Effects of Additives in the D.C. Arc Spectrographic Discharge.

摘要

Compounds of elements of Groups IV through VII of the periodic table were investigated to determine the effect of the additives upon interelement phenomena and the detection limits of alloying constituents in copper base alloys. The line-to-background ratio of the spectral lines of the elements of interest was used as a measure of the effect of the additives. The additives studied were:ammonium nitrate,ammonium phosphate,ammonium sulfate,bismuth oxide,basic copper fluoride,copper oxide,copper sulfate,germanium oxide,lithium fluoride,potassium chloride,silver chloride,strontium fluoride,sulfur,selenium dioxide,and tellurium dioxide. Graphite was used as a reference,or comparison,additive. It was found that of the different additives tested none produced a significant increase in the line-to-background ratios. The additive that most enhanced the line-to-background ratio was selenium dioxide but only for the following elements:antimony,iron,nickel,and tin;lead and manganese were adversely affected. The Stallwood Jet and cathode-layer techniques were also used,but these techniques adversely affected the line-to-background ratios.