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A Highly Sensitive and Selective Spectrophotometric Determination of Vanadium(V) Using 6-Chloro-3-hydroxy-7-methyl-2-(2-thienyl)-4H-chromen-4-one

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Abstract

A simple, rapid, highly sensitive and selective method for the extractive spectrophotometric determination of micro amounts of vanadium(V) has been worked out using 6-chloro-3-hydroxy-7-methyl-2-(2-thienyl)-4H-chromen-4-one (CHMTC) as a complexing agent in a weakly acidified (HCl, pH 0.84–1.09) medium. The greenish-yellow complex is quantitatively extractable into carbon tetrachloride, and shows maximum absorbance at 417–425 nm. The method obeys Beer’s law up to 0.9 m g V ml–1, having molar absorptivity and Sandell’s sensitivity of 8.26×104 dm3 mol–1 cm–1 and 0.0006 m g V cm–2, respectively. As many as 39 cations and 14 anions and/or complexing agents do not interfere. The method has good reproducibility and can be satisfactorily applied to the determination of vanadium in steels, reverberato-ry flue dust and water samples.

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  1. Department of Chemistry, Kurukshetra University, Kurukshetra-136 119, Haryana, India

    N. Agnihotri, R. Dass & Jaswant R. Mehta

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  1. N. Agnihotri
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  2. R. Dass
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  3. Jaswant R. Mehta
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Agnihotri, N., Dass, R. & Mehta, J.R. A Highly Sensitive and Selective Spectrophotometric Determination of Vanadium(V) Using 6-Chloro-3-hydroxy-7-methyl-2-(2-thienyl)-4H-chromen-4-one. ANAL. SCI. 15, 1261–1264 (1999). https://doi.org/10.2116/analsci.15.1261

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  • DOI: https://doi.org/10.2116/analsci.15.1261

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