Determination of trace copper by dithizone photometry

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  • ジチゾンによる銅の定量法
  • ジチゾン ニ ヨル ドウ ノ テイリョウホウ
  • 微量金属のジチゾンクロマトグラフ分析法(第8報)

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Description

A dithizone chromatographic method had been Originally deviced to determine simultaneously the microgram quantities of nickel, cobalt, zinc and copper in rocks using less than 0.1 g samples. However the chromatographic method for copper was not practical because of the difficultness of elution.<BR>A direct extraction photometry with dithizone from dilute sulfuric acid solution was available for the determination of trace copper in the range 1 to 40 μg in the final volume 10 ml. The extraction of copper as dithizonate into carbon-tetrachloride was studied for concentrations of sulfuric acid, hydrochloric acid and dithizone. For the trace amount of copper, conc. dithizone solution should be used for extraction from sulfuric acid solution.<BR>The absorbance should be measured at 730 mμ against reagent blank. In the presence of 10 mg bismuth the direct extraction photometry of trace copper with dithizone (2 × 10-3M ) from 6N sulfuric acid gave 10% lower values than that from the standard method. In the presence of 15 μg of silver, trace copper could determined by measur-ing the absorbance at 531.5 mμ as the isosbestic point.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 10 (7), 688-692, 1961

    The Japan Society for Analytical Chemistry

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