Determination of the acetic acid in intermediate fractions of ethanol production by modified piezosensor
Abstract
In this article, piezoelectric sensors based on molecularly imprinted polymers (MIP) for determining the acetic acid in liquids have developed. Using polyamic acid (PAA), which is the copolymer of 1,2,4,5- benzenetetracarboxylic acid and 4,4′-diaminodiphenyl ether, the non-imprinted polymer (NIP) and molecularly imprinted polymer for acetic acid (MIP-Acetic) were synthesized on the surface of piezoelectric sensors. The values of the imprinting factor and the selectivity coefficients of the obtained MIP when determining different carboxylic acids were compared. It was found that the sensor modified by the molecularly imprinted polymer was highly selective to the acetic acid that was the template during the synthesis. The limit of detection of the acetic acid was 1.10–6 mol/dm3.
In the model binary and ternary mixtures of carboxylic acids the sensor with the molecular imprints is the most sensitive to the temple-acetic acid. The relative standard deviation does not exceed 10%. The results of the determination of the acetic acid by piezoelectric sensors with the standard technique (chromatography-mass spectrometry Agilent Technological 7890B GC Systems) were compared. It was shown that the
piezosensor method for determining the carboxylic acid does not have systematic errors.
The modified piezoelectric sensors were approved for the analysis of intermediate fractions of ethanol production (distillate of fermentation mixture, epyurat, bottom liquids of columns). The correctness ofdetermination of the acetic acid in liquids was evaluated by using the chromatography-mass spectrometry.
The difference in determination results by piezoelectric sensors and chromatography-mass spectrometry does
not exceed 6%.
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DOI: 10.1134/S1061934806010047.
