希薄なバリウム, ストロンチウムイオン濃度における硫酸塩混晶の生成
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概要
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In the presence of sulfamic acid with various concentrations, the pure and the mixed sulfates of barium and strontium ions are precipitated by the KCP reaction. The concentrations of su]famic acid are used against those of barium and strontium ions from equimolar to suffic1ent excess molar, and the concentration ratios of barium ion to the various concentrations of strontium ion are changed variously. At the equimolar reaction, the precipitates of strontium sulfate in the mixed precipitates are not observed in the lowerest concentrations of barium and strontiurn ions, but they are slightly observed in the lower concentrations of those ions. Those of barium sulfate increase at initial stage of reaction independent of concentrations of barium ion (Figs. 5 and 6). At the simultaneous reaction, the quantity of strontium sulfate in the mixed precipitates decreases at the initial stage of reaction compared to the single reaction, but it increases at the following stage of reaction. The increasing of strontium sulfate is due to the promotion of the precipitation reaction of strontium sulfate by the precipitate of barium sulfate formed at the initial stage. The prectpitation molar fractions of strontium sulfate in the mixed precipitates obtained by the excess molar reaction become larger than the theoretical values with decrease in the concentrations of strontium ion. These fractions grow larger with increase in the concentrations of barium ion (Figs. 7 and 8), and with decrease in the concentrations of barium ion in the case of the same concentration of sulfamic acid (Figs. 9 and 10). The heterogeneous distribution coefficients (λ) of barium-strontium mixed sulfates in the presence of suifamic acid with various concentrations are also determined by the several analytical mehtods in the previous paper. The results obtained by the above methods are shown in the relation between λ and the concentrations of barium ion (Tables 3 and 4). The average values of λ in table 3 are in satisfactory agreement with theoretical values of λ on lower concentration of strontium ion, and those of λ in table 4 are larger than that of λ on the lowerest cocnentration of strontium ion.
- 山形大学の論文
- 1978-02-20
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