Flow-injection spectrophometric determination of propoxur with p-aminophenol

✍ Scribed by Karim D. Khalaf; J. Sancenón; M. de la Guardia

• Book ID: 102980748
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 615 KB
• Volume: 266
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85286-f

✦ Synopsis

The spectrophotometrx determmatlon of propoxur [2_(1-methylethoxylphenyl methyl carbamatel was camed out with p-ammophenol (PAP) m a flow system The method mvolves the on-lme hydrolysis wnth NaOH of propoxur to 2-lsopropoxyphenol and the oxtdatlon of PAP to its reaae qumone nnme with KIO., and the reactloo between the phenolate and the qumone mune A four-channel flow mamfold was employed to carry out all the merent steps of the reamon comudered, momtormg the mdo dye formed at 600 nm The developed procedure prowdes a typical cahbration hne of A = -0 000, + 18 x 103C (A = absorbance, C = concentration m M) wth a regressIon coefficient of 0 9998 and a lmut of detetion, for a probabtity level of 95% (for K = 3) of 0 1 p.g ml-' In the analysts of synthetic samples contammg propoxur and 2-lsopropoxyphenol, the total concentration of propoxur was determmed with a recovery from 94% to 98.3% The method prowdes results comparable to those obtamed by the batch analysis of natural water samples spllred mth propoxur K@words Flow mJe&on, UV-Vulble spectrophotometry, Pestlades, Propoxur, Waters