Aqueous electrolyte solution, which may be gelled, containing fixed concentration of hydrogen ions, e.g.
HCl
or a buffer solution, and a fixed concentration of the ion to which the
internal reference electrode is reversible, e.g. chloride ion in the case of silver-silver chloride, or calomel electrodes.
Source:
PAC, 1985, 57, 531
(Definition of pH scales, standard reference values, measurement of pH and related terminology (Recommendations 1984))
on page 540
Cite as:
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.
doi:10.1351/goldbook.
