FIELD: chemistry.
SUBSTANCE: invention relates to analytical chemistry using inductively coupled plasma atomic emission spectrometry. Method includes decomposition of analyzed sample when heated by a mixture of concentrated hydrogen fluoride, hydrogen chloride and nitric acid, taken in volume ratio of 5:15:5 respectively, elimination of interfering effect of compounds of tungsten, molybdenum and iron by adding to solution, obtained during decomposition of sample, 75–80 cm3 acetic acid and a lead acetate solution, taken in molar ratio Pb2+/W6+(Mo6+)>1, l, respectively, followed by addition of an alkali metal hydroxide to pH = 4.4–4.6, separation of solution by filtration and determination of arsenic content in filtered solution by atomic emission spectrometry with inductively coupled plasma at wave length of 189.042 nm, and antimony - at wavelength of 206.836 nm.
EFFECT: higher accuracy of analysis.
1 cl, 1 ex, 1 tbl, 1 dwg
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