High-Basicity Determination in Mixed Water−Alcohol Solutions by a Dual Optical Sensor Approach

The activity of NaOH is known to be significantly affected by the presence of an alcohol in aqueous solutions. A novel linear relationship between (∂A/∂C alcohol) and C base was found in the highly alkaline, mixed H2O−ROH solutions (R = Me, Et, i-Pr). The use of this linear relationship led to a dua...

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Published in:Analytical chemistry (Washington) 2002-12, Vol.74 (23), p.6073-6079
Main Authors: Canada, T. Andrew, Xue, Ziling
Format: Article
Language:English
Subjects:
Alcohol
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
Water
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description The activity of NaOH is known to be significantly affected by the presence of an alcohol in aqueous solutions. A novel linear relationship between (∂A/∂C alcohol) and C base was found in the highly alkaline, mixed H2O−ROH solutions (R = Me, Et, i-Pr). The use of this linear relationship led to a dual-transducer approach to decompose the optical signals of optical base sensors and to give base and alcohol concentrations in concentrated NaOH−H2O−ROH solutions ([OH-] = 0.05−3.6 M). The scope of the new dual-sensor approach was evaluated, and errors in C base and C alcohol were analyzed. The optical base sensors consist of sol−gel SiO2−ZrO2−organic polymer composites doped with high-pK a indicators. The pK as of the indicators encapsulated in the composite films were determined and found to be affected by the composition of the sol−gel composites.
doi_str_mv 10.1021/ac0202987
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Alcohol
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
Water
title High-Basicity Determination in Mixed Water−Alcohol Solutions by a Dual Optical Sensor Approach
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