Solvation of cobalt-thiocyanate complexes by 2-hexylpyridine from aqueous mineral acid solutions |
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| Authors: | Shamas-Ud-Zuha Madassar A Qureshi M Ejaz |
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| Institution: | (1) Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Rawalpindi, Pakistan |
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| Abstract: | A study of the distribution of cobalt between mineral acid solutions containing potassium thiocyanate and 0.1M 2-hexylpyridine
in benzene has been undertaken. Cobalt can be quantitatively extracted as its thiocyanate complex from very dilute acid solutions
containing 0.1–1M KSCN. Variation of the distribution coefficient DCo in terms of the ligand concentration in the organic phase has allowed the formula of the extracted species to be determined
as Co(HPy)4 (SCN)2. The effects of oxalate, acetate, fluoride, ascorbate, sulphate and thiosulphate ions on the extraction of cobalt from three
mineral acid solutions have been reported. The extraction coefficients of several elements are given for the 0.1M 2-hexylpyridine
in three systems containing 0.5M KSCN with 0.25M HNO3, 0.05M HCl and 0.05M H2SO4 respectively; and their factors for separation from cobalt are estimated. |
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