Application of a sulphide-selective electrode in the absence of a pH-buffer |
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Authors: | Tóth I Solymosi P Szabó Z |
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Institution: | Department of Inorganic and Analytical Chemistry, Kossuth University, H-4010 Debrecen, Hungary. |
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Abstract: | Calibration of a sulphide electrode in the pH-range 9-12 has been studied as an e.m.f. vs. (pH - pHS(-)]) function by measuring e.m.f. and pH in parallel. Calibration can also be done in this pH range by using a differential amplifier with a three-electrode measuring cell (glass, sulphide-selective and reference electrodes). The effects of an antioxidant (ascorbic acid) and a complexing agent (DCTA) on the calibration of the glass-sulphide electrode cell at pH < 5 were studied. The applicability of this end-point indicator cell has been demonstrated for titrations of Ag(+), Pb(2+) and Bi(3+) with Na(2)S. |
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