CdTe nanocrystals-enhanced chemiluminescence from peroxynitrous acid-carbonate and its application to the direct determination of nitrite.
It was found that CdTe semiconductor nanocrystals (NCs) can induce a great sensitized effect on chemiluminescence (CL) emission from peroxynitrous acid (ONOOH)-Na(2)CO(3) system. CL spectra, fluorescence (FL) spectra, and the quenching effect of reactive oxygen species were used to investigate the CL reaction mechanism. The CL intensity was proportional to the concentration of nitrite in the range from 0.05 to 50μM. The detection limit (S/N=3) was 0.024μM and the relative standard deviation (RSD) for five repeated measurements of 0.5μM nitrite was 4.2%. This method has been successfully applied to determine nitrite in well water samples with recoveries of 94.0-100.5%. This was the first work for direct (not inhibition effect) determination of analytes using semiconductor NCs-based CL sensor.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Hongxia
H
Zhang
Lijuan
L
Zhang
Chao
C
Lu
Lixia
L
Zhao
Zhixia
Z
Zheng
D019187:Cadmium Compounds / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry; D060766:Drinking Water / Q000032:analysis*; D004867:Equipment Design; D008163:Luminescent Measurements / Q000295:instrumentation* / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009573:Nitrites / Q000032:analysis*; D030421:Peroxynitrous Acid / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013691:Tellurium / Q000737:chemistry*
D019187:Cadmium Compounds; D002254:Carbonates; D060766:Drinking Water; D009573:Nitrites; D030421:Peroxynitrous Acid; D013691:Tellurium; C028337:cadmium telluride