Study of the catalytic effect of PAR on the luminol-potassium ferricyanide reaction using a flow-injection chemiluminescence method.
We discovered that 4-(2-pyridylazo) resorcinol (PAR) has a strong catalytic effect on luminol-potassium ferricyanide chemiluminescence (CL). Results indicated that the chemiluminescence intensities at maximum light emission were linearly corrected with the concentration of PAR over the range 1.0 x 10(-5)-1.0 x 10(-7) mol/L. A detection limit of 5.7 x 10(-8) mol/L for PAR was achieved. It was found that some metal ions strongly affected this catalytic reaction. Based on this finding, the luminol-potassium ferricyanide-PAR reaction was developed for the determination of metal ions. The detection limits (S/N = 3) for Ni2+, Cr3+, Zn2+, Co2+ and Mn2+ were determined to be 1.0 x 10(-9) mol/L, 5.0 x 10(-9) mol/L, 5.0 x 10(-8) mol/L, 1.0 x 10(-9) mol/L and 1.0 x 10(-8) mol/L, respectively. In addition, the relative standard deviation values for these metal ion assays were in the range 0.82-2.72% (n = 6).
Hu
Yonggang
Y
College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. yongganghu@163.com
Pang
Zhitao
Z
Yang
Zeyu
Z
Wei
Wei
W
Wu
Yuping
Y
D002384:Catalysis; D005292:Ferricyanides / Q000737:chemistry* / Q000378:metabolism; D017022:Flow Injection Analysis / Q000379:methods*; D007700:Kinetics; D008163:Luminescent Measurements / Q000379:methods*; D008165:Luminol / Q000737:chemistry* / Q000378:metabolism; D012118:Resorcinols / Q000737:chemistry* / Q000494:pharmacology*
D005292:Ferricyanides; D012118:Resorcinols; D008165:Luminol; C028398:4-(2-pyridylazo)resorcinol; C028033:potassium ferricyanide