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Kaluza, Dawid
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article
Carbon microsphere - polystyrene composite electrode for three-phase boundary oil analysis
Abstract
<p>Oil analysis for the case of quinizarin in methyllaurate is demonstrated with a disposable carbon microsphere - polystyrene composite electrode. Oxidation and reduction of quinizarin are observed as three-phase boundary processes at the immiscible oil | water | carbon interface. Randomly packed glassy carbon microspheres (2-12μm diameter) held together with a polystyrene binder (ca. 0.1% by weight) are immobilized onto a pencil lead electrode and used for electrochemical oil analysis. Pore-filling with oil is optimised for voltammetric detection and fluorescence spectroscopy is employed to support the mechanistic analysis based on voltammetry. Future applications for a wider range of oils and additives are proposed.</p>