Application of an optimized modified stir bar with ZnS nanoparticles loaded on activated carbon for preconcentration of carbofuran and propoxur insecticides in water samples and their HPLC determination

摘要: In this study, the stir bar was coated with ZnS-NPs loaded on activated carbon (AC) (ZnS-AC) as well 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF6]) ionic liquid (IL) using a sol gel technique which used for sorptive extraction (SBSE) of carbofuran and propoxur. The extracted analytes were then quantified by high performance chromatography (HPLC) equipped an ultra violet detector. best propoxur obtained through optimization factors affecting SBSE including pH sample solution, strength, time, volume desorption solvent, stirring speed. fractional factorial design (FFD) to find most important factors, optimized central composite (CCD) desirability function (DF). Under optimal experimental conditions, proposed method has linear ranges over 0.002–30 μg mL−1 detection limits 0.0003–0.0005 good RSDs (and n = 6) 3.3–4.5% enrichment (EFs) in range 75.6–81.6-fold developed been successfully applied determination two N-methylcarbamate environmental water samples such tap water, river mineral water.