A titrimetric method for total phosphoric anhydride

Examination of Oxyacids of Phosphorus by Electrochromatography

“…Many chemical procedures that have been devised for the detection (7,11,28, 43, 69), estimation (8,9), and separation (27,35,88,46) of the phosphorus oxyacids, including colorimetry (20,84,37), titrimetry (2,22,44,68), and precipitation (35, 4^~44, 66), are not widely applicable to complex mixtures, particularly to those containing interfering substances. Differential migration methods such as paper chromatography have served for the examination of various oxyacids (1, 18, 31), some condensed acids (10, 15-17, 29, 59, 67), and certain phosphate esters (28), especially when supplemented by sensitive colorimetric methods for the detection of the separated substances (84).…”