界面張力滴定によるイオンの定量

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The end point of the precipitation titration of sulfate ion with a stndard barium chloride solution was detected satisfactorily by using surface-active substances as indicator in the stalagmometric measurement of the surface tension between mercury and the solution. All experiments were carried out at a room temperature under an atmospheroc condition. The capillary characteristics at h=50cm were : m=1.122mgs^<-1> in pure water and td=6.46s at open circuit in O.1M NaCl in 1:2 H_2O-methanol mixture. Arsenazo III, sulfonazo III, neo-thorin, alizarin red S and dodecyl-benzenesulfonate (DBS) were examined as an indicator. In order to enhance the precipitation of barium sulfate, the titration was carred out in a H_2O-methanol mixture. The change of drop time near the equivalent point became larger with increasing amount of methanol. All indicators except DBS showed a distinct surface-activity in the 1:2 H_2O-methanol mixture. The drop time of a polarographic dropping mercury electrpde at 0 volt vs. SCE was plotted against the volumeof titrant. This method was compared statistically with the ordinary visual method using arsenazo III indicator. In the case of arsenazo III and sulfonazo III, the F-and t-tests showed that the variances and means of the stalagmometrical results did not differ significantly from those of the visual method. In the case of alizarin red S, there was a significant dfference in the variances. The Welch method revealed that there was no deviation from the mean obtained by the visualmethod. The titration was unsuccessful with neo-thorin and DBS as an indicator.
社団法人日本分析化学会の論文
1975-02-10

界面張力滴定によるイオンの定量

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