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• W1966227410 endingPage "1656" @default.
• W1966227410 startingPage "1649" @default.
• W1966227410 abstract "A highly sensitive and fast responding sensor for the determination of thiosulfate, sulfite, sulfide and dithionite is described. It consists of a chemically modified carbon ceramic composite electrode (CCE) containing [Ru(bpy)(tpy)Cl]PF6 complex that was constructed by the sol-gel technique. A reversible redox couple of Ru(II)/Ru(III) was observed as a solute in acetonitrile solution and as a component of carbon based conducting composite electrode. Electrochemical behavior and stability of modified CCE were investigated by cyclic voltametry, the apparent electron transfer rate constant (kappa(S)) and transfer coefficient (a) were determined by cyclic voltametry which were about 28 s(-1) and 0.43 respectively. Electrocatalytic oxidation of S(2-), SO3(2-), S2O4(2-) and S2O3(2-) were effective at the modified electrode at significantly reduced overpotentials and in the pH range 1-11. Optimum pH values for amperometric detection of thiosulfate, dithionite, sulfide and sulfite are 7, 9, 2 and 2. Under the optimized conditions the calibration curves are linear in the concentration ranges 1-500, 3-80, 2-90 and 1-100 microM for S2O3(2-), SO3(2-), S2- and S2O4(2-) determination. The detection limit (signal to noise is 3) and sensitivity are 0.5 and 12, 2.8 and 6, 1.6 and 8, and 0.65 microM and 80 nA microM(-1) for thiosulfate, sulfite, sulfide and dithionite detection. The modified carbon ceramic electrode doped with Ru-complex shows good reproducibility, a short response time (t < 2 s), remarkable long term stability (> 6 month) and especially good surface renewability by simple mechanical polishing (RSD for eight successive polishing is 2%). The advantages of this sulfur compound amperometric detector based on ruthenium doped CCE are high sensitivity, inherent stability at a broader pH range, excellent catalytic activity, less expense and simplicity of preparation in comparison with recently published papers. This sensor can be used as a chromatographic detector for analysis of sulfur derivatives." @default.
• W1966227410 created "2016-06-24" @default.
• W1966227410 creator A5019858620 @default.
• W1966227410 creator A5027489945 @default.
• W1966227410 creator A5077322748 @default.
• W1966227410 date "2002-01-01" @default.
• W1966227410 modified "2023-09-27" @default.
• W1966227410 title "Renewable-surface sol–gel derived carbon ceramic electrode fabricated by [Ru(bpy)(tpy)Cl]PF₆and its application as an amperometric sensor for sulfide and sulfur oxoanions" @default.
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• W1966227410 doi "https://doi.org/10.1039/b209194a" @default.
• W1966227410 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12537375" @default.
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