Determination of vanadium,molybdenum and tungsten in chloralkali electrolysis brines by x-ray fluorescence spectrometry |
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Authors: | J. Verbeeck B. Vanderborght R. Van Grieken G. Ex |
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Affiliation: | Department of Chemistry, University of Antwerp (UIA), B-2610 WilrijkBelgium;Central Analytical Laboratory, BASF-Antwerpen N.V., B-2050 AntwerpBelgium |
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Abstract: | The levels of vanadium, molybdenum and tungsten are critical in chloralkali electrolysis brines because these elements catalyze the hydrogen-producing side-reaction. Preconcentration by chelation with 8-quinolinol and subsequent adsorption on activated carbon, can be combined with energy- or wavelength-dispersive x-ray fluorescence. Under optimized conditions, the detection limits are in the μg 1-1 range, and below the critical levels. Up to 100 /smg l-1, reliable results are obtained for V, Mo and W. The coefficient of variation is typically 15% in the 25–100 μg l-1 range. |
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