Abstract
The electrochemical behavior of phenolic isomers hydroquinone (HQ), catechol (CC) and resorcinol (RC) was examined in poly(1,5-diaminonaphthalene)/glassy carbon-modified electrode (P1,5-DAN/GC M.E.) by cyclic voltammetry (CV), square wave voltammetry (SWV) and chronoamperometry (CA) techniques in perchloric acid (HClO4) and phosphate buffer solution (PBS, pH 7.0). P1,5-DAN/GC M.E. was investigated for simultaneous determination of HQ, CC and RC in single, binary and ternary systems. Oxidation peak potentials were negatively shifted with increasing oxidation peak current for HQ, CC and RC at P1,5-DAN/GC M.E. compared with bare GC electrode. The obtained results illustrate that the former electrode exhibits better performance towards the three isomers in PBS rather than in HClO4 solution. The catalytic currents for different concentrations of HQ, CC and RC showed good relationship in the range of 0.1–100 μM for all analytes and low detection limits (LOD) of 0.034, 0.059 and 0.14 μM for them, respectively, in a ternary system in PBS at pH 7.0. This method has been practically applied for the detection of these isomers in tap water with acceptable results.
Highlights
Phenolic compounds broadly occur in the environment
A P1,5-DAN/ GC-modi ed electrode was prepared as mentioned in the Experimental section
P1,5-DAN/GC M.E. was prepared by electropolymerization method
Summary
Hydroquinone (HQ), catechol (CC) and resorcinol (RC) are isomers of phenolic compounds They can be extensively used for many industrial and medicinal purposes.[1] Phenolic compounds are slowly broken down into less harmful compounds in the natural environment causing environmental pollution. They frequently coexist together and interfere in their detection[2] due to their similar structures and behaviors. Electrochemical procedures are desirable and interesting for the simultaneous identi cation due to the rapid response, low cost, high quanti cation and selectivity.[10] the redox response of these phenolic compounds, mainly HQ and CC, o en interfere, making them difficult to be determined by conventional electrodes. We have reported the synthesis of P1,5-DAN/GC M.E. in both aqueous and nonaqueous media.[15,16] In addition, we had been involved in a program dealing with single and simultaneous detection of several analytes at modi ed electrodes prepared by electropolymerization methods.[17,18,19]
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