Abstract
The construction and the application of a silica gel based carbon-epoxy indicator electrode for the potentiometric determination of acids and bases are described. The effect of composition of silica gel and carbon-epoxy, slope (mV/pH), linear response (pH range) and the use for acid-base titrations were investigated. The data obtained for the acid-base titrations were compared with those obtained using a glass electrode in the same conditions. The electrode showed a linear response in the pH 2 to 13 range with a slope of –40.5 ± 0.4 mV/pH (at 25 °C) and a response time of less than 15 s. The lifetime of the electrode was higher than one year (over 6000 determinations) with a decrease of only 5% of the initial potentiometric response. The silica gel based carbon-epoxy electrode showed excellent results in the end-point indication potentiometric titrations in determination of acids and bases. The miniaturization of the proposed electrode for flow injection analysis was investigated.
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Received: 11 August 1999 / Revised: 4 October 1999 / Accepted: 7 October 1999
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Teixeira, M., Ramos, L., Almeida Neves, E. et al. Potentiometric determination of acids and bases using a silica gel based carbon-epoxy indicator electrode. Fresenius J Anal Chem 367, 86–89 (2000). https://doi.org/10.1007/s002160051604
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DOI: https://doi.org/10.1007/s002160051604