原子吸光分析による微量バナジウムの間接定量

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Recently the authors found that vanadium exhibits a marked depressive interference on the chromium absorption when the solution containing vanadium, chromium, and hydroxylamine is nebulized in an air-acetylene flame. This phenomenon was applied to the indirect determination of vanadium. A sample containing 25300 μg of vanadium was taken in a 50 ml volumetric flask, and 5 ml of 250 μg/ ml of chromium, 5 ml of hydroxylamine hydrochloride solution (1.4M), and 2.5 ml of hydrochloric acid (1 M) were added to it, then the mixture was diluted to 50 ml with water. The solution was nebulized in the flame, and the chromium absorption was measured. The following conditions were used : lamp current, 10 mA; air flow, 6.6 l/min; acetylene flow, 1.6 l/min. The height in the flame at which the measurements were made was 8 mm above the burner top. The chromium line used was 3579 Å. A small amount (0.56 μg/ml) of vanadium has been successfully determined by this method. The sensitivity of the method was 0.2 μg/ml.
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