Extraction And Spectrophotometric Determination Of Palladium (II) And Its Separation From Nickel (II) Using Isonitrosopropiophenone Thiosemicarbazone As An Analytical Reagent

摘要

The present work deals with extraction and Spectrophotometric determination of palladium (II) and its separation from nickel (II) by using isonitrosopropiophenone thiosemicarbazone (HINPTC). The method is based on instantaneous formation of a stable reddish orange coloured complex with palladium (II) at room temperature in the pH range 1.0-8.0, selectively extracted in chloroform. The extracted species exhibit an absorption maximum at 365 nm where absorption due to similarly prepared reagent blank is negligible. The Beer's law is obeyed in the concentration range 0.5-4.0 μg/cm~3. The molar absorptivity and Sandell's sensitivity have been determined. The various experimental parameters have been optimized by studying effect of pH, solvents, reagent concentration, time of equilibration and tolerance limit of the method towards various cations and anions usually associated with palladium. The composition of the extracted species has been determined by mole ratio method and confirmed by Job's continuation variation method. The metal : ligand ratio is found to be 1:2. The proposed method is rapid, sensitive, and reproducible and has been successfully used for the determination of traces of palladium in synthetic mixtures and real samples. The method has also been used for the separation of palladium (II) from nickel (II).