METHOD OF MEASURING CONCENTRATION OF NITRIC ACID IN AIR AND DEVICE FOR ITS REALISATION Russian patent published in 2014 - IPC G01N27/64 

FIELD: chemistry.

SUBSTANCE: claimed is method of measuring HNO₃ concentration in air, in which, in accordance with the invention, air, containing nitric acid vapours, is passed through cold reactor; current (background) concentration of NO₂ in air is measured and its value is stored in microprocessor unit as C₁, then reactor is heated to temperature 250-350°C, concentration of NO₂, separated in the process of thermal HNO₃ decomposition, is measured, its value is stored in microprocessor unit as C₂ and concentration of nitric acid vapours in air in determined by specific formula. Also claimed is device for realisation of method, described above, which contains air-intake pipe (1), flow booster (5) for air pumping, sensor (4) for measuring NO₂ concentration in air and microprocessor unit (8) for control of device operation and memorising values of NO₂ concentration, in which, in accordance with the invention, reactor (2) with periodically heated catalyst is installed at inlet into air intake pipe (1).

EFFECT: method improvement.

4 cl, 2 dwg