Sodium dibutyldiselenocarbamate. Analytical application to the extraction spectrophotometry of heavy metals.
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概要
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Sodium dibutyldiselenocarbamate is soluble in water, and the form of its dibutyldiselenocarbamic acid is extractable by methylene dichloride; more than 99% of the reagent exists in the methylene dichloride phase in the pH region of 4–10. The reagent readily forms extractable chelates with Au<SUP>III</SUP>, Co<SUP>II</SUP>, Cu<SUP>II</SUP>, Hg<SUP>II</SUP>, Ni<SUP>II</SUP>, Pd<SUP>II</SUP>, and Zn<SUP>II</SUP> while it gives considerable white precipitates with Ag<SUP>I</SUP> and Hg<SUP>II</SUP> in the pH region of 1–7. Each chelate in methylene dichloride absorbs at wavelengths lower than 400 nm. The peak of the copper(II) chelate with the molar absorbtivity of 1.50×10<SUP>4</SUP> at 442 nm is not affected by the spectra of the reagent and other metal chelates, and it can be used for the selective spectrophotometric determination of copper(II) up to 0–10 μg/cm<SUP>3</SUP>.
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