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Citation: LONG Li-Ping, WANG Ke-Min, YANG Rong-Hua, ZHONG Tong-Sheng. An Iron(Ⅲ) Sensing Membrane Based on Fluorescence Quenching[J]. Chinese Journal of Applied Chemistry, ;2003, 20(4): 341-345. shu

An Iron(Ⅲ) Sensing Membrane Based on Fluorescence Quenching

1.
a Department of Chemistry & Environmental Engineering, Hunan City College, Yiyang 413049;
2.
b College of Chemistry & Chemical Engineering, Hunan University, Changsha

Corresponding author: LONG Li-Ping,
Received Date: 29 August 2002
Available Online: 29 November 2002
Fund Project: 国家杰出青年基金(29825110) (29825110)教育部重大课题(2000-156)项目资助 (2000-156)

An optical chemical sensor has been developed for the determination of iron (Ⅲ) based on reversible fluorescence quenching of N,N'-dibenzyl-3,3',5,5'-tetramethylbenzidine (TMBD) immobilized in a plasticized poly (vinyl chloride)(PVC) membrane.The sensing membrane consisted of 50 mg PVC,100 mg dioctyl sebacate (DOS) and 3.0 mg TMBD.The maximum response of the optode membrane for Iron (Ⅲ) was obtained in HAc-NaAc buffer solution.At optimum conditions the relationship between sensor responce and the concentration of Fe³⁺ ions was linear from 3.98×10^-6 to 1.00×10^-3 mol/L,with detection limit of 1.00×10^-7 mol/L.The response time was less than 1 min.The sensing membrane has the advantage of high reproducibility,reversibility of the fluorescence signals and good selectivity.Common anions and cations do not interfere the measurements.It was applied for the direct determination of Fe³⁺ in human hair,green gram and milk powder samples.The results were in good agreement with those obattained by AAS method.
- optical chemical sensor,
- fluorescence quenching,
- dibenzylaniline-tetramethylbenzidine,
- iron (Ⅲ)
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