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Extraction of Elements from Aqueous Thiocyanate Solutions by 2-Hexylpyridine in Benzene

The extraction equilibria of a few transition elements in a thiocyanate system with 2-hexylpyridine (HPy) and its analogs have been studied previously [1—3]. The information obtained by the authors in previous investigations suggested the possibility of the simultaneous group extraction of elements of similar properties e. g. copper, cobalt, zinc and mercury from aqueous mineral acid solutions containing thiocyanate ions. For this reason it was considered worth-while to investigate the regularities of the partition behaviour of these and several other elements in hydrochloric, nitric and sulphuric acid media, especially in presence of small amounts of thiocyanate ions, which could be useful for radioanalytical separations. In the present article a compilation of data is summarised for the hydrochloric acid media (0.01—10 M) in the presence of potassium thiocyanate (0.02 M).