Spectrophotometric Determination of Trace Amounts of Tungsten(VI) Based on Its Inhibitory Effect for the Red Intermediate Formation on the Iron(II) Catalyzed Chlorpromazine-Hydrogen Peroxide Reaction.

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  • Spectrophotometric Determination of Tra

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Abstract

A catalytic spectrophotometric method for the determination of traces of tungsten(VI) is proposed. In the presence of iron(II), chlorpromazine (CP) is oxidized by hydrogen peroxide in a hydrochloric acid solution to form a red free radical, which is further oxidized to a colorless compound. The reaction can be followed by measuring the increase in absorbance of the red free radical at 525nm; the maximum absorbance is obtained on an absorbance/time curve at a given reaction time. Tungsten(VI) inhibits the color formation and the maximum absorbance value decreases with an increase in the tungsten(VI) concentration. Thus, the maximum value is used as a parameter for the tungsten(VI) determination. Under the optimum experimental conditions (7.6×10-2M hydrochloric acid, 4.9×10-3M hydrogen peroxide, 2.5×10-4M CP, 1.4×10-4M Iron(II), 35°C), tungsten(VI) can be determined in the range from 2 to 500μg l-1. The relative standard deviations are 0.7, 0.2 and 1.7% for 100, 20 and 6μg l-1, respectively. This method was successfully applied to a determination of tungsten(VI) in hot spring water samples.

Journal

  • Analytical Sciences

    Analytical Sciences 12 (6), 899-903, 1996

    The Japan Society for Analytical Chemistry

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