Simultaneous Determination of 4‐Chlorophenol and Oxalic Acid Using an Expanded Graphite‐Epoxy Composite Electrode |
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| Authors: | Florica Manea Ciprian Radovan Ioana Corb Aniela Pop Georgeta Burtica Plamen Malchev Stephen Picken Joop Schoonman |
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| Affiliation: | 1. ‘Politehnica' University of Timisoara, P‐ta Victoriei no. 2, 300006?Timisoara, Romania;2. West University of Timisoara, Laboratory of Electrochemistry, Str. Pestalozzi no.16, 300115 Timisoara, Romania;3. Delft University of Technology, 2600 GA Delft, The Netherlands |
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| Abstract: | An expanded graphite‐epoxy composite electrode (EG‐Epoxy) was employed for the simultaneous determination of 4‐chlorophenol (4‐CP) and oxalic acid (OA) by using cyclic voltammetry (CV), chronoamperometry (CA), and differential pulse voltammetry (DPV). The results indicated that OA could be determined in the presence of the same concentrations of 4‐CP within the concentration range of 0.1 mM to 0.5 mM with a relative standard deviation (RSD) smaller than 5%. Electrode fouling occurred during CA for 4‐CP concentrations larger than 0.5 mM. The DPV method was used for the simultaneous determination of 4‐CP and OA before and after electrochemical oxidation by chronopotentiometry under galvanostatic conditions (j=0.04 mA cm?2, t=2 h) of a tap water sample spiked with 0.19 mM 4‐CP and 0.1 M Na2SO4. |
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| Keywords: | Simultaneous electrochemical determination 4‐Chlorophenol Oxalic acid Wastewater Expanded graphite‐epoxy composite electrode |
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