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.
Institute for Chemometrics and Chemical Sensing Technology, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
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Niu
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Shen
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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