We applied closed tube analysis to some minerals, using thin walled glass capillaries in place of tubes of ordinary dimension, samples being placed in the capillaries, alone or together with fluxes-KCN, iodide mixture or hypophosphites. The last fluxes were best available for easy detection of various metals owing to its reducing and coloring reaction.
Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy 3 640-644, 1951