METHOD OF DETERMINING CONCENTRATION OF ACROLEIN IN AIR BY METHOD OF HIGH PERFORMANCE LIQUID CHROMATOGRAPHY Russian patent published in 2015 - IPC G01N30/02 

FIELD: chemistry.

SUBSTANCE: first, sampling of atmospheric air is performed at rate 0.5 l/min for 30 minutes by its drawing through two successively connected absorption devices, placed on water bath with temperature +92°C and preliminarily heated for 3 minutes on water bath at temperature +92°C, each of which contains absorption solution. Said solution consists of 3-aminophenol with molar concentration 0.023 mol/dm³, hydroxylamine hydrochloride with molar concentration 0.086 mol/dm³, iron sulphate solution with weight concentration 5.6 mg/cm³, 16% water solution of sulphuric acid and distilled water with their volume ratio 10:5:1:1:3 respectively. After that, additional heating of sample is realized , located in absorbers, for 10 minutes at the same temperature, with further combination of contents from both absorbers and concentration of sample by means of vacuum concentrator at temperature +40°C and analysis on liquid chromatographer with fluorimetric detector, with application as mobile phase of mixture of water and composition, consisting of acetonitrile and methanol with their volume ratio 3:1 respectively, with their changing ratio within 10 minutes from 100:0 vol % of water and composition to 90:10 vol % of water and composition; supply of mixture of 90 vol % of water and 10 vol % of composition for 12 minutes with further reduction of volume quantity of composition in mobile phase after stopping distillation at 22 min to 0 vol % and further passing such mobile phase through column for 5 minutes. Said procedures are carried out with blank sample without air sample as well, with concentration of acrolein in air being determined by graduation graph taking into account bringing volume of air, sampled for analysis, to normal conditions, with true concentration of acrolein being determined by difference of data obtained for sample with air and blank sample.

EFFECT: increased sensitivity and selectivity with provision of extension of range of acrolein detection.

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