Construction of an anion-selective electrode: Dichromate-selective electrode

A salicylate‐selective electrode based on calix[4]arene derivative was developed and its response characteristics were investigated. The optimum membrane composition was 1 % ionophore, 30 % PVC, 69 % DOS. The electrode exhibited a Nernstian slope of 58.8±0.5 mV/pSal in the range of 1.0×10−5–1.0×10−1 M with a detection limit of 4.3×10−6 M at pH 4.0, 20±1 °C. The potentiometric response of the electrode in the presence of different anions was investigated by the separate solution method. The lifetime was found at least 4 months, and its response time was 5–10 s. It was successfully used for the potentiometric determination of salicylate in pharmaceutical preparations.

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Salicylate Ion‐Selective Electrode Based on a Calix[4]arene as Ionophore

Ayanoğlu

Ertürün

Özel

et al. 2015

Electroanalysis

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Screen-printed sensor for batch and flow injection potentiometric chromium(VI) monitoring

et al. 2010

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A disposable screen-printed electrode was designed and evaluated for direct detection of chromium(VI) in batch and flow analysis. The carbon screen-printed electrode was modified with a graphite-epoxy composite. The optimal graphite-epoxy matrix contains 37.5% graphite powder, 12.5% diphenylcarbohydrazide, a selective compound for chromium(VI), and 50% epoxy resin. The principal analytical parameters of the potentiometric response in batch and flow analysis were optimized and calculated. The screen-printed sensor exhibits a response time of 20 +/- 1 s. In flow analysis, the analytical frequency of sampling is 70 injections per hour using 0.1 M NaNO(3) solution at pH 3 as the carrier, a flow rate of 2.5 mL.min(-1), and an injection sample volume of 0.50 mL. The sensor shows potentiometric responses that are very selective for chromium(VI) ions and optimal detection limits in both static mode (2.1 x 10(-7) M) and online analysis (9.4 x 10(-7) M). The disposable potentiometric sensor was employed to determine toxicity levels of chromium(VI) in mineral, tap, and river waters by flow-injection potentiometry and batch potentiometry. Chromium(VI) determination was also carried out with successful results in leachates from municipal solid waste landfills.

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A solid state Cr(VI) ion-selective electrode based on polypyrrole

2012

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We report on a graphite electrode onto which polypyrrole was electrodeposited and then doped with chromate ion. This electrode can serve as a Cr(VI)-selective solid-state electrode. Electropolymerization of pyrrole was performed potentiostatically at 0.80 V (vs. SCE) using battery graphite as the working electrode in a solution containing 0.10 M of pyrrole and 20 mM of chromate. A platinum wire was used as an auxiliary electrode. The new electrode displays high selectivity, a very wide dynamic range, a sufficiently fast response time and a good shelf lifetime. It shows a linear Nernstian response over 1.0×10 −6 to 1.0×10 −1 M concentration range (with a slope of 26.55±0.20 mV per log of concentration). The detection limit is 0.5 μM, and the pH optimum is 7.0.

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Construction of an anion-selective electrode: Dichromate-selective electrode

Cited by 21 publications

References 26 publications

Salicylate Ion‐Selective Electrode Based on a Calix[4]arene as Ionophore

Salicylate Ion‐Selective Electrode Based on a Calix[4]arene as Ionophore

Screen-printed sensor for batch and flow injection potentiometric chromium(VI) monitoring

A solid state Cr(VI) ion-selective electrode based on polypyrrole

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