Journal
ELECTROANALYSIS
Volume 21, Issue 13, Pages 1521-1526Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200804573
Keywords
Dihydroxybenzene isomers; Layered double hydroxides; Electrodeposition; Simultaneous determination; Film modified electrode; Thin films; Sensors
Categories
Funding
- Natural Science Foundation of China [20801001, 20875001]
- Science Foundation of Education Committee of Anhui Province [KJ2007B098]
- Foundation for Doctor Science Research of Anhui Normal University
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A stable dihydroxybenzene sensor was fabricated by electrochemical deposition of Zn/Al layered double hydroxide film on glassy carbon electrode (LDHf/GCE). The sensitive and facile electrochemical method for the simultaneous determination of catechol (CA) and hydroquinone (HQ) under coexistence of resorcinol (RE) has been achieved at the LDHf/GCE in phosphate buffer solution (pH 6.5). Under the optimized conditions, the differential pulse voltammetry response of the modified electrode to CA (or HQ) shows a linear concentration range of 0.6 mu M to 6.0 mM (or 3.2 mu M to 2.4 mM) with a correlation coefficient of 0.9987 (or 0.9992) and the calculated limit of detection is 0.1 mu M (or 1.0 mu M) at a signal-to-noise ratio of 3. In the presence of 50 mu M isomer, the linear concentration ranges for CA and HQ are 3.0 mu M to 1.5 mM and 12.0 mu M to 0.8 mM, respectively. The detection limits are 1.2 mu M and 9.0 mu M. Further, the proposed method has been performed to successfully detect dihydroxybenzene isomers in analysis of real samples, such as water and tea.
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