THE EFFECT OF VARIATIONS IN THE GENERAL COMPOSITION OF SAMPLES IN SPECTROGRAPHIC ANALYSIS

Publisher Website
Google Scholar
Abstract
Variations that occur in intensity ratios belonging to pairs of elements on the addition of various extraneous substances to standard samples have been studied using a common type of condensed spark discharge. The extent of the variations depended on the test elements chosen, the nature of the added substance, the line pair investigated, and on whether or not the standard samples were buffered. The variations bore no apparent relation to the relative ionization potentials or atomic weights of the test elements, nor to any physical property of the added substances. In general, they were smaller for the line pairs having the most nearly equal excitation potentials. Usually, but not always, they were smaller for buffered than for unbuffered samples. Illumination of the electrodes with ultraviolet light, though resulting in steadier operation of the discharge, or alterations of the capacity in the sparking circuit did not reduce the variations materially. Operation of the discharge at constant current coupled with the use of a buffer however did reduce the variations considerably for the instances studied.
Keywords

This publication has 0 references indexed in Scilit: