ONLINE EXTRACTION METHOD FOR THE ISOLATION OF PESTICIDES FROM INDUSTRIAL-WASTE WATER

The aim of the study was to develop a simple methodology of sample preparation in order to determine pesticides in idustrial waste water. The study was ordered by The Chemical Plant ''Organika-Azot'' in Jaworzno. The method of direct extraction employed in this work and based on literature and the author's own investigations, enables to extract the majority of pesticides by using the system consisting of two solvents of diffrent polarity [1, 2]. The extraction is performed in one vessel and lasts 3-5 minutes. The on-line extraction method is based on salting out effect by the addition of electrolyte to the extracted mixture in order to release pesticides into the organic phase. The extraction of the examined sample and following stages are combined into one process. The obtained extract is dried with Na2SO4, and concentrated to the volume of 1 ml. Finally, the extract is analysed by gas chromatography method.