FIELD: environment protection technologies.
SUBSTANCE: method includes extraction of sample by n-hexane. Extraction is performed once by 15 ml of n-hexane mixture with hydrophilic organic solvent in relation 10:1 in ultrasound bath during 5 min or on magnetic mixer during 15 min. Extract is steamed until dry, and dry remainder is dissolved in benzene.
EFFECT: increased precision of analysis due to better extraction of hydrocarbons.
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