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- Title
In situ detection of intermediates from the interaction of dissolved sulfide and manganese oxides with a platinum electrode in aqueous systems.
- Authors
Luo, Yao; Shen, Yougang; Liu, Lihu; Hong, Jun; Qiu, Guohong; Tan, Wenfeng; Liu, Fan; Croot, Peter
- Abstract
Dissolved sulfide can be oxidised by manganese oxides in supergene environments, while the intermediates including S0, S2O32- and SO32- are easily oxidised by oxygen in air, resulting in some experimental errors in conventional analyses. In this work, the electrochemical behaviours of HS-, S2O32- and SO32- on a platinum electrode were studied by cyclic voltammetry and constant potential electrolysis, and in situ detection of the intermediates was conducted in aqueous systems of HS- and manganese oxides. The results showed that HS- was first oxidised to S0, and then transformed to SO42-. The peak current for the oxidation of HS- to S0 had a positive linear correlation with the used starting HS- concentration. S2O32- and SO32- were directly electrochemically oxidised to SO42-. The oxidation current peak potentials at 0, 0.45 and 0.7 V were respectively observed for HS-, S2O32- and SO32- at pH 12.0. Cyclic voltammetry was conducted to monitor the redox processes of HS- and manganese oxides. The oxidation peak current of HS- to S0 decreased, and that of S2O32- to SO42- was observed to increase as the reaction proceeded. The rate of the decrease of the oxidation peak current of HS- indicated that the oxidation activity followed the order of birnessite > todorokite > manganite.
- Subjects
PLATINUM electrodes; OXIDATION of sulfides; MANGANESE oxides
- Publication
Environmental Chemistry (14482517), 2017, Vol 14, Issue 3, p178
- ISSN
1448-2517
- Publication type
Article
- DOI
10.1071/EN16204