Spectra produced in the d.c. arc with graphite or carbon electrodes suffer from cyanogen interference between 3500 and 4150 <i>A</i> as well as poor line-to-background ratio in the ultraviolet region (1). In order to take advantage of the sensitivity of the d.c. arc method, a chamber for exciting the sample in a nitrogen-free controlled atmosphere eliminates the cyanogen interference and increases the line-to-background ratio.

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