Non-destructive method for the analysis of gold(I) cyanide plating baths Complexometric determination of nickel and indium.
A method is described for rapid determination of nickel and indium in gold(I) cyanide baths containing large amounts of citric acid and/or sodium citrate, without previous destruction of organic matter. Gold is removed by extraction with ethyl acetate. In one aliquot of the solution indium is masked with thioglycollic acid and nickel is precipitated with sodium diethyldithiocarbamate, extracted into chloroform, stripped into water and determined complexometrically. In a second aliquot indium and nickel are precipitated together with the same reagent and stripped into water, then nickel is masked with 1,10-phenanthroline, and indium is determined by direct titration with EDTA.
Pribil
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Laboratory of Analytical Chemistry J. Heyrovský Polarographic Institute Czechoslovak Academy of Sciences Prague 1, Jilská 16 Czechoslovakia.
Veselý
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