Electronic teaching aid . Nizhny Novgorod: NSU, 2012. 64 s. In the training manual, various options for extracting impurities during water analysis are considered. The theoretical basis of liquid-liquid extraction. Particular attention in the manual is paid to liquid-phase microextraction concentration. The manual provides theoretical foundations of an important modern analytical method - gas chromatography with flame ionization and mass spectrometric detection. The manual contains descriptions of laboratory work on chromato-mass spectrometry and gas chromatographic analysis of water using liquid-phase extraction. Electronic teaching aid is intended for UNN students studying in the direction of training 020100 "Chemistry" and specialties 020101 "Chemistry", 240306 "Chemical technology of single crystals, materials and electronic equipment products", 031003. 65 "Judicial Examination" .