Premium
Estimating the Change in Liquid Junction Potential on Glass Electrodes
Author(s) -
Brandariz Isabel,
Barriada José L.,
TaboadaPan Carlos,
de Vicente Manuel E. Sastre
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200109)13:13<1110::aid-elan1110>3.0.co;2-2
Subject(s) - electrolyte , thermodynamics , electrode , glass electrode , activity coefficient , electrode potential , materials science , asymmetry , ionic bonding , stoichiometry , analytical chemistry (journal) , ionic strength , chemistry , reference electrode , ion , physics , organic chemistry , quantum mechanics , chromatography , aqueous solution
Formal potential of combination glass electrodes, a necessary parameter commonly needed in the determination of stoichiometric equilibrium constants, has been calculated at several temperatures and ionic strength values. These data, together with the activity coefficient of the proton calculated with Pitzer equations, have been used to study the change in the liquid junction potential, E j . Since the asymmetry potential is unknown, absolute values of E j can not be calculated. However, it has been possible to determine the variation as a function of the ionic strength in KCl as background electrolyte. A linear relationship has been found for the three temperatures studied. Dependence with temperature of the term – s log m H + represents the most important influence on the temperature dependence of the formal potential of a combination glass electrode.