METHOD OF QUANTITATIVE DETERMINATION OF ALUMINIUM, VANADIUM, TUNGSTEN, IRON, CADMIUM, COBALT, MAGNESIUM, MANGANESE, COPPER, NICKEL, LEAD, STRONTIUM, TITANIUM, CHROME, ZINC IN ATMOSPHERIC AIR BY MASS SPECTROMETRY WITH INDUCTIVELY COUPLED PLASMA Russian patent published in 2017 - IPC C01G31/00 G01N1/22 G01N33/20 

FIELD: chemistry.

SUBSTANCE: sample is taken while drawing through an atmospheric air filter. The filter is then decomposed by the sample preparation method in a muffle furnace. A solution of the internal standard is added to the filter, placed in the muffle furnace and held in series at a temperature of 100°C for 40-60 minutes, at a temperature of 250°C for 40-60 minutes and then the ashing is carried out at a temperature of 450-500°C. The ash is wetted with concentrated nitric acid, heated on a sand bath and evaporated to a wet salt state. After cooling, they are dissolved in 5 cm³ of 1% aqueous solution of nitric acid, transferred to a volumetric tube and the resulting volume is adjusted to 10 cm³ by 1% aqueous solution of nitric acid. The sample is placed in the tube of a sampling device of a mass spectrometer with an inductively coupled argon plasma and measurement is carried out using a reaction-collision cell with helium passing through it as a reactant gas, and the concentration of a particular metal is determined using a calibration chart, taking into account the adjustment of the air volume sampled for analysis to normal conditions. In this case, the sample is taken by drawing the test air in a volume of 6-20 m³. Before adding the inner standard solution to the filter, 0.1 cm³ of ethyl alcohol and 0.5 cm³ of 20% solution of ammonium sulfate or potassium disulfate in deionized water are successively injected into a quartz cup. 0.1 cm³ of the internal standard solution injected afterwards contains a mass concentration of the reference element - indium - in an amount of 100 mcg/dm³. Moreover, the ashing in the muffle furnace at a temperature of 450-500°C is carried for 3.0-3.5 hours, and the ashes formed by ashing are wetted with 0.3-0.5 cm³ of concentrated nitric acid with density of 1.415 g/cm³. Measurements in the prepared sample of specific metal content in a mass spectrometer are carried out by passing helium through a reaction-collision cell at a rate of 5.2-5.5 cm³/min. It is possible to determine 15 chemical elements - metals - in atmospheric air from a single sample in a wide range of concentrations at a level from 0.000001 to 5 mg/m³.

EFFECT: expanded ability to determine elements.

5 cl, 9 tbl