The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination

TALANTA

卷:159

Article

Mehmeti, Eda¹  Stankovic, Dalibor M.²  Hajrizi, Ahmet¹  Kalcher, Kurt¹ 

[1] Karl Franzens Univ Graz, Inst Chem Analyt Chem, Univ Pl 1, A-8010 Graz, Austria

[2] Univ Belgrade, Fac Chem, Innovat Ctr, Dept Analyt Chem, Studentski Trg 12-16, Belgrade 11000, Serbia

关键词: Graphene nanoribbons;    Nitrite;    Amperometry;    Glassy carbon electrode;   

DOI  :  10.1016/j.talanta.2016.05.079

来源: Elsevier

【 摘 要 】

In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9 V (vs. Ag/AgCI, 3.0 M KCI) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105 mu M with the detection limit of 0.22 mu M. Reproducibility of ten replicate measurements of 1 M of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free