1,8-ナフタリンジチオールによるパラジウムの吸光光度定量

概要

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Palladium gives an orange-red color (maximum absorbance at 450 nm) with 1, 8-naphthalenedithiol in an aqueous ethanoic solution under the presence of hydrochloric acid and arabic gum. The color develops rapidly and is stable for one hour. This makes it possible to determine the palladium in the concentration range 0.2 to 7 ppm. The permissible concentration of diverse ions to 2 ppm of palladium is as follows: Hg, Cu, Fe, 0.5 ppm; Os, Ir, Ru, 5 ppm, all other common metal ions, 30 ppm; almost all common anions, 100 ppm. The recommended procedure for the determination of Pd(II) is as follows: To an solution containing about 30 μg of Pd(II) 1 ml of 0.1% arabic gum solution, 1 ml of 0.1% 1, 8-naphthalenedithiol ethanolic solution, 1 ml of 0.2 M hydrochloric acid and 4 ml of ethanol are added. It is diluted to 10.0 ml with deionized water. After the solution has stood for 10 minutes, the absorbance of the palladium(II)-1, 8-naphthalenedithiol solution is measured at 450 nm against the blank solution prepared by the same procedure of the determined solution.
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