AUTOMATED METHOD FOR THE DETERMINATION OF FORMALDEHYDE Russian patent published in 2022 - IPC G01N21/64 

FIELD: analytical chemistry.

SUBSTANCE: invention relates to analytical chemistry and can be used for automatic highly mobile environmental monitoring. The automated method for determining formaldehyde consists in the automatic determination of formaldehyde, consists of one of the well-known highly sensitive reactions of complexes of reagents with formaldehyde, leading to the formation of light-absorbing and fluorescent complexes, where a gaseous sample of formaldehyde in a flow mode is in contact with a 0.2-0.4% cold solution of sulfuric acid. acids with a temperature of 5-15°C to transfer formaldehyde from the gas phase to the liquid phase, and differs in that the necessary reagents are fed into the reaction chamber in real time and conditions are created for the complete reaction to proceed, and then bubbles are removed from the resulting solution using a degasser gas and it is fed into the flow cell, while in order to reduce the size of devices using the method as a light source and monochromator, an LED is used, and in the case of fluorescence, an emitted light monochromator is a miniature prism, then at the final stage the entire system is washed with distilled water, and for recording signals and processing the measurement results, it is fed to specialized software.

EFFECT: automation of the process of determination of formaldehyde concentrations without operator control.

1 cl, 1 dwg