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Simultaneous Determination of Dihydroxybenzene Isomers at MWCNTs/β‐Cyclodextrin Modified Carbon Ionic Liquid Electrode in the Presence of Cetylpyridinium Bromide
Author(s) -
Yu Qiong,
Liu Yong,
Liu Xiaoying,
Zeng Xiandong,
Luo Shenglian,
Wei Wanzhi
Publication year - 2010
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.200900482
Subject(s) - hydroquinone , resorcinol , chemistry , catechol , bromide , cetylpyridinium chloride , ionic liquid , inorganic chemistry , detection limit , carbon nanotube , pulmonary surfactant , nuclear chemistry , organic chemistry , chromatography , catalysis , materials science , biochemistry , composite material
Simultaneous determination of dihydroxybenzene isomers was investigated at a multi‐wall carbon nanotubes (MWCNTs)/ β ‐cyclodextrin composite modified carbon ionic liquid electrode in phosphate buffer solution (pH 7.0, 1/15 mol/L) in the presence of cationic surfactant cetylpyridinium bromide (CPB). With the great enhancement of surfactant CPB, the voltammetric responses of dihydroxybenzene isomers were more sensitive and selective. The oxidation peak potential of hydroquinone was about 0.024 V, catechol was about 0.140 V and resorcinol 0.520 V in differential pulse voltammetric (DPV) measurements, which indicated that the dihydroxybenzene isomers could be separated entirely. The electrode showed wide linear behaviors in the range of 1.2×10 −7 –2.2×10 −3 , 7.0×10 −7 –1.0×10 −3 , 2.6×10 −6 –9.0×10 −4 mol/L for hydroquinone, catechol and resorcinol, respectively. And the detection limits of the three dihydroxybenzene isomers were 4.0×10 −8 , 8.0×10 −8 , 9.0×10 −7 mol/L, respectively. The proposed method could be applied to the determination of dihydroxybenzene isomers in artificial wastewater, and the recovery was from 97.4% to 104.2%.