Electrochemical determination of nitrite using a gold nanoparticles-modified glassy carbon electrode prepared by the seed-mediated growth technique.
Seed-mediated growth of gold nanoparticles on glassy carbon (GC) surfaces was developed. The field emission scanning electron microscopy (FE-SEM) and electrochemical characterization confirmed the effective attachment of gold nanoparticles on GC surface with such a wet-chemical method. The as-prepared gold nanoparticles attached glassy carbon electrode (Au/GCE) presented excellent catalytic ability toward the oxidation of nitrite. Compared with bare GCE and planar gold electrode, the Au/GCE obviously decreased the overpotential of nitrite oxidation and improved the peak current. The catalytic current was found to be linearly proportional to the nitrite concentration in the range of 1 x 10(-5) - 5 x 10(-3) M, with a detection limit of 2.4 x 10(-6) M. The Au/GCE was successfully applied to the electrochemical determination of nitrite in a real wastewater sample, showing excellent stability and anti-interference ability.
Cui
Yanping
Y
College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
Yang
Changzhu
C
Zeng
Wei
W
Oyama
Munetaka
M
Pu
Wenhong
W
Zhang
Jingdong
J
D002138:Calibration; D002244:Carbon; D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008839:Microelectrodes; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D009573:Nitrites / Q000032:analysis*; D010084:Oxidation-Reduction; D012722:Sewage / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet
D002593:Cetrimonium Compounds; D007202:Indicators and Reagents; D009573:Nitrites; D012722:Sewage; D002244:Carbon; D006046:Gold; D000077286:Cetrimonium