Fiber optic pH sensor using acid-base indicators covalently bound on controlled pore glasses

Francesco Baldini; Susanna Bracci; Mauro Bacci

doi:10.1117/12.56534

1 March 1992 Fiber optic pH sensor using acid-base indicators covalently bound on controlled pore glasses

Francesco Baldini, Susanna Bracci, Mauro Bacci

Proceedings Volume 1587, Chemical, Biochemical, and Environmental Fiber Sensors III; (1992) https://doi.org/10.1117/12.56534
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

This paper describes an extensive spectrophotometric study on several acid-base indicators immobilized on controlled pore glass by means of a silylation process. The spectrophotometric properties of the immobilized indicators are at variance with those of the free indicators as far as pH dependence and ranges are concerned. The differing of the spectrophotometric properties of the indicators, when the latter are immobilized on solid supports, can be justified from the point of view of steric hindrance and of the reactivity of the indicators. Particular attention was paid to the pH-sensitive bands and their position. The effect of ionic strength is also investigated. Early tests performed with optical fibers are described.

Citation Download Citation

Francesco Baldini, Susanna Bracci, and Mauro Bacci "Fiber optic pH sensor using acid-base indicators covalently bound on controlled pore glasses", Proc. SPIE 1587, Chemical, Biochemical, and Environmental Fiber Sensors III, (1 March 1992); https://doi.org/10.1117/12.56534

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