title: Simultaneous determination of hydroquinone and catechol at gold nanoparticles mesoporous silica modified carbon paste electrode.
abstract: A new electrochemical sensor based on gold nanoparticles mesoporous silica modified carbon paste electrode (AuNPs-MPS) was developed for simultaneous determination of hydroquinone and catechol. Morphology and structure of the AuNPs-MPS were characterized by transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The electrochemical behavior of hydroquinone and catechol were investigated using square wave voltammetry and the results indicate that the electrochemical responses are improved significantly at the modified electrode. The observed oxidative peaks separation of about 120mV made possible the simultaneous determination of hydroquinone and catechol in their binary-mixture. Under the optimized condition, a linear dynamic range of 10.0μM-1.0mM range for hydroquinone with the detection limit of 1.2μM and from 30.0μM-1.0mM for catechol with the detection limit of 1.1μM were obtained. The applicability of the method was demonstrated by the recovery studies of hydroquinone and catechol in spiked tap water samples.
authors.affiliation: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71456, Iran. Electronic address: tashkhourian@susc.ac.ir.
authors.forename: J
authors.initials: J
authors.lastname: Tashkhourian
authors.affiliation: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71456, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Daneshi
authors.affiliation: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71456, Iran.
authors.forename: F
authors.initials: F
authors.lastname: Nami-Ana
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Evin, Tehran, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Behbahani
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Evin, Tehran, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Bagheri
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002396:Catechols / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006873:Hydroquinones / Q000032:analysis*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D016062:Porosity; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014881:Water Supply; D014961:X-Ray Diffraction
chemical_list: D002396:Catechols; D006873:Hydroquinones; D002244:Carbon; D006046:Gold; D012822:Silicon Dioxide
keywords: Catechol; Dihydroxybenzene isomer; Hydroquinone; Simultaneous determination; Square wave voltammetry