ABSTRACT
Adsorption of orthophosphate and other oxyanions of phosphorus (P) on anion exchange resins makes it possible to isolate this element from complex matrices such as geological, biological, and industrial materials. The fact that phosphate is not adsorbed on anionic resins from the acid solutions or at higher acid concentrations has been utilized for analytical separations. High molecular weight polymeric anions are adsorbed on strongly basic resins. Their elution with salt solutions is difficult. The polymers should be hydrolyzed in an acid medium at slightly increased temperature and then eluted. Orthophosphate and other oxyanions of P are not retained by strongly acid cation exchange resins, from acid, neutral, and alkaline solutions. Separations of phosphate from the cationic constituents of sample solutions can be effected by their adsorption from dilute solutions of nitric acid, sulfuric acid, perchloric acid, trichloroacetic acid, emylenediaminetetracetic acid (EDTA) and potassium (K) hydroxide.
