METHOD FOR DETERMINING ISOTOPE COMPOSITION OF BORON-CONTAINING MATERIALS Russian patent published in 2023 - IPC B01D59/44 C01B35/00 G01N1/28 

FIELD: mass-spectrometric analysis of materials in the solid state.

SUBSTANCE: invention is related to a method for analysing the content of boron and its isotopes in boron-containing materials. The method for determining the isotopic composition of boron-containing materials by laser mass spectrometry includes preparing a sample of boron-containing material, performing mass spectrometric measurements when the boron-containing material (the analysed sample) is exposed to laser radiation, calibrating by the method of standard samples and determining the isotopic composition of the test substance. Preparation of a sample of boron-containing material is carried out by chemical conversion of the initial boron-containing material into boric acid, the resulting product is transferred to a metal substrate and, if necessary, the deposited product is dried on said substrate under normal conditions, then the resulting sample with a metal substrate is transferred to the stage of heating up to 700-800°C with subsequent placement of the prepared sample into the working chamber of the mass spectrometer. The local effect of laser radiation on the surface and near-surface layer of the investigated metal substrate is carried out at randomly selected points, the ionization of the substance under study is carried out, the ion current is recorded on the detector of the mass spectrometer and the peak amplitudes are determined, which are proportional to the actual content of boron isotopes. The isotopic composition of the studied boron-containing material is determined mathematically in form of a percentage of the atomic ratio of boron isotopes, and calibration using a standard sample of boric acid to determine the correction factors is carried out before and after the study of the analysed sample.

EFFECT: simplification of the process of determining the isotopic composition of boron-containing materials and improvement of measurement accuracy.

1 cl, 1 dwg