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Simple and rapid flow-injection spectrophotometric determination of carbaryl after liquid-liquid extraction

✍ Scribed by Karim D. Khalaf; A. Morales-Rubio; M. de la Guardia

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 696 KB
Volume: 280
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)85126-5

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✦ Synopsis

A simple procedure was developed for the spectrophotometric determination of carbaryl and its hydrolysis product I-naphthol in water. These compounds are extracted into xylene and back-extracted, as the 1-naphtholate, with 0.2 M NaOH. A 600-~1 volume of the alkaline extract is injected into a flow analysis manifold which provides the reaction between naphtholate and 50 pg ml-' p-aminophenol solution in the presence of 0.004 M KIO, and spectrophotometric measurement is carried out at 5% nm. The method provides a limit of detection of 26.5 ng ml-' carbaryl and a sample frequency of 110 injections per hour. Recoveries in different types of matrices vary from 95 to 102%.

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