Abstract

Two titrimetric methods for the determination of complex cyanides of the elements of groups VIIIA, IB, and IIB are presented. The titrants are silver nitrate (using a silver/sulfide ion-selective indicating electrode) and cetylpyridinium chloride [using a poly(vinylchloride)/ dioctylphthalate-coated graphite indicating electrode]. Silver nitrate can be used for all the complexes with the exception of Zn(CN) 4 staggered 2− and Hg(CN) 4 staggered 2−, which react too slowly with silver. In many cases the sequential titration of free cyanide, complex cyanide, and free halide is feasible with silver nitrate, although the results are less accurate for the complex cyanide because of coprecipitation. Cetylpyridinium chloride can be used for all the complex cyanides tested with the exception of Ag(CN) 2 staggered − and Au(CN) 2 staggered −. Halides and free cyanide do not interfere with determinations using this titrant.

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