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Enhanced Sensitivity of 4‐Chlorophenol Detection by Use of Nitrobenzene as a Liquid Membrane over a Carbon Nanotube‐Modified Glassy Carbon Electrode
Author(s) -
Phanthong Chatuporn,
Somasundrum Mithran
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704111
Subject(s) - nitrobenzene , differential pulse voltammetry , carbon nanotube , detection limit , electrode , glassy carbon , materials science , cyclic voltammetry , voltammetry , analytical chemistry (journal) , linear range , phenol , electrochemistry , carbon fibers , chemistry , nanotechnology , organic chemistry , chromatography , composite number , composite material , catalysis
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.