ION-TRANSFER CURRENT-SCAN POLAROGRAPHIC STUDIES OF METAL EXTRACTANTS WITH ASCENDING WATER ELECTRODE - TRANSFER OF DIVALENT METAL-ION COMPLEXES OF PHENANTHROLINES ACROSS A LIQUID-LIQUID INTERFACE

被引:20
作者
DOE, H [1 ]
FREISER, H [1 ]
机构
[1] UNIV ARIZONA, DEPT CHEM, STRATEG MET RECOVERY RES FACIL, TUCSON, AZ 85721 USA
关键词
CURRENT-SCAN POLAROGRAPHY; ASCENDING WATER ELECTRODE; ION TRANSFER; DIVALENT METAL-PHENANTHROLINE COMPLEX ION;
D O I
10.2116/analsci.7.313
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The transfer mechanism of Ni2+, Co2+, Zn2+ and Cd2+ ions from an aqueous to a dichloroethane (DCE) solution of phenanthroline derivatives (Phen) was studied. Included were 1,10-phenanthroline (phen), 4,7-dimethyl-1,10-phenanthroline (4,7-DMP), 4,7-diphenyl-1,10-phenanthroline (4,7-DPP) and 2,9-dimethyl-1,10-phenanthroline (2,9-DMP). The investigation was carried out by current-scan polarography at the ascending water electrode (AWE). Some polarographic waves were observed that can be attributed to the slow formation of 1:1 M2+-Phen complexes. In some cases, as with the Ni2+-Phen systems and the Co2+-4,7-DPP system, no wave was observed, because the complexation rates are too slow. All of the Cd2+-Phen and all of the Zn2+-Phen systems, except for the Zn2+-4,7-DPP system which exhibits a kinetic wave, yielded diffusion-controlled waves. Furthermore, a number of these systems appear to be affected by significant interfacial adsorption of the M2+-Phen complexes.
引用
收藏
页码:313 / 319
页数:7
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