Abstract

Protonation constants of o-phosphate were studied potentiometrically, using the (H+)-glass electrode in aqueous NaCl, KCl and tetraethylammonium iodide solutions, at 0≤I≤IM and 10≤T≤50°C. The differences found in the protonation constants for different salt solutions are explained by a complex formation model. The formation of the species MPO 4 2− , MHPO 4 − , MH2PO 4 0 , M2PO 4 − and M2HPO 4 0 (M=Na+, K+) is hypothesized. In mixed NaCl-KCl solutions, it is possible to find the mixed metal species NaKPO 4 − and NaKHPO 4 0 . Ionic strength and temperature dependence parameters are reported for all species. The relevance of Na+ and K+ complexes is discussed in connection with speciation problems of natural fluids, such as marine water and urine.

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