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Citation: LONG Li-Ping, WANG Ke-Min, YANG Rong-Hua, YANG Xiao-Hai. An Optical Chemical Sensor for Molybdate Based on Fluorescence Quenching of TOE[J]. Chinese Journal of Applied Chemistry, ;2002, 19(11): 1021-1026. shu

An Optical Chemical Sensor for Molybdate Based on Fluorescence Quenching of TOE

1.
a Department of Chemistry, Hu'nan City College, Yiyang 413049;
2.
b College of Chemistry & Chemical Engineering, Hu'nan University, Changsha

Corresponding author: LONG Li-Ping,
Received Date: 16 May 2002
Available Online: 5 August 2002
Fund Project: 国家杰出青年基金(29825110) (29825110)教育部重大课题(2000-156)资助项目 (2000-156)

An optical chemical sensor for molybdate based on reversible fluorescence quenching property of 2,2,7,7,12,12,17,17-octamethyl-21,22,23,24-tetraoxaquaterene(TOE) immobilized in poly(vinyl chloride)(PVC) membrane has been developed. The optimum membrane sensor consists of 2.6 mg TOE, 50 mg PVC and 100 mg diisooctyl sebacate(DOS). The maximum response of the membrane sensor for molybdate was obtained in Tris/HCl buffer solution (pH=8.0). The sensor responds linearly in range of 1.43×10^-7 to 5.0×10^-4 mol/L molybdate, with detection limit of 4.73×10^-8 mol/L, response time less than 30 s. In addition to high reproducibility and reversibility, the sensor also exhibits good selectivity over some common anions and cations. It has been applied in the determination of molybdenum as molybdate in a Scheelite sample, with satisfactory results.
- optical chemical sensor,
- octamethyl-tetraoxaquaterene,
- molybdate anion,
- fluorescence quenching,
- scheelite
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