| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: method involves mixing an analysed sample with magnesium oxide in ratio 1:2, heat treatment of the mixture by sintering, leaching the sinter with water and hydrogen peroxide while heating to obtain a solution containing perrhenate ions, separating the solution by filtering and measuring radiation intensity on an inductively coupled plasma atomic emission spectrometre, wherein oxidative additives of alkali metal salts are additionally fed for mixing in ratio of the sample to the oxidative additives of 1:2; the obtained mixture is heated in the temperature range of 300-750C and held for 20 minutes; radiation intensity is measured at wavelength 197.248 nm. The oxidative additive of alkali metal salts used is potassium pyrosulphate or sodium nitrate. ^ EFFECT: high accuracy of analysis. ^ 3 cl, 1 ex, 1 tbl |
