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KMID : 1059519980420010036
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Journal of the Korean Chemical Society
1998 Volume.42 No. 1 p.36 ~ p.41
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Solvent Extraction and Flotation Techniques Using Metal-Dithizone Complexes (Ⅰ). Rate Promoting Effect of Thiocyanate Ion as Auxiliary Ligand on Extraction of Cobalt(Ⅱ) and Copper(Ⅱ)
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Choi Yoon-Seok
Choi Hee-Seon
Kim Young-Sang
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Abstract
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In this study, the extraction of Co(Ⅱ) and Cu(Ⅱ) into chloroform solution of dithizone, distribution ratios, extractabilities and extraction rate constants of the metal complexes were compared in each case with which thiocyanate ion was or not used as the auxiliary ligand. The use of the thiocyanate ion increased threefold the distribution ratio for Co(Ⅱ) complex in a basic solution and twofold for Cu(Ⅱ) complex in a wide pH range. And the extractability was also augmented from about 90 to 99% for Co(Ⅱ) and from 95 to 99% for Cu(Ⅱ) in a given period. The extraction rate constants were k1: 1.2×105, k2: 1.34×1017 mol-1dm3s-1 in case of Co(Ⅱ) and k1: 1.1×108, k2: 2.83×1010 mol-1dm3s-1 in case of Cu(Ⅱ) on the extraction of dithizonate complexes into chloroform solution.
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