METHOD OF DETERMINING ORGANIC COMPOUNDS, MAINLY SORBED FROM ROOM AIR Russian patent published in 2025 - IPC G01N27/407 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry and can be used to control surface cleanliness of technologically important articles when these articles are in the atmosphere of a room. Method of determining organic compounds, mainly sorbed from room air, includes feeding an analysed sample into a reactor, moving, according to a computer program, a sample in the reactor in an air flow along the furnace from a zone with room temperature to a high-temperature zone of the reactor, where there is oxidation of organic compounds in the sample; determination of oxygen concentration in air flow at reactor inlet and outlet; trapping non-oxidised molecules of carbon compounds on a catalyst at the outlet of the reactor. Obtained data are used to determine the amount of organic compounds in the sample. Before feeding air into the reactor, it is cleaned of organic compounds and microparticles. Analysed sample is obtained on the surface of a substrate. Sample is introduced into a high-temperature zone with temperature of 680-880 °C, simultaneously with heating, carbon dioxide is additionally recorded in the air flow leaving the reactor. After the concentration of oxygen and carbon dioxide returns to the background values of the purified air, the amount of organic compounds in the sample is determined from the area of the peak of the total release of carbon dioxide relative to its background content at the outlet to the reactor. Surface concentration of organic compounds in the sample is determined from the ratio of the area of the peak of the total release of carbon dioxide to the area of the substrate. Before determining organic substances in the sample, the substrate is purified from organic impurities and the sample is deposited on the cleaned substrate.

EFFECT: possibility of determining total (integral) content of organic compounds on the surface of a solid body, which are passively sorbed for a given time from room air.

8 cl, 4 dwg, 1 tbl