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The effects of various factors (composition of mixture, relationship between the mass of mixture and sample, value of the Ni : S ratio, fusion time, and temperature) on the conditions of the fire assay concentration of the noble metals with nickel sulfide were investigated, and a method proposed for their quantitative separation from different geological matrices with a neutron activation determination for up to 10-1-10-3 ppb. The proposed method is used to analyse geological samples, i.e., ores, stones, iron meteorites, chromites, soil and lunar rocks.

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