Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 168, Issue -, Pages 381-389Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.04.041
Keywords
p-Nitrophenol; Salicylaldehyde-modified chitosan; Acetylene black paste electrode; Voltammetric determination
Funding
- National Natural Science Foundation of China [21105024]
- Science and Technology Department of Hunan Province [2011FJ3165]
- Education Department of Hunan Province [11CY002]
- Research Award Fund for Outstanding Young Teachers of Hunan Province [2011]
- Science and Technology Bureau of Hengyang City [2010KJ21]
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A novel method has been developed for the determination of p-nitrophenol (p-NP), which was based on the enhanced electrochemical response of p-NP at an acetylene black paste electrode coated with salicylaldehyde-modified chitosan (denoted as S-CHIT/ABPE). In 0.2 mol L-1 HCl solution, p-NP yielded a sensitive reduction peak at -0.348 V. Compared with the poor response at conventional carbon paste electrode, S-CHIT/ABPE remarkably increased the peak current of p-NP. All the experimental conditions, which influence the electrochemical response of p-NP, were studied and the optimum conditions were achieved. Finally, a sensitive and simple voltammetric method with a good linear relationship in the range of 8.0 x 10(-8) mol L-1 to 2.0 x 10(-6) mol L-1 was developed for the determination of p-NP. The detection limit (S/N = 3) was also examined and a low value of 3.0 x 10(-8) mol L-1 for 120 s accumulation was obtained. The method has been successfully applied to the determination of p-NP in water samples with good recovery in the range of 96-104%. (C) 2012 Elsevier B.V. All rights reserved.
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