METHOD FOR MANUFACTURING MULTI-COMPONENT REFERENCE SAMPLES FOR X-RAY FLUORESCENCE ANALYSIS OF ROCKS Russian patent published in 2023 - IPC G01N1/28 

FIELD: analytical chemistry.

SUBSTANCE: method for manufacturing multicomponent reference samples for X-ray fluorescence analysis of rocks is disclosed, which includes fusion in a crucible of precious metals of a powder sample of certified standard samples of rocks with a flux, which is a mixture of lithium tetraborate and metaborate, previously placed on the bottom of the crucible, and the introduction of liquid components and non-wetting additive, which is lithium bromide in the amount of 0.5% of the total weight of the powder sample of the certified reference rock sample and flux. The ratio of the powder sample of certified standard samples of rocks and flux is from 1:20 to 1:5, solutions of ions of the elements being determined are used as liquid components; the crucible is placed in a furnace, heated to the boiling point of water and maintained until free moisture is completely removed, then the crucible is gradually heated at a rate of 30°C/min to a temperature of at least 520°C and maintained until hydrated moisture is removed, then the temperature in the furnace is increased from at a rate of 50°C/min to a temperature of at least 1050°C, stirring is done until the sample is dissolved in the flux, then the crucible is removed from the furnace, the melt is poured into heated moulds and cooled to room temperature, then the obtained fused disks are visually inspected, and in case of visual defects of the emitters are sent for remelting.

EFFECT: producing multicomponent reference samples for X-ray fluorescence analysis of rocks, with a given concentration, homogeneous in composition.

1 cl, 1 dwg, 1 tbl, 5 ex