title: Application of a sulphide-selective electrode in the absence of a pH-buffer.
abstract: Calibration of a sulphide electrode in the pH-range 9-12 has been studied as an e.m.f. vs. (pH - p[HS(-)]) 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.
authors.affiliation: Department of Inorganic and Analytical Chemistry, Kossuth University, H-4010 Debrecen, Hungary.
authors.forename: I
authors.initials: I
authors.lastname: Tóth
authors.forename: P
authors.initials: P
authors.lastname: Solymosi
authors.forename: Z
authors.initials: Z
authors.lastname: Szabó