Optimization and comparison of MAE, ASE and Soxhlet extraction for the determination of HCH isomers in soil samples

The microwave-assisted extraction (MAE), accelerated solvent extraction (AS E) and Soxhlet extraction of two isomers of hexachlorocyclohexane, alpha-HC H and gamma-HCH, from a polluted landfill soil have been optimized followin g different experimental designs. In the case of microwave-assisted extract ion, the following variables were considered: pressure, extraction time, mi crowave power, percentage of acetone in n-hexane mixture and solvent volume . When ASE extraction was studied the variables were pressure, temperature and extraction time, Finally, the percentage of acetone in n-hexane mixture and the extraction time were the only variables studied for Soxhlet extrac tion. The concentrations obtained by the three extraction techniques were, within their experimental uncertainties, in good agreement. This fact assur es the possibility of using both ASE and MAE techniques in the routine dete rmination of lindane in polluted soils and sediments.