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|Title:||Highly selective derivative spectrophotometric determination of palladium(II) in hydrogenation catalysts and alloy samples|
Khadar, A M A
|Abstract:||A simple, selective and sensitive derivative spectrophotometric method has been developed for the determination of palladium(II) using a newly synthesised reagent diacetylmonoxime-(p-anisyl)-thiosemicarbazone in acetic acid medium. The molar absorptivity and Sandell’s sensitivity of the coloured species are 3.8 × 10<sup>4 </sup>L mol<sup>-1 </sup>cm<sup>-1</sup> and 2.8 ng cm<sup>-2</sup>,<sup> </sup>respectively. Beer’s law is obeyed between 0.2-2.0 <img src='/image/spc_char/micro.gif' border=0>g mL<sup>-1</sup> of Pd(II) at 440 nm. The stoichiometry of the complex is found to be 1:2 (metal:ligand). Calibration graph for the first order derivative spectrophotometric determination of palladium(II) is derived by measuring derivative amplitudes at 480 nm with a linear range 0.15-2.6 mg <img src='/image/spc_char/micro.gif' border=0>L<sup>-1</sup>. The metal ions, which are normally associated with palladium in mineral and alloy samples, do not interfere. The proposed method has been successfully applied for the trace level determination of palladium in hydrogenation catalysts and some synthetic mixtures.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.18(3) [May 2011]|
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