FIELD: analytical methods. SUBSTANCE: invention, in particular, relates to determining quantitative and individual composition of organochlorine compounds in crude oils, petroleum processing products, and chemical reagents in petroleum production and petroleum processing industries. Mixture to be analyzed is passed with gas carrier stream through evaporator at 220-350 C, separated in capillary column of chromatograph at 50 to 320 C, and detected at 220-350 C in electron-acceptor detector, into which gas carrier is additionally forced at flow rate 200 cu.cm/min, whereupon, from quantitative and individual composition of organochlorine compounds, particular contamination source is found out. EFFECT: lowered detection threshold and increased determination accuracy. 2 cl, 1 tbl
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