Determination of carbofuran in pesticide formulations by flow injection spectrophotometry

• Published in: Pest management science Vol. 56; no. 9; pp. 804 - 808
• Main Authors: Zanella, Renato, Dallago, Rogério M, Preste, Cristiane V
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.09.2000; Wiley; London :John Wiley & Sons Ltd
• Subjects: analysis; Biological and medical sciences; carbofuran; Chemical control; Control; flow injection spectrophotometry; formulations; Fundamental and applied biological sciences. Psychology; Phytopathology. Animal pests. Plant and forest protection; Protozoa. Invertebrates; Nematicide; Carbofuran; Insecticide; Analysis method; Formulation; Detection limit; Pesticides; Benzofuran derivatives; Pesticide formulation mixture; Spectrophotometry; Carbamate; Flow injection
• ISSN: 1526-498X; 1526-4998
• DOI: 10.1002/1526-4998(200009)56:9<804::AID-PS194>3.0.CO;2-L

A flow 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−1 of carbofuran. The proposed method has a detection limit of 0.15 mg litre−1 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−1 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. © 2000 Society of Chemical Industry