Rapid kinetic spectrophotometric determination of phosalone (Zolone) in a commercial formulation.
A kinetic study of the degradation of phosalone in an alkaline medium was undertaken by using a pneumatic stopped-flow system. A rapid semiautomatic method is proposed for determining phosalone. Linear calibration graphs up to 8.0 x 10(-5) M (detection limit = 1.40 x 10(-6) M) were obtained, with a measurement period of only 3.5 s per sample and a relative standard deviation of 1.4%. Several pesticides were assayed as interference species, and several did not interfere even at a 6:1, M:M foreign species/phosalone ratio. A strong interference (ratio < 1) was generated by azinphos-methyl and carbaryl. The proposed method was applied to the analysis of a commercial formulation, and the results were validated by comparison with those for a chromatographic method.
Espinosa-Mansilla
A
A
University of Extremadura, Department of Analytical Chemistry, Badajoz, Spain.
Guiberteau Cabanillas
A
A
Salinas
F
F
Mora
N
N
Zamoro
A
A
D004355:Drug Stability; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000032:analysis*; D007700:Kinetics; D009946:Organothiophosphorus Compounds / Q000032:analysis*; D011786:Quality Control; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods*
D007306:Insecticides; D009946:Organothiophosphorus Compounds; C003117:phosalone