METHOD OF QUANTITATIVE DETERMINATION OF COAL DUST IN AIR Russian patent published in 2018 - IPC G01N31/02 

FIELD: ecology.

SUBSTANCE: first determine the coal dust in the presence of inorganic dust with a density of more than 1.65 g/cm³. In this case, a solvent of carbon tetrachloride or chloroform is added to the dust sample, mixed, defecate, the supernatant is decanted into a pretared glass, the carbon tetrachloride is evaporated and the residuum is weighed. Then, if there are other organic dusts in the air with a density of less than 0.9 mg/cm³, ethanol is poured to the sample of dust into the pretared after evaporation of the solvent glass, mixed, defecated, the supernatant is decanted, ethanol is evaporated and the residuum is weighed.

EFFECT: invention provides a selective determination of coal dust from other components of dust of complex composition when controlling atmospheric air, based on the different density of the components being determined.

2 cl, 1 tbl, 1 ex