FIELD: chemical or physical processes.
SUBSTANCE: present invention relates to methods of identifying marked hydrocarbon liquids. Method of identifying a hydrocarbon liquid containing a gas chromatography marker, which contains a non-pyrrolidinone nitrogen-containing compound, involves introducing a sample of a hydrocarbon liquid into a gas chromatographic system to obtain a gas chromatographic characteristic of the sample and identifying the presence of a non-pyrrolidinone nitrogen-containing compound in the hydrocarbon liquid using the gas chromatographic characteristic.
EFFECT: possibility of laboratory confirmation of marker presence.
20 cl, 1 dwg
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