Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 421, Issue -, Pages 78-84Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.01.030
Keywords
Cobalt porphyrin; Self-assembly; AuNPs decorated glassy carbon electrode; Nitrite ion
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Funding
- University Grants Commission (UGC), New Delhi
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The present study reports the electrochemical determination of nitrite ion using citrate-gold nanopartides (cit-AuNPs) decorated on meso-tetra(para-aminophenyl)porphyrinatocobalt(II) (Co(II)MTpAP) self-assembled glassy carbon electrode (GCE). The decoration of cit-AuNPs on Co(II)MTpAP was achieved with the aid of amine groups present on the surface of the self-assembled monolayer (SAM) of Co(II)MTpAP. The SEM image shows that the cit-AuNPs were densely packed on Co(II)MTpAP. The AuNPs decorated electrode was successfully used for the determination of nitrite ion. The cit-AuNPs decorated electrode not only shifted nitrite ion oxidation potential towards less positive potential but also greatly enhanced its current when compared to bare and Co(II)MTpAP SAM modified electrodes. The ampero-metric current increases linearly while increasing the concentration of nitrite ion ranging from 0.5 x 10(-6) to 4.7 x 10(-6) M and the detection limit was found to be 60 nM (S/N=3). Further, the modified electrode was successfully used to determine nitrite ion in the presence of 200-fold excess of common interferents such as Na,(+) NO3-, I-, K+, CO32-, Ca2+, SO42-, NH4+, Cl- and glucose. The practical application of the cit-AuNPs decorated electrode was demonstrated by determining nitrite ion in water samples. (C) 2014 Elsevier Inc. All rights reserved.
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