A method using dispersive solid-phase extraction (d-SPE) cleanup followed by QuEChERS with High Performance Liquid Chromatography (HPLC) has been established for determination of Neonicotinoid pesticide residues in various vegetables including brinjal, salad leaves, coriander, cabbage and lady finger. Based on an assessment of the HPLC characteristics, validation experiments are conducted for three Neonicotinoid pesticides i.e. Nitenpyram, Imidacloprid and Acetamiprid. In acidified acetonitrile analytical extraction is done with NaCl and MgSO₄ followed by activated neutral carbon. The method show good linearity (R2 ≥ 0.999) and relative standard deviation (RSD ≤ 3.36%). Average recoveries of three insecticides are in the range of 55% to 82% at spiking levels of 275.68 to 409.3 mg.Kg^-1. LOD and LOQ of three Neonicotinoid pesticides are in the range of 2.658-3.761 mg.Kg^-1 and 8.056-11.4 mg.Kg^-1. This QuEChERS determination method by HPLC is precise, simple, sensitive, accurate, easy to perform, and diversified at slightly higher concentrations. Moreover, it is very efficient and effective method and it can be utilized for regular monitoring of pesticide residues in drinking, canal and river water to save the life of organisms and to keep the aquatic environment clean.

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