dc.contributor.author |
Billing, Caren
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dc.contributor.author |
Cukrowski, Ignacy
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dc.date.accessioned |
2010-04-06T07:02:17Z |
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dc.date.available |
2010-04-06T07:02:17Z |
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dc.date.issued |
2009-09 |
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dc.description.abstract |
A glass electrode (GE) can be successfully employed to measure pH in the study of metal-ligand equilibria by voltammetry at extremely low pH (between 0 and 2); two consecutive strong acid–strong base titrations involving different base concentrations (recommended to avoid corrosion of the GE in very basic solutions) are best suited to establish the response parameters of a GE. A novel approach of using a combined linear and binomial GE calibration was developed; this procedure allows measurements between pH 0 and 2 with uncertainty better than ±0.01 pH unit. From an extensive error analysis, it has been established that the uncertainties of about ±0.5 mV in the response slope and ±1.3 mV in E°’ might result in an absolute error in pH of about 0.02
which should not generate errors larger than 0.3%in optimized stability constants (as logKvalues) determined by voltammetry at extremely low pH. A test of GE suitability for the study of metal complexes by voltammetry is also proposed; it should be implemented only for suspect electrodes that show response parameters outside the limits recommended in this work. |
en |
dc.identifier.citation |
Billing, C & Cukrowski, I 2009, 'Glass electrode calibration for use in the voltammetric determination of stability constants under extreme acidic conditions', South African Journal of Chemistry, vol. 62, pp. 168-178. [http://journals.sabinet.co.za/sajchem/] |
en |
dc.identifier.issn |
0379-4350 |
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dc.identifier.uri |
http://hdl.handle.net/2263/13774 |
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dc.language.iso |
en |
en |
dc.publisher |
South African Chemical Institute |
en |
dc.rights |
South African Chemical Institute |
en |
dc.subject |
Glass electrode calibration |
en |
dc.subject |
Glass electrode performance |
en |
dc.subject |
Metal-ligand equilibria studies |
en |
dc.subject.lcsh |
Electrodes, Glass -- Calibration |
en |
dc.subject.lcsh |
Voltammetry |
en |
dc.subject.lcsh |
Potentiometry |
en |
dc.title |
Glass electrode calibration for use in the voltammetric determination of stability constants under extreme acidic conditions |
en |
dc.type |
Article |
en |