title: Spectrophotometric determination of flucythrinate (synthetic pyrethroid) using phenylhydrazines.
abstract: Three spectrophotometric methods are described for determining flucythrinate, based on formation of coloured compounds when one of the hydrolysed products of flucythrinate is condensed with 2,4-dinitrophenylhydrazine (2,4-DNPH), 4-nitrophenylhydrazine (4-NPH) or 2,4,6-trinitrophenylhydrazine (2,4,6-TNPH) in the presence of methanolic potassium hydroxide. These coloured compounds absorb strongly at 465 nm (2,4-DNPH), 540 nm (4-NPH) and 485 nm (2,4,6-TNPH). The methods are applicable over the range 0.1-8.0 mug/ml for 2,4-DNPH, 0.5-6.5 mug/ml for 4-NPH and 0.1-6 mug/ml for 2,4,6-TNPH. The methods are rapid, sensitive and selective and can be used for microdetermination of flucythrinate in a commercial formulation, water, grains and crop samples.
authors.affiliation: Department of Chemistry, School of Mathematical and Physical Sciences, Sri Venkateswara University, Tirupati-517 502, Andhra Pradesh, India.
authors.forename: R V
authors.initials: RV
authors.lastname: Raju
authors.forename: R R
authors.initials: RR
authors.lastname: Naidu