Amperometry of thiols in a flow-injection system with a nickel oxide electrode |
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Authors: | Yoshiko Arikawa Calvin O Huber |
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Institution: | Department of Chemistry, University of Wisconsin-Wilwaukee, Milwaykee, WI 53201 U.S.A. |
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Abstract: | The electrochemical oxidation of a series of thils on the surface of a nickel oxide electrode is investigated in a flow-injection system. The background electrolyte is 0.1 M NaOH containing 5 × 10?65 M NiSO4 and the injected sample volume is 25 μl. The net peak current is observed at +0.46 V vs. SCE for thiols dissolved in pH 3.0 phthalate buffer. The upper limit of linearity extends to 10?3 M. The relative standard deviation for ten replicate measurements on 10?4 M ethanethiol is 1.6%. The lower limits of detection are between 3 × 10?5 and 2 × 10?4 M for a series of thiols. Peak shapes indicate that thiolate oxidation mediated by a higher oxide layer on the electrode rather than mass transport or adsorption / rearrangement is the rate-determining step. |
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