Solvent extraction of thiocyanate complexes of cobalt(II) by 2-benzylpyridine/benzene from aqueous acid solutions |
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| Authors: | S Zuha A Rusheed |
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| Institution: | (1) Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad, Pakistan |
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| Abstract: | Selective separation of Co(II) from aqueous acidic solutions containing thiocyanate ions has been achieved by using 2-benzylpyridine (BPy) dissolved in benzene. Optimum conditions of extraction by 0.1M BPy are: 0.05M (HCl, HNO3) or 0.01M H2SO4+1 M KSCN. Ascorbate and sulfate ions do not affect the extraction of cobalt(II), whereas acetate, citrate and oxalate ions lower the extraction. Separation of cobalt(II) from Mn, Cr, Hf, Fe, Y, Ce, Cd, Sr, Cs and several rare earth elements can be achieved in a single extraction. Slope analysis by log-log plot reveals that neutral cobalt-thiocyanate species is extracted with the probable formula of the extracted complex as Co(BPY)3 (SCN)2. |
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