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In this paper, a zinc sulphide nanoparticles loaded on activated carbon (AC) (ZnS-AC) as well as 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF₆]) ionic liquid using sol gel technique was used as the adsorbent for the stir bar sorptive extraction (SBSE) of N-methylcarbamates (NMCs) (carbofuran, carbaryl and promecarb) in water samples followed by high performance liquid chromatography-ultraviolet detection (HPLC-UV). The fractional factorial design (FFD) was used to find the most important factors, which were then optimized by the central composite design (CCD) and response surface methodology (RSM). At optimum conditions values of factors set as 2.75% (w/v) NaCl, 23 min extraction time, 300 μL methanol (as desorption solvent), natural pH, and 500 rpm stirring speed. Under the optimal experimental conditions, the proposed method has linear ranges over 0.002–30 μg mL^− 1 with …