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Potentiometric Determination of Silver Thiolate Formation Constants Using a Ag2S Electrode
Authors:Nicholas W H Adams  James R Kramer
Institution:(1) School of Geography and Geology, McMaster University Hamilton, Ontario, Canada, L8S 4M1
Abstract:Formation constants for silver thiolates were obtained by titration of the ligand in a constant temperature, ionic strength and pH medium and measuring the potential change at a Ag2S electrode. A non-linear equation was derived from which the first and second silver formation constants, beta1 and beta2prime, and the sulfide group acid dissociation constant, Kaprime, were determined. An overall estimate of the uncertainty in the derived parameters was obtained using a Monte Carlo approach. The procedure was compared to a previous work on AgHS°. Log beta1prime, log beta2prime and - log Kaprime results were obtained for cysteine (11.9 ± 0.5, 15.2 ± 0.4, 7.8 ± 0.1), glutathione (12.3 ± 0.3, 14.3 ± 0.8, 8.8 ± 0.3) and 3-mercaptopropanoic acid (12.0± 0.4, 14.0 ± 0.4, 10.5 ± 0.3) at 20 °C and 0.01 m ionic strength.
Keywords:Silver sulfide  thiols  formation constants
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