Functionalization of platinum nanoparticles for electrochemical detection of nitrite

• Published in: Analytical and bioanalytical chemistry 2011-03, Vol.399 (7), p.2407-2411
• Main Authors: Miao, Peng, Shen, Min, Ning, Limin, Chen, Guifang, Yin, Yongmei
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Aniline; Biochemistry; Characterization and Evaluation of Materials; Chemical properties; Chemically modified electrode; Chemistry; Chemistry and Materials Science; Drinking water; Electric properties; Electrochemical methods; Electrochemical Techniques - instrumentation; Electrochemistry; Electrodes; Equipment Design; Exact sciences and technology; Food Science; Gold - chemistry; Griess reaction; Laboratory Medicine; Lakes; Limit of Detection; Mathematical analysis; Monitoring; Monitoring/Environmental Analysis; Nanoparticles; Nanoparticles - chemistry; Nitrites; Nitrites - analysis; Nitrites - chemistry; Platinum; Platinum - chemistry; Platinum nanoparticles; Spectrometric and optical methods; Technical Note; Water Pollutants - analysis
• ISSN: 1618-2642; 1618-2650
• DOI: 10.1007/s00216-010-4642-3

In this work, a novel electrochemical method for nitrite detection by using functionalized platinum nanoparticles (PtNPs) is proposed. Firstly, a gold electrode is immobilized with 4-(2-aminoethyl)benzenamine. Then, PtNPs are modified with 5-[1, 2]dithiolan-3-yl-pentanoic acid [2-(naphthalene-1-ylamino)-ethyl]amide (DPAN). Consequently, in the presence of nitrite ions, Griess reaction occurs between 4-(2-aminoethyl)benzenamine on the electrode and DPAN on PtNPs, thus PtNPs are localized onto the electrode surface. So, PtNPs-electrocatalyzed reduction of H₂O₂ can be achieved to correlate the electrochemical signal with the concentration of nitrite ions. The linear concentration range can be as wide as 10-1,000 μM, while the detection limit is as low as 5 μM. The proposed method has been also successfully applied to the detection of nitrite with the local lake water, and the result is well consistent with that obtained by UV-visible spectrophotometric method. So, this method has potential use for monitoring nitrite in drinking water supplies in the future.