Microextraction Preconcentration of Chloroacetic Acids with the Flotation Separation of the Extract

A procedure is developed for liquid–liquid microextraction preconcentration of mono-, di-, and trichloroacetic acids (CAAs) with the flotation separation of the extract. Methyl tert -butyl ether, emulsified by ultrasonic treatment, is used as an extractant. Preconcentration is carried out in a 27-mL...

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2022-05, Vol.77 (5), p.588-594
Main Authors: Krylov, V. A., Mosyagin, P. V., Sirotkin, R. G.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Flotation
Separation
Ultrasonic processing
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Summary:A procedure is developed for liquid–liquid microextraction preconcentration of mono-, di-, and trichloroacetic acids (CAAs) with the flotation separation of the extract. Methyl tert -butyl ether, emulsified by ultrasonic treatment, is used as an extractant. Preconcentration is carried out in a 27-mL ampoule, equipped with a capillary for the selection of microquantities of the extract. The ion-chromatographic determination of CAAs is carried out after replacing the organic matrix extract with water. The advantages of the flotation method of demulsification versus the centrifuge one are shown: coefficients of concentration of chloroacetic acids are 2–2.2 times higher; limits of detection for CAAs are lowered to 5 × 10 –4 –4 × 10 –3 mg/L, and extraction time is reduced by a factor of 3.3.
ISSN:1061-9348
1608-3199
DOI:10.1134/S1061934822050069