TY - JOUR
T1 - Cobalt extraction by hdnns in the presence of an alpha-hydroxyoxime
AU - Osseo-Asare, K.
AU - Renninger, D. R.
AU - Wagner, J. D.
N1 - Funding Information:
Support of this work by the National Science Foundation under
PY - 1983/1/1
Y1 - 1983/1/1
N2 - The method of slope analysis has been used to analyze cobalt extraction by dinonylnapthalene sulfonic acid (HDNNS) in hexane/aqueous nitrate systems in the absence and presence of 0.01 mol. dm-3 5, 8-diethy1-7-hydroxy-6-dodecanone oxime (H2Ox; the active extractant in the commercial reagent, LIX63, a product of Henkel Corp.). In the absence of H2OX, cobalt is extracted by HDNNS micelles and the log D versus log [HDNNS] plot gives a slope of unity. In the presence of 0.01 mol-dm-3 H2Ox, the corresponding plot shows a maximum at 5.6x10-2 mol.dm-3 HDNNS and a minimum at 3x1010-2 mol.dm-3 HDNNS. At low HDNNS concentrations ≤ 5.6x10-3 mol.dm-3), the log D versus log [HDNNS] plot has a slope of 1.0 while at high HDNNS concentrations (≥ 3x10-2 mol-dm-3) cobalt distribution approaches that of the HDNNS-alone system. The HDNNS behavior in the presence of H2Ox is explained in terms of the presence of a mixed oxime-sulfonate micelle whose concentration goes through a maximum as HDNNS concentration is increased. The pH dependence of log D expected from the slope analysis (i.e. a slope of 2.0 for a log D vs pH plot) is masked by the presence of an H+/K+ cation exchange between HDNNS and the aqueous KNO supporting electrolyte.
AB - The method of slope analysis has been used to analyze cobalt extraction by dinonylnapthalene sulfonic acid (HDNNS) in hexane/aqueous nitrate systems in the absence and presence of 0.01 mol. dm-3 5, 8-diethy1-7-hydroxy-6-dodecanone oxime (H2Ox; the active extractant in the commercial reagent, LIX63, a product of Henkel Corp.). In the absence of H2OX, cobalt is extracted by HDNNS micelles and the log D versus log [HDNNS] plot gives a slope of unity. In the presence of 0.01 mol-dm-3 H2Ox, the corresponding plot shows a maximum at 5.6x10-2 mol.dm-3 HDNNS and a minimum at 3x1010-2 mol.dm-3 HDNNS. At low HDNNS concentrations ≤ 5.6x10-3 mol.dm-3), the log D versus log [HDNNS] plot has a slope of 1.0 while at high HDNNS concentrations (≥ 3x10-2 mol-dm-3) cobalt distribution approaches that of the HDNNS-alone system. The HDNNS behavior in the presence of H2Ox is explained in terms of the presence of a mixed oxime-sulfonate micelle whose concentration goes through a maximum as HDNNS concentration is increased. The pH dependence of log D expected from the slope analysis (i.e. a slope of 2.0 for a log D vs pH plot) is masked by the presence of an H+/K+ cation exchange between HDNNS and the aqueous KNO supporting electrolyte.
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U2 - 10.1080/07366298308918405
DO - 10.1080/07366298308918405
M3 - Comment/debate
AN - SCOPUS:84972948536
SN - 0736-6299
VL - 1
SP - 337
EP - 347
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 2
ER -