Simultaneous determination of hydroquinone and catechol at PASA/MWNTs composite film modified glassy carbon electrode.
A poly-amidosulfonic acid and multi-wall carbon nanotubes composite (PASA/MWNTs) modified electrode has been constructed by electropolymerization on glassy carbon electrode (GCE). The electrochemical behaviors of hydroquinone (HQ) and catechol (CC) were investigated using cyclic and differential pulse voltammetries (DPVs) at the prepared electrode. Separation of the reductive peak potentials for HQ and CC was about 120 mV in pH 6.0 phosphate buffer solution (PBS), which makes it suitable for simultaneous determination of these compounds. In the presence of 1.0 x 10(-4)mol L(-1) isomer, the reductive peak currents of DPV are proportional to the concentration of HQ in the range of 6.0 x 10(-6) to 4.0 x 10(-4)mol L(-1), and to that of CC in the range of 6.0 x 10(-6) to 7.0 x 10(-4)mol L(-1). When simultaneously changing the concentration of both HQ and CC, the linear concentration range of HQ (or CC) is 6.0 x 10(-6) to 1.0 x 10(-4)mol L(-1) (or 6.0 x 10(-6) to 1.8 x 10(-4)mol L(-1)), and the corresponding detection limits are 1.0 x 10(-6)mol L(-1). The proposed method has been applied to simultaneous determination of HQ and catechol in water sample, and the results are satisfactory.
Zhao
Dong-Ming
DM
Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, PR China.
Zhang
Xiu-Hua
XH
Feng
Li-Jun
LJ
Jia
Li
L
Wang
Sheng-Fu
SF
D002244:Carbon / Q000737:chemistry*; D002396:Catechols / Q000032:analysis*; D017097:Electric Impedance; D055664:Electrochemical Techniques; D004566:Electrodes; D005898:Glass / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006873:Hydroquinones / Q000032:analysis*; D053761:Nanocomposites / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000032:analysis*; D013451:Sulfonic Acids / Q000032:analysis*; D014867:Water / Q000737:chemistry
D002396:Catechols; D006873:Hydroquinones; D037742:Nanotubes, Carbon; D013451:Sulfonic Acids; C531175:poly(amidosulfonic acid); D014867:Water; D002244:Carbon; C034221:catechol; C031927:hydroquinone