Studies on Determinations of Metals by Extraction Method of Metal Organic Compound. IV : Determinations of Cadmium and Arsenic with Sodium Diethyldithiocarbamate

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Cadmium and arsenic form white precipitate or turbidity with sodium diethyl-dithio-carbamate, and the precipitate or the turbidity was extracted completely with some organic solvents and gives clear extracts, and the transmittancy was measured successfully with Beckman model DU spectrophotometer at a suitable wave length. Cadmium complex with the reagent was extracted completely from the solution at from 2N of hydrochloric acid to pH 9.5 by carbon tetrachloride, chloroform, benzene, toluene and xylene. Trivalent arsenic complex was extracted completely from the solution at pH 3〜6 with these solvents. The most suitable absorbancy of the cadmium complex was given at the wave length of 440 mμ of the Beckman model DU spectrophotometer and that of the trivant arsenic complex was given at 340 mμ. From the linear relations of the extinctancy of the extract measured at the suitable wave length against the metal content, cadmium as small as 20γ and trivalent arsenic as small as 5γ were determined.
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