosphorus oxo acids contain ionizable POH groups and show considerable ionic character in aqueous solution. The separation of condensed phosphates was subsequently examined, using eluents containing chelating agents. With the advent of small-particle-size and narrow-distribution packing materials for LC, high-performance and high-efficiency separations for the phosphates have become possible.
