Use of the pitzer equations to examine the dissociation of TRIS in NaCl solutions

Frank J. Millero

Research output: Contribution to journalArticle

12 Scopus citations


The TRIS buffer system is frequently used to calibrate electrodes and indicators that are used to determine the pH of natural waters. Most of the potentiometrie and spectrophotometric systems used to measure the pH are calibrated with TRIS buffers. Since most natural waters contain high concentrations of NaCl, it is useful to be able to determine the pK of TRIS using ionic interaction models. In this paper, the dissociation constants of TRIS in NaCl solutions from (0 to 100) °C and (0 to 5) mol·kg -1 have been fitted to Pitzer equations. This allows one to estimate the values of the pH for TRIS buffers for natural brines over a wide range of conditions.

Original languageEnglish (US)
Pages (from-to)342-344
Number of pages3
JournalJournal of Chemical and Engineering Data
Issue number2
StatePublished - Feb 12 2009


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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