Equilibrium studies in natural fluids: interactions of -PO₄³⁻, -P₂O₇⁴⁻ and -P₃O₁₀⁵⁻ with the major constituents of sea water
1998
De Stefano, Concetta | Foti, Claudia | Gianguzza, Antonio | Piazzese, Daniela
The interaction of PᵢO⁽ⁱ⁺²⁾⁻₍₃ᵢ₊₁₎ (i = 1,2,3) with the major components of seawater has been studied potentiometrically, at 25°C, in an artificial seawater (Na⁺, K, Ca²⁺, Mg²⁺, Cl⁻ and SO₄²⁻) at different salinities (5—45%o). Apparent protonation constants have been calculated, from potentiometric data, and estimated, using an appropriate complex formation model. Formation constants of complexes formed by phosphates and the cation of seawater (the inorganic content of seawater being considered as a single 1:1 salt) have been determined. The comparison between experimental and estimated results showed that a suitable complexation model can be used with a fairly good accuracy in predicting acid–base properties of polyphosphates in seawater. The single salt approximation for the inorganic major components of seawater, which is a good tool in estimating the mean strength of polyanion interaction in seawater, has been applied.
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