Fibre-optic reflectometric study on acid—base equilibria of immobilized indicators: effect of the nature of immobilizing agents

✍ Scribed by Roberto T. Andres; Fortunato Sevilla III

• Book ID: 102623670
• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 292 KB
• Volume: 251
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(91)87130-y

✦ Synopsis

The equilibrium properties of three acid-base indicators immobilized on a non-ionic polymer and on an ion-exchange resin were investigated using fibre-optic reflectometry. Kubetia-Munk functions derived from the reflectance data were used to determine the acidity constants.

The results indicate that the ionization of indicators immobilized on a non-polar surface was less extensive than when it was immobilized on an ionic solid resin. The "solvent" model for adsorption on a polymer surface was supported by these observations.