A rapid and sensitive extractive spectrophotometric determination of palladium(II) in synthetic mixtures and hydrogenation catalysts using pyridoxal-4-phenyl-3-thiosemicarbazone.

نویسندگان

  • L S Sarma
  • J R Kumar
  • K J Reddy
  • A K Kumar
  • A V Reddy
چکیده

A rapid and sensitive extractive spectrophotometric method has been developed for the determination of palladium(II) in synthetic mixtures and hydrogenation catalysts using pyridoxal-4-phenyl-3-thiosemicarbazone (PPT) as an analytical reagent. The reagent forms a red-color complex with the metal at pH 3.0, which is extracted into benzene. The absorbance is measured at 460 nm. The method adheres to Beer's law up to a concentration range of 0.4-6.4 microg cm(-3). The molar absorptivity and Sandell's sensitivity are 2.20 x 10(4) dm3 mol(-1) cm(-1) and 4.85 x 10(-3) microg cm(-2), respectively. The correlation coefficient of the Pd(II)-PPT complex is 0.99, which indicates an excellent linearity between two variables. The detection limit of this method is 0.05 microg cm(-3). The instability constant of the Pd(II)-PPT complex calculated from Edmond and Birnbaum's method is 2.90 x 10(-5) and that of Asmus' method is 2.80 x 10(-5) at room temperature. The concurrent repetition of the method is checked and the relative standard deviation (RSD) (n = 5) was derived as 1.84 percent. The present method was applied to the determination of palladium(II) in synthetic mixtures and hydrogenation catalysts. The results were compared by employing an atomic-absorption spectrometer.

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عنوان ژورنال:
  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

دوره 18 11  شماره 

صفحات  -

تاریخ انتشار 2002