Studies on the Determination of Metals by Extraction Method of Metal Organic Compound. V : Determinations of Copper and Bismuth with Sodium Diethyldithiocarbamate

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The salt of copper and bismuth by sodium diethyldithiocarbamate were extracted completely with organic solvents and gave clear extracts, and its absorbancy was measured by the Beckman Model DU spectrophotometer to determine the amount of copper and bismuth. The organic solvents used were amyl acetate, carbon tetrachloride, benzene, toluene, xylene, chloroform, and amyl alcohol, of which a mixed solvent of amyl alcohol and ethyl acetate in the ratio 3 : 1 was found to be the best one for the extraction. The minimum determinable amount of copper was 1γ at the wave-1ength 440 mμ and that of bismuth was 10γ at 370 mμ, that is, the molecular extinction coefficient calculated for copper and bismuth in carbon tetrachloride were 16637 and 14296, respectively. By applying this method to the determination of copper in lead alloys, so small a content as 0.0002 per cent was successfully determined.
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