Abstract
The stoichiometric dissociation constant, pK ∗ of TRISH + has been determined in NaCl, KCl, MgCl 2 and CaCl 2 solutions to an ionic strength of 6 molal. The results have been used to derive Pitzer coefficients for the interactions of TRIS with Na +, K +, Mg 2+ and Ca 2+ ions. These results can be used to determine the pK ∗ of TRISH + in mixed brines which can be used to calibrate pH electrodes. Measurements of pK ∗ of TRISH + in mixtures of NaCl-MgCl 2, NaCl-CaCl 2, NaCl-Na 2SO 4, KCl-MgCl 2 and KCl-CaCl 2, artificial seawater and Dead Sea waters were made to determine the reliability of the Pitzer coefficients. The estimated values were found to be in good agreement with the measured values provided corrections were made for the interactions of H + with SO 2− 4. It now is possible to use dilute solutions of TRIS and TRISH + to make buffers that can be used to make reproducible pH measurements in brines.
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