Acid–Base Equilibria of Cysteine in Artificial Sea Water: Effect of Ionic Strength on the Basis of Specific Interaction Theory†

Abstract

Artificial sea water, containing NaCl, KCl, CaCl₂, MgCl₂ and Na₂SO₄, was used as a standard medium in potentiometric equilibrium studies of the sulfur-containing amino acid cysteine: the dependence of activity coefficients on ionic strength, and thus salinities, is discussed according to different models based on the Specific Interaction Theory.

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