High selective determination iron(II) by its enhancement effect on the fluorescence of pyrene-tetramethylpiperidinyl (TEMPO) as a spin fluorescence probe.
A novel fluorescence method determination for iron(II) with a high selectivity and sensitivity has been proposed, based on the enhancement of fluorescence signals resulting from specific redox reaction between synthesized spin fluorescence probe pyrene-tetramethylpiperidinyl (TEMPO) and iron(II). Under the experimental conditions, fluorescent probe displayed a rapid and linear response for iron(II) over the concentration range from 2.4 x 10(-7) to 3.6 x 10(-6) mol/L. The limit of detection was 4.0 x 10(-8) mol/L. The relative standard deviation of six replicate measurements was 1.90% for 3.0 x 10(-7) mol/L iron(II). Because of the specific redox reaction between developed spin fluorescence probe and iron(II), there are few interference by other ions, especially in the presence of relative high concentration iron(III). The method has been successfully applied for iron(II) determinations in two different kinds of real samples. Results determined by the proposed method agree favorably with those determined UV-vis spectrometry method with 1,10-phenanthroline.
Chen
Jin-Long
JL
College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
Zhuo
Shu-Juan
SJ
Wu
Yu-Qing
YQ
Fang
Fang
F
Li
Ling
L
Zhu
Chang-Qing
CQ
D000143:Acids; D002138:Calibration; D003497:Cyclic N-Oxides / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D007501:Iron / Q000032:analysis* / Q000737:chemistry*; D007700:Kinetics; D013050:Spectrometry, Fluorescence; D013997:Time Factors
D000143:Acids; D003497:Cyclic N-Oxides; D005456:Fluorescent Dyes; D007501:Iron; C003959:TEMPO