1965 Volume 38 Issue 10 Pages 1696-1699
A spectrophotometric method has been developed for the determination of palladium-(II) at microgram levels; the method is based on the colour reaction with 2-thenoyltrifluoroacetone (TTA) in methyl propyl ketone (MPK). The bright orange-yellow-coloured palladium(II)-TTA chelate solution follows Beer’s law at 430 mμ over the 0.6–6.0 γ range of palladium(II) per millilitre. At pH values from 3.4 to 4.9, about 80% or more of palladium(II) is removed from an aqueous solution of TTA-MPK in a single extraction. The coloured system is stable for 72 hr. It can tolerate lead(II), thallium(I), cadmium(II), antimony(III), bismuth(III), platinum(IV), aluminium(III), zinc(II), nickel(II), zirconium-(IV), phosphate, chromate, acetate and sulphate, whereas tin(IV), manganese(II), cobalt(II), ascorbate, oxalate, citrate, tartarate and cyanide seriously interfere. Mercury(II), thorium(IV), calcium(II), strontium(II), barium(II), magnesium(II), vanadate and tungstate are moderately tolerated. The method is accurate and reproducible to within ±1.5%, and it offers a simple procedure for the simultaneous extraction and spectrophotometric determination of palladium(II).
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