Investigations of the extraction equilibrium of ternary ion-association complexes of thallium(III) with ditetrazolium salts, neo-tetrazolium chloride and nitrobluetetrazolium chloride

The extraction equilibrium of ternary ion-association complexes formed between the tetrachloro complexes of thallium(III) and ditetrazolium salts, neotetrazolium chloride (NTC)[2,2',5,5'-tetraphenyl-3-3'-(p-biphenylene)ditetrazolium chloride] and nitrobluetetrazolium chloride (NBT)[3,3'-dianizole-4,4'-bis-2-(4-nitrophenyl-5-phenyltetrazolium chloride)] has been studied. As a result, the extraction constants, the distribution constants, the association constants, the distribution coefficients of thallium(III) and the extraction indicators R have been calculated. The results have been evaluated statistically. The relative standard deviations Ssub(r) have been calculated at a statistical certainty of 95%. The ratio ditetrazolium salts/TlCl4-=1:2 has been confirmed once again. (author)