Photochemical–spectrofluorimetric determination of two pyrethroid insecticides using an anionic micellar medium

Abstract

The effect of sodium dodecyl sulfate (SDS) micelles on the photochemically induced fluorimetric (PIF) method was investigated in the determination of fenvalerate and deltamethrin insecticides. Physical and chemical variables affecting the sensitivity of the method were optimized. Linear calibration curves were established over more than two orders of magnitude. The limits of detection were 2.2–2.5 times lower in SDS micelles than in common organic solvents. The RSDs were between 3.7 and 5.2%. Application of the method to the analysis of commercial technical formulations and spiked water samples was evaluated. Satisfactory recoveries were found, ranging from 88.4 to 112.6%. The possible origins of the observed PIF enhancement effect in micellar solution are discussed.