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Rapid microwave assisted hydrolysis of formetanate

✍ Scribed by K. Dema-Khalaf; A. Morales-Rubio; M. de la Guardia

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 720 KB
Volume: 281
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)85179-n

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✦ Synopsis

A fast microwave-assisted hydrolysis procedure has been developed for the derivatization of formetanate previously to the flow-injection spectrophotometric determination of m-aminophenol by reaction with p-aminophenol. Formetanate is quantitatively hydrolyzed with 0.1 M NaOH in 150 s using a closed polytetrafluoroethylene reactor with 115 ml internal volume and a radiation power of 390 W. The above procedure has been applied, as a previous step, for the flow-injection spectrophotometric determination of formetanate in spiked water samples and accurate and precise results have been found. The method permits to obtain a limit of detection of 0.025 mg I-' of formetanate. The relative standard deviation of five independent analyses of a sample containing 6 mg I-' formetanate was 0.5%.

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