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Anodic stripping voltammetry of sulphide at a nickel film: towards the development of a reagentless sensor |
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| Authors: | Giovanelli Debora Lawrence Nathan S Wilkins Shelley J Jiang Li Jones Timothy G J Compton Richard G |
| Institution: | a Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK b Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK c Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge CB3 0EL, UK |
| Abstract: | The determination of sulphide at an electrochemically generated nickel oxide layer at glassy carbon and screen-printed electrodes in acidic media has been examined and appraised. The NiO layer was found to produce a stripping-like signal to sulphide and gave a linear peak current response from 20 to 90 μM. The response was further enhanced by repetitive cycling allowing accumulation of nickel sulphide at the electrode surface such that lower micromolar levels of sulphide (i.e. 5 μM) can be determined. The response at the NiO layer to sulphide is shown to be reproducible over a period of 24 h, thereby offering the development of a disposable amperometric sensor for sulphide. |
| Keywords: | Nickel deposition Glassy carbon Screen-printed carbon electrode Sulphide |
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