流动注射化学发光法研究PAN对鲁米诺-亚铁氰化钾反应的催化性能

1-(2-吡啶偶氮)-2-萘酚(PAN)对鲁米诺-亚铁氰化钾化学发光反应有良好的催化性能,实验结果表明:在1.0×10-5-1.0×10-7mol/L范围内,发光强度与PAN的浓度之间有良好的线性关系,检测极限为5.6×10-8mol/L。同时发现一些金属对此化学发光反应有强的抑制作用,为此建立了用此反应测定这此金属离子的新方法,测定Ni2+,Cr3+,Zn2+,Co2+和Cu2+的检测极限分别为1.0×10-9mol/L、1.0×10-8mol/L、1.0×10-8mol/L、5.0×10-9mol/L和6.0×10-9mol/L,相对标准偏差在1.28-3.10%(n=11)范围内。

Research of the Catalytic Effect of PAN on the Luminol - potassium Ferricyanide Reaction Using a Flow- injection Chemiluminescence Method

We find that 1-(2-pyridylazo)-2-naphthol(PAN) has a strong catalytic effect on luminol–potassium ferricyanide chemiluminescence(CL).The results indicate that the chemiluminescence intensities at maximum light emission are linearly corrected with the concentration of PAN over the range 1.0×10-5–1.0×10-7 mol/L.A detection limit of 5.6×10-8 mol/L for PAN is achieved.It is found that some metal ions strongly affect this catalytic reaction.Based on this finding,the luminol–potassium ferricyanide–PAN reaction is developed for the determination of metal ions.The detection limits for Ni2+,Cr3+,Zn2+,Co2+ and Cu2+ are determined to be 1.0×10-9 mol/L,1.0×10-8 mol/L,1.0×10-8 mol/L,5.0 ×10-9 mol/L and 6.0×10-9 mol/L,respectively.In addition,the relative standard deviation values for these metal ion assays are in the range 1.28–3.10%(n = 11).