Publication: Simple flow injection for determination of sulfite by amperometric detection using glassy carbon electrode modified with carbon nanotubes-PDDA-gold nanoparticles
Issued Date
2015-01-01
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ISSN
00399140
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2-s2.0-84913589078
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Mahidol University
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SCOPUS
Bibliographic Citation
Talanta. Vol.133, (2015), 134-141
Suggested Citation
Maliwan Amatatongchai, Wongduan Sroysee, Sanoe Chairam, Duangjai Nacapricha Simple flow injection for determination of sulfite by amperometric detection using glassy carbon electrode modified with carbon nanotubes-PDDA-gold nanoparticles. Talanta. Vol.133, (2015), 134-141. doi:10.1016/j.talanta.2014.07.055 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/35782
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Title
Simple flow injection for determination of sulfite by amperometric detection using glassy carbon electrode modified with carbon nanotubes-PDDA-gold nanoparticles
Abstract
© 2014 Elsevier B.V. All rights reserved. A new approach is presented for sensitive and selective measurement of sulfite (SO32-) in beverages based on a simple flow injection system with amperometric detection. In this work, the sulfite sensor was a glassy carbon electrode modified with multiwall carbon nanotubes-poly(diallyldimethylammonium chloride)-gold nanoparticles composites (CNTs-PDDA-AuNPs/GC). Electrochemical oxidation of sulfite with this electrode was first studied in 0.1 M phosphate buffer (pH 7.0) using cyclic voltammetry. The results indicated that the CNTs-PDDA-AuNPs/GC electrode possesses electrocatalytic activity for the oxidation of sulfite with high sensitivity and selectivity. Sulfite was quantified using amperometric measurement with the new sensor at +0.4 V vs Ag/AgCl in conjunction with flow injection. The linear working range for the quantitation of sulfite was 2-200 mg L-1(r2=0.998) with a detection limit of 0.03 mg L-1(3σ of blank) and an estimated precision of 1.5%.The proposed method was successfully applied to the determination of sulfite in fruit juices and wines with a sample throughput of 23 samples per hour.