The spectrophotometric determination of molybdenum-containing compounds in aqueous glucose solutions using pyrazine-2,3-dicarboxylic acid was investigated. Determination of the molybdenum complex with pyrazine-2,3-dicarboxylic acid was performed at l max = 550 nm. The light absorption of the deeply violet complex follows Lambert-Beer's law and can be measured with a molar absorptivity in the range of 4414-9020 L mol -1 cm -1 . The presented method is very sensitive and shows good reproducibility for the extinction values.
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