The sample was aspirated by two series-connected probes/samplers containing sorbent XAD - 7 [43]. Absorbed substances were extracted with methanol in an ultrasonic chamber. Allocation was performed on a Rtx-35 MS column, measuring 30 m x 0.25 mm x 0.25 microns. Oven Temperature program includes the following steps: 35°C for 2 min; 12°C/min to 180°C; 30°C/min to 280°C, 280°C for 2.58 min. Ions with a ratio m/z corresponding to the molecular ions of phenol (m/z = 94), cresols and anisole (m/z = 108), dimethylphenols (m/z = 122) and trimetylphenols (m/z = 136) were selected. Moreover, scanning was performed for m/z from 50 to 300 m in order to detect other impurities.