90℃におけるS₂O^2-₃H₂O系電位-pH図

抄録

The potential and pH measurements of the S₂0^2-₃-H₂O system were carried out at 90°C by decreasing the pH of sulfate solutions (about lg-ion/l. S0^2-₄) containing dissolved sodium thiosulfate (1, 0.1 and 0.01mo1/l) by the aid of a rotating Pt electrode, a glass electrode and two reference electrodes (S. C. E.).
The results obtained were summarized in the potential-pH diagram (Fig. 4) and empirical potential-pH equations were presented and compared with those calculated at 100°C. It is considered that the measureed potentials corresponded to the potential for S₄0^2-₆/S₂O^2-₃ and that for S°/H₂S in the neutral region and acidic region where S₂O^2-₃decomposed, respectively.