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- Title
A Simple and Highly Sensitive Electrochemically Reduced p-Nitrobenzoic Acid Film Modified Sensor for Determination of Mercury.
- Authors
Arulraj, A. Daniel; Vijayan, M.; Samseya, J.; Vasantha, V. S.
- Abstract
Herein, a simple electrochemical sensor was fabricated for sensing Hg2+ ions by using electrochemically reduced p-nitrobenzoic acid molecules modified (ERpNBA) glassy carbon electrode (GCE). The modified electrode was applied for the determination of Hg2+ ions by using differential pulse anodic stripping voltammetry (DPASV). Experimental parameters such as concentration of p-nitrobenzoic acid used for electrode modification, pH, accumulation time and deposition potential used for the determination of Hg2+ ions were optimized. The strong interaction between the Hg2+ ions and the lone pair of electrons on the nitrogen atoms of ERpNBA molecules leads to highly selective adsorption of Hg2+ ions on the modified electrode. Under the optimum experimental conditions, the sensor showed higher sensitivity and very low detection limit for Hg2+ ions than other metal ions such as Cd2+, Pb2+ and Zn2+ ions. The LOD for Hg2+ ions was 240 pM which is below the guideline value given by the World Health Organization and the earlier reports.
- Subjects
MERCURY; NITROBENZOIC acid; ELECTROCHEMICAL sensors; IMPEDANCE spectroscopy; DIFFERENTIAL pulse code modulation; STRIPPING reaction (Nuclear physics)
- Publication
Electroanalysis, 2014, Vol 26, Issue 12, p2773
- ISSN
1040-0397
- Publication type
Article
- DOI
10.1002/elan.201400460