Potentiometric determination of monohydrogen arsenate by zeolite-modified carbon-paste electrode
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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Zeolite carbon-paste electrode
Document Type: Research Article
Faculty of Science, Department of Chemistry, Yazd University, Yazd, Iran
Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran
Faculty of Science, Department of Chemistry, Tarbiat Moalem University, Tehran, Iran
Jaber Ibn Hayan Research Labs, Atomic Energy Organization of Iran, Tehran, Iran
April 1, 2007
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