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Interfacial Behavior of Thiosulfate on Mercury Electrode Under Voltammetric Conditions
Author(s) -
Novotný L.,
Krista J.
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199810)10:14<965::aid-elan965>3.0.co;2-8
Subject(s) - thiosulfate , chemistry , adsorption , mercury (programming language) , dropping mercury electrode , electrode , inorganic chemistry , electrochemistry , drop (telecommunication) , hanging mercury drop electrode , surface tension , analytical chemistry (journal) , voltammetry , chromatography , thermodynamics , sulfur , organic chemistry , telecommunications , physics , computer science , programming language
The connection between the electrosorption and the voltammetric behavior of S 2 O 3 2− is demonstrated. The electrosorption of thiosulfate on mercury electrode in 0.1 M acetate buffer (pH 4.4), especially at potentials between 0.0 V and −0.35 V (vs. SCE) has been studied using an electrocapillary controlled convection drop‐time technique. Strong adsorption of S 2 O 3 2− was confirmed exhibiting maximum changes of the surface tension of mercury around the potential E max = −60 mV, where the adsorption coefficient β amounted to 105.2 m 3 mol −1 . The fitting of experimental results with the Frumkin adsorption isotherm was carried out and the resulting adsorption and interaction parameters were evaluated. The strong adsorptivity of S 2 O 3 2− was in agreement with marked increase of the voltammetric peak with accumulation time and it confirmed its combined faradaic electrosorption origin.