FIELD: analytical chemistry.
SUBSTANCE: invention relates to analytical chemistry. A method for determining furan and methylfuran in atmospheric air by capillary gas chromatography with a mass selective detector includes taking an air sample by pumping it through a sorption tube filled with a Tepah polymer sorbent, followed by thermal desorption and chromato-mass spectrometric analysis, taking a chromatogram and determining the content of furan and methylfuran according to the calibration curve. Air sampling is carried out by pumping air through a sorption tube pre-cooled to a temperature ranging from minus 10°C to minus 15°C, at a rate of 100 ml/min for 5 min. The sorption tube with the sample is subjected to thermal desorption. To do this, the sorption tube is placed in a thermal desorber, the tube is heated to 230°C, after which a flow of carrier gas, nitrogen, is passed through the second end of the tube for 10 minutes at a rate of 20 cm3/min. In the trap, the sample is subjected to heating at 250°C for 2 min and the sample is analyzed on a gas chromatograph, a chromatogram is taken, determining the peak area, the retention time for furan is 4.2 min, for methylfuran 6.06 min, and the concentration of furan and methylfuran in air is determined using a calibration curve. At the same time, the analysis of a concentrated air sample is carried out on a gas chromatograph with a mass spectrometric detector and a capillary column of the brand DB-5MS 60 m ⋅ 0.250 mm ⋅ 0.250 μm, 60 meters long, with an inner diameter of 0.250 mm and a film thickness of the stationary phase of 0.250 μm, under certain modes.
EFFECT: creation of a highly sensitive and selective method for monitoring furan and methylfuran in atmospheric air with low detection limits.
2 cl, 1 dwg, 8 tbl
