Strontium flame-emission determination in powder samples of rocks

A direct method of emission analysis of powder samples of rocks for Sr content with an aid of ''graphite capsule-flame'' atomizer is suggested. Silicate and carbonate rocks serves as objects for the study. It is established that the maxiMum emission signal is observed at summary flow rate of gases of the combustible mixture (acetylene-air) of 360 l/hr and when a slightly reducing flame is applied. According to the results of 10 parallel determinations of Sr the variation coefficients, varying from 8 to 15%, are calculated. The absolute limit of strontium determination in the mixtures analyzed constitutes 5.0x10-9 g. It has been found according to the trebled value of the standard deviation of the minimum recorded sianal