Abstract
The sample is placed into the capillary of a gas discharge tube operated under standardized conditions. The emission spectrum is investigated from 3500 to 8500A. Intensity marks are printed on each plate. The blackening of the Rb and K lines is measured. Equivalent amounts of RbCl and KCl in the sample are obtained graphically from curves derived from standard samples. The method seems of special interest in cases where small samples only are available.

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