Enhanced Sensitivity of 4-Chlorophenol Detection by Use of Nitrobenzene as a Liquid Membrane over a Carbon Nanotube-Modified Glassy Carbon Electrode
✍ Scribed by Chatuporn Phanthong; Mithran Somasundrum
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 149 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
The analytical utility of nitrobenzene as a liquid membrane for the detection of hydrophobic compounds was examined with a glassy carbon electrode, using 4‐chlorophenol as the model analyte. Electrochemical experiments indicated a large partition coefficient for the entry of 4‐chlorophenol into the nitrobenzene (7.6×10^2^±1.5×10^2^). This was combined with an increase in effective electrode area by coating with single‐walled nanotubes. Differential pulse voltammetry produced a linear response across the range 0.3 nM to 1.5 nM with a sensitivity of 1.1×10^−5^ A nM^−1^ cm^−2^. To the best of our knowledge, this limit of detection for phenol is lower than other nonenzymatic modifications of carbon.