Comparison of three analytical procedures for determination of organochlorine pesticides and their by-products in water suspension during photocatalytic oxidation

A comparison of three analytical procedures for the determination of lindan e, p,p'-DDT and methoxychlor in water suspension during their photocatalyti c oxidation in the laboratory photochemical reactor was performed. Analysis of the pesticides was carried out by: liquid-liquid extraction, direct aqu eous injection, and solid phase microextraction using gas chromatography wi th electron capture detector, flame ionisation detector, and mass selective detector. Liquid-liquid extraction has given the best results because of g ood accuracy, precision, good recoveries of pesticides and the possibility to determine pesticides and their by-products in aqueous suspension.