Determination of the content of carboxylic acids in industrial solutions by piezoelectric sensors based on polymers with molecular imprints
Abstract
The study is dedicated to the development of piezoelectric sensors based on molecularly imprinted
polymers used to determine carboxylic acids in the gas phase. The aim of the work is to develop a piezoelectric method of identifying carboxylic acids in an air-vapour mixture above an ethanol solution.
Piezoelectric sensors were modified by molecularly imprinted polymers produced from aromatic copolymer 1,2,4,5-benzene tetracarbonic acids with 4,4′-diaminodiphenyloxide. As a result, the following sensors with selected coatings were produced: MIPs–Acetic, MIPs–Propionic, MIPs-Butyric. All sensors were
characterised by low values of standard deviation (within 6%). At the same time, the detection limit of carboxylic acids was 1 10-7 mmol/dm3, and the range of determined concentrations was 1 10-1-1.10-6 mmol/dm3. The obtained graduation graphs are linear and the coefficients of determination is over 98% for all the developed MIP-sensors.
It was established that the modified sensors only react selectively to the carboxylic acids that were
used as templates during synthesis. It made it possible to test these sensors to analyse intermediate ethanol fractions: distillate, epurate, still liquor, and fusel alcohol. It was shown that still liquor has a small amount of all of the three carboxylic acids. The distillate and fusel alcohol contain butyric acid, and the largest impurity content of carboxylic acids is present in the intermediate fraction of epurate.
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References
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