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The 16-Á bandpass used for the measurement of thorium would allow the passage of a number of relatively strong Th11 lines as well as a few moderately strong Th1 2lines. The sensitive hafnium line at 5311.6 Á, is an ion line. Some elements exhibit maximum sensitivity using band emission, but this is limited in its selectivity. Thus, for example, marked improvement in sensitivity is found with band emission from iridium, in addition to boron and uranium. Beryllium also shows fivefold higher sensitivity at the BeO 4708.6 A band.Most of the detection limits reported here can undoubtedly be improved by using organic solvents (7), although there is increased danger of chemical interference (4). Where applicable, flame emission spectrometry with the nitrous oxide-acetylene flame offers decreased chance of chemical interference for those elements (somewhat over half) that are normally determined in cooler flames by atomic absorption spectrometry.

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