FIELD: analytical technology. SUBSTANCE: method involves selective extraction of groups of components on chromatographic paper by means of selective solvents. To this end, sample of oil or its product is placed in cup which is installed in glass cylinder, selective solvent of petrolenes compounds is added to cup with sample, strip of chromatographic paper is dipped in solution so that its lower end shaped to cup configuration comes in contact with its bottom. Upon extraction of petrolenes compounds, cup is removed from cylinder by means of same tool, remaining sample of oil or its product is weighed out, and quantity of petrolenes contained in sample is determined by difference in masses. For determining quantity of other components, all operations are repeated using respective selective solvents. EFFECT: improved validity of analysis. 1 tbl
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