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Potentiometric determination of monohydrogen arsenate by zeolite-modified carbon-paste electrode

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A new carbon-paste electrode, based on natural zeolite (clinoptiolite) modified by the Fe2+ ion as carrier, was developed. The electrode exhibits a linear response to monohydrogen arsenate over a wide concentration range (5.0 × 10-8-1.0 × 10-3 M) with a Nernstian slope of -28.3 ± 1.0 mV per decade (r2 = 0.9998). The limit of detection was 3.0 × 10-8 M. It has a fast response time 5-10 s and can be used for more than 2 months. Selectivity coefficients determined by the fixed interference method indicate that a good discriminating ability towards monohydrogen arsenate ion in comparison with other anions. The monohydrogen arsenate-selective electrode could be used in the pH range of 7.0-11.0. This chemically modified carbon-paste electrode was successfully used for the determination of arsenic in water and wastewater samples.
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Keywords: HAsO42-; Potentiometry; Zeolite; Zeolite carbon-paste electrode

Document Type: Research Article

Affiliations: 1: Faculty of Science, Department of Chemistry, Yazd University, Yazd, Iran 2: Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran 3: Faculty of Science, Department of Chemistry, Tarbiat Moalem University, Tehran, Iran 4: Jaber Ibn Hayan Research Labs, Atomic Energy Organization of Iran, Tehran, Iran

Publication date: April 1, 2007

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