陰イオン交換紙による無機陰イオンの電気泳動

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For the purpose of the separation of common inorganic anions, their electrophoretic behaviors were examined on the anion-exchange paper, Amberlite WB-2 (weak base) and SB-2 (strong base). The electrophoresis was carried out on the anion-exchange paper of 2.5 × 4.5 cm size under the constant current densities, using H3PO4-Na2HPO4 and CH3CO2HCH3CO2Na buffer solutions of pH 4 and 7 (total concentration was 0.5M) as supporting electrolytes. A migration distance of ion varies with the position of starting point and other conditions. In the preliminary experiments the conditions which gave the reproducible migration distance were found, thereafter the following conditions were employed: starting point of migration; 7.5 cm from cathode electrolyte, current density; 20 mA/2.5 cm (paper width), migration time; 60 min. Although the electromigration distance of anion on the anion-exchange paper was less than that on the filter paper, each ion could be detected easier in the former case compared to the latter because of the smaller spot area. Since the anion-exchange resin impregnated in paper has a restraining effect on the migration of anion, anion migrates more on WB-2 than on SB-2, and the anion having the lower selectivity coefficient on the anion-exchange resin migrates more than that having the higher one. The results obtained in the single ion migration of 20 species of common anions suggested the possibility of mutual separation of the following anions within the shown groups: (1) F-, Cl-, Br-, I-; (2) Cl-, ClO-, ClO3-, ClO4-; (3) SO32- S2O32-, SO42-; (4) NO2-, NO3-. The relative migration rate, Rm (migration distance of any ion, dx/migration distance of Cl-, dCl)of each ion in the mixed solutions agreed to that in the single ion migration. The order of Rm values of halide ions was F->Cl->Br->I- on SB-2 irrespective of supporting electrolyte, and was Cl->Br->F->I- on WB-2 and phosphatic electrolyte. The high Rm value of F- on SB-2 may be attributed to its low selectivity coefficient on the strong base anionexchange resin. On the weak base WB-2 the order of Rm values of halide ions was some intermediate between those on the strong base SB-2 and the filter paper, implying that the migration was controlled by both the ionic mobility and the selectivity coefficient. Halide ion in the mixed solutions could be separated and identified satisfactorily on both WB-2 and SB-2, but the best separation was obtained on WB-2 and phosphatic electrolyte.
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陰イオン交換紙による無機陰イオンの電気泳動

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