METHOD FOR DETERMINING POLYORGANOSILOXANES BY MEANS OF HIGH-RESOLUTION ATOMIC ABSORPTION SPECTROMETRY WITH A CONTINUOUS SPECTRAL SOURCE IN THE MODE OF ELECTROTHERMAL SAMPLE ATOMISATION Russian patent published in 2022 - IPC G01N21/31 

FIELD: testing.

SUBSTANCE: area of application: determining the mass concentration of polyorganosiloxanes by silicon. The substance of the invention consists in conducting preliminary liquid-liquid extraction of polyorganosiloxanes by a solvent from the analysed water sample; concentrating the extracts according to the evaporation technology in a vortex gas flow; creating a protective coating for a graphite furnace from hard-alloy tungsten carbide at the sample dosing point in order to prevent interaction of silicon with the carbon of the furnace and formation of silicon carbide; subjecting the silicon to thermal stabilisation in the presence of a mixed palladium-magnesium modifier in nitrate form, forming two "thick" sample layer areas: an area of chemical interaction with the surface of the atomiser, constituting the lower area wherein the palladium nitrate forms an individual connection with the elementary form of an analyte and is itself present in the elementary form, and an area not adjacent thereto, constituting the upper area wherein the magnesium nitrate forms an individual connection with the oxide form of the determined element and is itself present in the oxide form; setting the optimal temperature and time programme of the atomiser and instrumental parameters for determining colloidal forms of silicon using natural water; building the calibration dependence A_int = f(C_Si(POS)), wherein A_int are the integral absorption values, C_Si(POS)) is the concentration of polyorganosiloxanes by silicon, conducting the measurement process; calculating the concentration of polyorganosiloxanes by silicon according to the calibration dependence A_int = f(C_Si(POS)) in mg/dm³.

EFFECT: provided possibility of identifying and determining microplastics, polyorganosiloxanes by silicon in water and aqueous solutions by means of high-resolution atomic absorption spectrometry with a continuous spectral source and an electrothermal technique for sample atomisation with an acceptable margin of error.

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