Abstract
The ion-exclusion chromatography of orthophosphate (PO 4 3−) and several condensed phosphates (P 2O 7 4−, P 3O 10 5− and P 3O 9 2−) was investigated using a cation-exchange resin column in the H + form. The phosphates eluting from the column were monitored as the corresponding acids with flow coulometric and conductometric detectors. The retention volumes of the phosphates increased with increase in the concentration of organic solvents (acetone and dioxane) in the eluent, and the increases were greater in water-dioxane than in water-acetone. A good separation of the phosphates from each other could be achieved by gradient elution with 80% dioxanewater.
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