| Abstract
| - The activity of NaOH is known to be significantly affectedby the presence of an alcohol in aqueous solutions. Anovel linear relationship between (∂A/∂Calcohol) and Cbasewas found in the highly alkaline, mixed H2O−ROH solutions (R = Me, Et, i-Pr). The use of this linear relationshipled to a dual-transducer approach to decompose theoptical signals of optical base sensors and to give baseand alcohol concentrations in concentrated NaOH−H2O−ROH solutions ([OH-] = 0.05−3.6 M). The scope of thenew dual-sensor approach was evaluated, and errors inCbase and Calcohol were analyzed. The optical base sensorsconsist of sol−gel SiO2−ZrO2−organic polymer composites doped with high-pKa indicators. The pKas of theindicators encapsulated in the composite films weredetermined and found to be affected by the compositionof the sol−gel composites.
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