引用本文:
龙立平, 聂伟安, 钟桐生, 雷存喜. 基于卟啉衍生物荧光熄灭的Pb2+光化学传感器[J]. 应用化学,
2007, 24(7): 806-809.
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.
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.
基于卟啉衍生物荧光熄灭的Pb2+光化学传感器
摘要:
Pb2+对固定于聚氯乙烯(PVC)膜中的Meso-5,10,15,20-四(4-甲氧基苯基)卟啉(TMOPP)有可逆荧光猝灭作用,研制成测定Pb2+浓度的光化学传感器。传感器敏感膜最佳组成为:50 mg PVC、100 mg癸二酸二异辛脂(DOS)和3.0 mg TMOPP。在pH=9.0的Tris/HCl缓冲体系中测定Pb2+,其线性响应范围为7.90×10-6~6.30×10-4 mol/L,检出限为2.50×10-7 mol/L,响应时间小于1 min。敏感膜具有良好的重现性、可逆性和选择性,其它常见阴离子和阳离子不干扰测定。用敏感膜制成的光化学传感器来测定环境水样中Pb2+的含量,结果满意。
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关键词:
- 光化学传感器
- / 荧光猝灭
- / Meso-四(甲氧基苯基)卟啉(TMOPP)
- / Pb2+
English
An Optical Chemical Sensor for Lead Based on Fluorescence Quenching of TMOPP
Abstract:
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.
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