Studies of the Alkaline Earth Complexes in Various Solutions. VI. The Extraction and Complex Formation of Beryllium(II) in Sodium Perchlorate Media Containing Some Univalent Inorganic Anions

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Abstract
The distribution of beryllium(II) between methylisobutylketone containing TTA (thenoyltrifluoroacetone) and aqueous 4.0 m sodium perchlorate constant ionic media has been measured by using a carrier-free beryllium-7 tracer. The distribution behavior, determined as a function of the TTA and the hydrogen ion concentration, was explained in terms of the extraction of the Be(TTA)2, the Be(ClO4)2 and the mixed species Be(TTA)-(ClO4), and their extraction constants were determined. Then, the stability constants for the chloride, bromide, and nitrate complexes were determined from the decrease in the TTA extraction when some of the perchlorate ions in the aqueous phase were replaced by the ligand anions. Those of the thiocyanate complexes, on the other hand, were determined from the extraction of Be(SCN)2 species with TBP (tributylphosphate) in hexane. It was concluded that the stabilities of these complexes are very low; the values β1 and β2 range between 1 and 0.1, but still these complexes should be taken into account in any discussion of the chemical behavior under some experimental conditions.