FIELD: chemistry.
SUBSTANCE: sample is revealed with a mixture of concentrated hydrochloric and nitric acids (3:1) at a ratio of sample weighed portion to mixture of acids of 1:(100-120) when heating for 1-1.5 hours. Resulting mixture comprising a solution of impurity elements and insoluble basis is cooled and treated with a mixture of concentrated perchloric and hydrofluoric acid (3:5) at a ratio of the initial sample weighed portion to mixture of acids of 1:(110-130) when heating until the perchloric acid vapours appear. Then the mixture is treated with nitric acid diluted with deionized water 1:1 at a ratio of the initial weighed portion of 1:(100-120).
EFFECT: resulting mixture comprising a solution of impurity elements and insoluble basis of analyzed sample is diluted with deionized water, impurity solution is separated from the insoluble basis by filtration and the content of impurity elements is determined therein by atomic-emission method with inductively-coupled plasma.
1 tbl, 1 ex
