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Citation: LONG Li-Ping, NIE Wei-An, ZHONG Tong-Sheng, LEI Cun-Xi. An Optical Chemical Sensor for Lead Based on Fluorescence Quenching of TMOPP[J]. Chinese Journal of Applied Chemistry, ;2007, 24(7): 806-809. shu

An Optical Chemical Sensor for Lead Based on Fluorescence Quenching of TMOPP

1.
Department of Chemistry & Environmental Engineering, Hunan City College, Yiyang 413049

Corresponding author: LONG Li-Ping,
Received Date: 19 July 2006
Available Online: 23 October 2006
Fund Project: 湖南省教育厅科学研究基金(03C116) (03C116)

An optical chemical sensor was developed for the determination of Lead (Ⅱ) based on the reversible fluorescence quenching of Meso-(4-MethyloxypHenyl) PorpHyrin (TMOPP) immobilized in a plasticized poly (vinyl chloride)(PVC) membrane.The optimum membrane of the sensor is composed of 50 mg of PVC,100 mg of bis (2-ethytbexyl) sebacate (DOS) and 3.0 mg of TMOPP.The maximum response of the optode membrane for Lead (Ⅱ) was obtained in a Tris/HCl buffer solution of pH=9.0.Under the optimum conditions described,the proposed sensor responds linearly in a concentration range of 7.90×10^-6~6.30×10^-4 mol/L,with a detection limit of 2.50×10^-7 mol/L.The response time of the sensor is less than 1 min.The sensing membrane has the advantages of high reproducibility,reversibility of the fluorescence signal and good selectivity.Common anions and cations do not interfere.It was applied to the direct determination of micromount of Lead (Ⅱ) in environmental water with satisfactory result.
- optical chemical sensor,
- fluorescence quenching,
- meso-(methyloxypHenyl) porpHyrin (TMOPP),
- lead (Ⅱ)
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