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Simultaneous Determination of 4‐Chlorophenol and Oxalic Acid Using an Expanded Graphite‐Epoxy Composite Electrode
Author(s) -
Manea Florica,
Radovan Ciprian,
Corb Ioana,
Pop Aniela,
Burtica Georgeta,
Malchev Plamen,
Picken Stephen,
Schoonman Joop
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804235
Subject(s) - oxalic acid , differential pulse voltammetry , chronoamperometry , cyclic voltammetry , epoxy , chemistry , graphite , electrode , electrochemistry , nuclear chemistry , analytical chemistry (journal) , voltammetry , chromatography , materials science , inorganic chemistry , organic chemistry
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 Na 2 SO 4 .