Studies on the Flame Spectrochemical Analysis. X : Influences of Some Diverse Substances on the Flame Spectra of Alkaline Earth Metals

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The influences of phosphoric acid, sulfuric acid and chromium ion on the flame spectra of alkaline earth element were studied systematically. These substances were found to reduce the radiation power of the spectra when they were added to the solution of alkaline earth element to be determined, but the influences became constant when the concentration of them became above the definite ratio of each substance to the alkaline earth element being measured. From these results it was assumed that these substance might combined with alkaline earth element in the flame and this caused the depression of spectral emission owing to the reduction of free alkaline earth elements. The combination of alkaline earth elements with each substance was as follows : i) Alkaline earth element to phosphorus was 3 to 2 in molar ratio. ii) Alkaline earth element to chromium was 1 : 1 in molar ratio. iii) Alkaline earth element to sulfuric acid was 1 : 1 in molar ratio.
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