Chemiluminescence behaviour of CdTe-potassium permanganate enhanced by sodium hexametaphosphate and sensitized sensing of L-ascorbic acid.
A highly sensitive flow-injection chemiluminescence (FIA-CL) method based on the CdTe nanocrystals and potassium permanganate chemiluminescence system was developed for the determination of L-ascorbic acid. It was found that sodium hexametaphosphate (SP), as an enhancer, could increase the chemiluminescence (CL) emission from the redox reaction of CdTe quantum dots with potassium permanganate in near-neutral pH conditions. L-ascorbic acid is suggested as a sensitive enhancer for use in the above energy-transfer excitation process. Under optimal conditions, the calibration graph of emission intensity against logarithmic l-ascorbic acid concentration was linear in the range 1.0 × 10(-9)-5.0 × 10(-6)  mol/L, with a correlation coefficient of 0.9969 and relative standard deviation (RSD) of 2.3% (n = 7) at 5.0 × 10(-7)  mol/L. The method was successfully used to determine L-ascorbic acid in vitamin C tablets. The possible mechanism of the chemiluminescence in the system is also discussed.
Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China.
Hongqi
H
Chen
Bo
B
Ling
Fei
F
Yuan
Cailing
C
Zhou
Jingguo
J
Chen
Lun
L
Wang
D001205:Ascorbic Acid / Q000032:analysis*; D019187:Cadmium Compounds / Q000737:chemistry*; D002138:Calibration; D005978:Glutathione / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D011196:Potassium Permanganate / Q000737:chemistry*; D045663:Quantum Dots; D013607:Tablets / Q000032:analysis; D013691:Tellurium / Q000737:chemistry*; D013853:Thioacetamide / Q000737:chemistry; D014675:Vegetables / Q000737:chemistry
D019187:Cadmium Compounds; D010710:Phosphates; D013607:Tablets; D011196:Potassium Permanganate; D013853:Thioacetamide; D005978:Glutathione; D013691:Tellurium; C009285:sodium polymetaphosphate; D001205:Ascorbic Acid; C028337:cadmium telluride