Picric acid sensitive optode based on a fluorescence carrier covalently bound to membrane.
An acryloyl group was attached to fluorescein through the phenol hydroxyl group to make it photopolymerizable with 2-hydroxypropyl methacrylate and covalently immobilized on an optode glass surface modified with gamma-(methacryloxy)propyltrimethoxysilane. The optode system with a plastic-clad fused silica bifurcated fiber optic bundle shows satisfactory analytical performance characteristics for determining picric acid in terms of selectivity and reproducibility with a linear range from 8.0 x 10(-7) to 4.0 x 10(-3) mol L-1. The quenching mechanism was investigated. The optode membrane can be applied to the indirect determination of cinchonine drug and the results obtained were satisfactory.
Yang
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Institute for Chemometrics and Chemical Sensing Technology, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Niu
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Shen
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Yu
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D005336:Fiber Optic Technology; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000032:analysis; D055100:Optical Fibers; D010851:Picrates / Q000032:analysis*; D013050:Spectrometry, Fluorescence
D007202:Indicators and Reagents; D010851:Picrates; C005858:picric acid