METHOD FOR SAMPLE PREPARATION FOR ANALYSIS OF LOW-VOLATILE OIL-SOLUBLE SUBSTANCES IN OIL AND OIL PRODUCTS

摘要

FIELD: oil and gas industry. ;SUBSTANCE: invention relates to gas chromatographic methods for the analysis of low-volatile oil-soluble substances in oil and oil products and can be used in oil, gas, petrochemical industries and ecology. A method for preparing a sample for the analysis of low-volatile oil-soluble substances in oil and petroleum products includes injecting an initial liquid sample with a syringe into a concentrator in a carrier gas stream for solid-phase extraction at low temperature, while the solvent is blown out into the atmosphere, and after entering a given sample volume, the concentrator is quickly heated and desorbed concentrated impurities into a gas chromatographic column for analysis, and the initial liquid sample is preliminarily evaporated and introduced into the concentrator in the form of vapors, the initial liquid sample is a solution of low-volatile oil-soluble substances extracted from oil with a water-alcohol solvent in a ratio of 3:1 using bubbling mixing, and the initial section of the gas chromatographic column at the time of sample injection is cooled to minus 20°C, and then heated in the linear programming mode of the column temperature at a rate of 10°C per minute.;EFFECT: provided are possibility of gas chromatographic analysis of low-volatile oil-soluble substances directly in oil and oil products, as well as an increase in the degree of enrichment of the analyzed substances.;1 cl, 1 tbl