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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
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http://hdl.handle.net/123456789/2530
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| Title: | SIMULTANEOUS DETERMINATION OF CATECHOL AND HYDROQUINONE AT POLY-p-(ASA)/MWCNT COMPSITE MODIFIED GLASSY CARBON ELECTRODE |
| Authors: | YAZACHEW, ALEMU |
| Advisors: | SHIMELIS ADMASSIE (Ph.D)
MERID TESSEMA (Ph.D) |
| Keywords: | Catechol and para-amidosalicyclic acid
Hydroquinone
chemically modified electrode
Multiwalled carbon Nanotubes
Electropolymerization
Electrochemistry |
| Copyright: | Jun-2010 |
| Date Added: | 4-May-2012 |
| Publisher: | AAU |
| Abstract: | A simple and highly selective electrochemical method for simultaneous determination of
hydroquinone and catechol has been developed at a glassy carbon electrode modified with
multiwalled carbon nanotubes (MWCNT) and poly-para-amidosalicyclic acid (poly-p-ASA). It
was found that the oxidation peak potential separation and the oxidation currents of
hydroquinone and catechol highly increase at the polymer and MWCNT modified glassy carbon
electrode in 0.10 M phosphate buffer solution (pH 7.0). The oxidation peak potential of
hydroquinone and catechol merge into a large peak at 430.71 mV at bare glassy carbon
electrode. The two well-defined oxidation peaks of hydroquinone in the presence of catechol at
poly-p-(ASA), MWCNT and composite modified electrode occur at 136.52 mV and 228.04 mV,
161.29 mV and 262.82 mV and 172.12 mV and 286.85 mV respectively. Under the optimized
condition, the oxidation peak current of hydroquinone is linear over a range from 2.0×10-5 M to
7.0×10-4 M hydroquinone in the presence of 1.0×10-3 M catechol with the detection limit of
1.2×10-6 M and the oxidation peak current of catechol is linear over a range from 2.0×10-5 M to
6.0×10-4 M catechol in the presence of 1.0×10-3 M hydroquinone with the detection limit of 1.4
×10-7 M. The proposed method has been applied to the simultaneous determination of
hydroquinone and catechol in a water sample and the results are satisfactory. |
| URI: | http://hdl.handle.net/123456789/2530 |
| Appears in: | Thesis - Chemistry
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