FIELD: chemistry.
SUBSTANCE: method involves preliminary concentration of trace elements from ultra-small samples of water and aqueous solutions. A microgranule of hydrophilic material is placed on a stretched radiotransparent hydrophobic film, a droplet of the analysed solution is collected and then deposited on said film to coat said microgranule. Said droplet is evaporated and the microgranule is then analysed by an X-ray fluorescent microanalyser with a focusing X-ray lens. Before placing the microgranule, the film is smeared with a liquid surfactant which is insoluble in water and aqueous solutions. 1-5% concentrated nitric acid or chloric acid is added to the droplet of the analysed solution or said droplet is taken from the analysed solution to which nitric acid or chloric acid has been added until achieving concentration thereof of 1-5%.
EFFECT: fewer analytical errors.
3 cl, 1 tbl, 8 dwg, 4 ex
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