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Specific Anion effects on glass electrode pH measurements of Buffer solutions: Bulk and surface phenomena

Salis, Andrea; Pinna, M Cristina; Bilanicova, Dagmar; Monduzzi, Maura; Lo Nostro, Pierandrea; Ninham, Barry


The effect of electrolytes on pH measurements via glass electrodes is explored with solutions buffered at pH 7 (phosphate and cacodylate). Salt and buffer concentrations are varied. Direct and reverse Hofmeister effects are observed. The phenomena are significant for salt concentrations above 0.1 M and for buffer concentrations below 20 mM. Changes in measured pH show up most strongly with anions. They can be related to the usual physicochemical parameters (anion molar volumes, molar...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Journal of Physical Chemistry B
DOI: 10.1021/jp0546296


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