Abstract
The reagent 2-mercapto-benzothiazole quantitatively precipitates palladium at a PH 5.6 to 10.2. The red coloured compound, Pd(C7H4NS2)2, is diamagnetic and is stable up to a temperature of 388‡ C. Palladium is separated from alkalis, alkaline earths, Mg, Fe3+, Cr, Th, Zr, Ti, UO2 2+, Be, rare earths, Ce3+, Ce4+, Zn, Mn, Co, Ni, Pb, Bi, Sb3+, As3+, Sn4+, Tl+, Cu2+, Cd, Ir4+, Rh3+, Ru3+, Os4+, CrO4 2−, MoO4 2−, WO4 2−, VO3 −, PO4 3− and AsO4 3− at apH 6–8 in presence of EDTA and tartaric or citric acid. Besides Pb, Ag and Hg2+ are kept in solution with potassium iodide and Au in a limited quantity forms a soluble complex with thiosulphate. The palladium complex is either weighed after drying and determined gravimetrically or dissolved in an excess of cyanide and determined volumetrically by back titrating the latter with silver nitrate.
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