METHOD FOR DETERMINING MASS CONCENTRATIONS OF IMPURITIES IN ATMOSPHERIC AIR BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY Russian patent published in 2021 - IPC G01N1/28 G01N33/00 

FIELD: analytical chemistry.

SUBSTANCE: invention relates to the field of analytical chemistry. Disclosed is a method for determining mass concentrations of impurities in atmospheric air using inductively coupled plasma mass spectrometry, characterized by the fact that atmospheric air sampling is carried out by drawing the test air through a filter, after sampling, the filter is decomposed by microwave sample preparation, the resulting mineralization is transferred to a polypropylene tube, where the sample is diluted with deionized water, the finished sample is transferred to a vial and placed in an auto-sampler of an inductively coupled plasma mass spectrometer and measured, the element concentrations are calculated by the calibration graph method, taking into account the reduction of the volume of the selected air to normal conditions. At the same time, an analytical filter made of mixed cellulose esters is used as a filter, air is drawn for 20-30 minutes with a volume flow of 20 dm³/min, at the end of the process, a glass with a mineralized matrix is placed in a clean room free of particles of the determined elements, where the glass is opened and kept until the release of nitrogen oxides stops, the sample is diluted with deionized water of class I purity to a volume of 50 cm³, where the determined impurities include lead, cadmium, iron, nickel, aluminum, antimony, cobalt, copper, magnesium, manganese, and chromium.

EFFECT: invention provides an increase in the number of detectable chemical elements in the air, a decrease in the detection limits and an increase in the accuracy of the determination of impurities.

2 cl, 2 tbl, 1 ex