Voltammetric determination of nitrate with a modified carbon paste electrode

Voltammetric determination of nitrate with a modified carbon paste electrode

A method for the voltammetric determination of nitrate in drinking water is presented. Nitrate exerts a catalytic effect on the reduction and reoxidation of thallium (1 ↔ 0) in cyclic and differential pulse voltammetry, leading to a peak enhancement. Nitrate can be preconcentrated together with tetr...

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Veröffentlicht in:Electroanalysis (New York, N.Y.) N.Y.), 1994-03, Vol.6 (3), p.227-236
Hauptverfasser: Neuhold, Christian, Kalcher, Kurt, Diewald, Wolfgang, Cai, Xiaohua, Raber, Georg
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Carbon paste
Modified electrodes catalysis
Nitrate
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container_end_page 236
container_issue 3
container_start_page 227
container_title Electroanalysis (New York, N.Y.)
container_volume 6
creator Neuhold, Christian
Kalcher, Kurt
Diewald, Wolfgang
Cai, Xiaohua
Raber, Georg
description A method for the voltammetric determination of nitrate in drinking water is presented. Nitrate exerts a catalytic effect on the reduction and reoxidation of thallium (1 ↔ 0) in cyclic and differential pulse voltammetry, leading to a peak enhancement. Nitrate can be preconcentrated together with tetrachlorothallate(III) from hydrochloric acid solutions onto a carbon paste electrode modified with a liquid anion exchanger. (Amberlite LA2) under open circuit conditions. After reduction of the Tl(III) to Tl(0) at the electrode surface at a potential of −1.2 V (vs. SCE), the increase of the reoxidation current of Tl(III) to TI(I) by nitrate is exploited for analytical purposes. Linearity between current and concentration exists for 0.5 to 60 μg · mL−1 nitrate when applying anodic differential pulse vokammetry. Mechanical regeneration of the electrode surface is necessary after each measurement. The interference of other anions and the influence of methodical parameters are invistigated. The applicability of this method for the determination of nitrate in drinking wat concise overview on the the electroanalytical techniques for the Quantitative determination of nitrate is also presented.
doi_str_mv 10.1002/elan.1140060309
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subjects Carbon paste
Modified electrodes catalysis
Nitrate
title Voltammetric determination of nitrate with a modified carbon paste electrode
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