Fibre-optic sensor for the determination of carboxylic acids based on fluorescence enhancement of lipophilized fluorescein isologues
✍ Scribed by Hui-Hui Zeng; Ke-Min Wang; Xiao-Hai Yang; Ru-Qin Yu
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 521 KB
- Volume
- 287
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A fibre-optic sensor for the determination of carboxyhc acids based on fluorescence enhancement of lipophilized fluorescein isologues dissolved in a plasticized polyfvinyl chloride1 membrane was developed. With the optimum conditions described, carboxylic acids in sample solutions from 1 to 9 M (formic acid), 0.5 to 10 M (acetic acid), 0.1 to 2.7 M (propionic acid) and 1 X 10m4 to 1 X lo-* M (benzoic acid) can be determined. The response times of the sensor to carboxylic acid are less than 1.5 min. In addition to high reproducibility of the fluorescence signal, the sensor exhibits fair selectivity for carboxylic acids.