Abstract
Indium can be determined more sensitively in argon (entrained air)— and nitrogen (entrained air)—hydrogen flames than in air—acetylene or air—hydrogen flames. The indium sensitivity (for 1% absorption) is 0.075–0.082 p.p.m. at 303.9 nm and the calibration graphs are linear up to 10 p.p.m. Many foreign elements interfere with the determination, but the addition of magnesium halides is very effective in eliminating interferences from other elements, with the exception of silicon and vanadium. This finding was satisfactorily applied to the determination of indium in some semi-conducting III–V compounds. It is suggested that indium atoms are produced in the cool flames by dissociation of InH molecules, the production of which is enhanced by a large amount of magnesium halide.
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