*2.3. Hydrocarbon Biodegradation Analysis*

The assessment of the loss of individual groups of hydrocarbons was performed after 24, 72, and 168 h of biodegradation, and expressed as a share of the concentration of hydrocarbons directly after inoculation. Gas chromatography, coupled with mass spectrometry (GC–MS), was used for the measurements. The detailed method of extracts preparation and analysis conditions are described in a previous publication [8].
