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Extraction-polarography in an organic phase is very useful for the investigation of the extraction mechanisms. Polarographic behaviors of tetraethylammonium 1-pyrrolidinecarbodithioate (Et<SUB>4</SUB>Npcd) and iron (III)-1-pyrrolidinecarbodithioate (iron (III)-pcd) chelate were investigated in methyl isobutyl ketone (MIBK) containing 0.1 mol/l tetrabutylammonium perchlorate as a supporting electrolyte. Et4Npcd shows an oxidation wave at a dropping mercury electrode (DME) with the half-wave potential of 0.63 V vs. SCE. The oxidation process is diffusion- controlled with one electron transfer. A d. c. polarogram for iron (III) -pcd chelate in anhydrous MIBK shows one oxidation wave and one reduction wave at the DME. The half-wave potentials are- 0.07 and -0.62 V, respectively. The oxidation wave is due to the mercury dissolution by the iron (III) -pcd chelate and the reduction wave is due to the one electron reduction of iron (III) to iron (II) -pcd chelate. The cyclic voltammogram for the iron (III)-pcd chelate at the platinum disk electrode shows an oxidation wave to iron (IV) chelate and a reduction wave to iron(II) chelate. The peak potentials are about +O.5 V and -0.5 V, respectively. Iron (III) is quantitatively extracted from a citrate buffer with Et<SUB>4</SUB>Npcd into MIBK in the pH range above 4.0. From the polarography in the extract, it was found that pcd and citric acid are co-extracted with the iron (III)-pcd chelate and that the iron (III) chelate and pcd are slowly decomposed.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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