Determination of carbofuran in pesticide formulations by flow injection spectrophotometry

✍ Scribed by Renato Zanella; Rogério M Dallago; Cristiane V Preste

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 78 KB
• Volume: 56
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/1526-4998(200009)56:9<804::aid-ps194>3.0.co;2-l

✦ Synopsis

A ¯ow injection spectrophotometric method for the determination of carbofuran in commercial pesticide formulations was developed. The determination involves on-line hydrolysis of the extracted carbofuran at room temperature with sodium hydroxide. The resulting carbofuran-phenol is coupled with diazotized 4-aminobenzoic acid in order to achieve an appropriate selectivity and sensitivity for the spectrophotometric measurements. The calibration curve is linear over the range 1± 10 mg litre À1 of carbofuran. The proposed method has a detection limit of 0.15 mg litre À1 of carbofuran and a sample frequency of 120 injections per hour. The relative standard deviation of six independent determinations of a sample containing 1 mg litre À1 carbofuran was 0.6%. The suitability of the proposed procedure for the determination of carbofuran in commercial pesticide formulations was studied. The procedure provides results comparable to those obtained by liquid chromatographic analysis.