English

Abstract

Column solid phase extraction (SPE) and batch procedures based on the use of synthetic hydrotalcite (HT) or layered double hydroxides (LDH) as solid phase for adsorption and extraction of Methomyl (MEL) and Imidacloprid (IMP) pesticides in water are investigated. The determination of the pesticides was carried out by high performance liquid chromatography (HPLC). The study was performed to determine the influence of various operating parameters, such as initial concentration, contact time, pH, and sorption capacity, on the procedure performance. The results indicated that calcinedhydrotalcite of the type Ni/Al-NO3 is proved to be promising with sorption capacity (up to 43.02 mg g -1 at pH 4.5) for extracting pesticides from aqueous samples. Spiked water samples were tested by batch method and by passing the samples through the calcinated Ni-Al, HT column (500 mg) at a constant flow rate (4 mL min -1 ). Adsorbed analytes were eluted with acetonitrile and analyzed by HPLC. Acceptable high recoveries with simple, reliable and sensitive HPLC procedure were obtained for the analysis of Methomyl and Imidacloprid in water samples.