Any junction between two electrolyte solutions of different composition. Across such
a junction there arises a potential difference, called the liquid junction potential.
In the operational pH cell
the junction is between the test, or pH standard
, solution and the filling solution
or the bridge solution
of the reference electrode
PAC, 1985, 57, 531
(Definition of pH scales, standard reference values, measurement of pH and related
terminology (Recommendations 1984))
on page 541
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook