| 摘要 |
FIELD: ecology; analytical chemistry. ^ SUBSTANCE: method includes sampling, concentration of volatile impurities, chromatographic analysis including the concentrate separation on a capillary column with a polar stationary liquid phase and flame-ionisation detection with holding at 60° C, temperature rise at a rate of 10° C/min to 120° C and holding at this temperature, isolation of toluene and 1,2,4-trimethylbenzene as reference compounds, determining proportion of their concentrations in the sample, and calculation of the time of petrol-to-water contact by the formula: x = (2.27 - y)/ 0.023 where x is the time of petrol-to-water contact, hours; y is Stoluene/S1,2,4 - TMB, Stoluene and S1,2,4 - TMB - concentrations of toluene and 1,2,4-trimethylbenzene in the sample corresponding to areas of the peaks in the chromatogram. ^ EFFECT: higher reliability of determination. ^ 2 ex, 2 tbl |
