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Title: Selective complexometric determination of palladium with sodium metabisulphite as releasing agent
Authors: Shetty, P.
Shetty, A.N.
Issue Date: 2009
Citation: Indian Journal of Chemical Technology, 2009, Vol.16, 3, pp.259-264
Abstract: Sodium metabisulphite has been proposed as a selective releasing agent for the rapid and selective complexometric determination of palladium. Pd(II) present in a given sample solution is first complexed with excess of EDTA and the surplus EDTA is back titrated with standard zinc sulphate solution at pH 5-5.5 (acetic acid-sodium acetate buffer) using xylenol orange as indicator. Sodium metabisulphite solution is then added to displace EDTA quantitatively from the Pd-EDTA complex. The released EDTA is back titrated with standard zinc sulphate solution as before. The method works well in the concentration range 2-20 mg of Pd with a relative error ? 0.40% and relative standard deviation ? 0.65%. The method has been applied to the determination of palladium in catalysts, alloys and complexes.
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