METHOD FOR DETERMINATION OF ANTIMONY AND ARSENIC IN FERRO-TUNGSTEN AND FERROMOLYBDENUM

摘要

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