SEMIQUANTITATIVE SPECTROGRAPHIC ANALYSIS OF TUNGSTEN
TL;DRAbstract
A spectrographic procedure applicable to the semiquantitative deterimination oi 29 elements in tungsten is presented. The imethod is designed to give estimates of impurity concentrations up to 500 ppm. Limits of detectability range from 0.3 ppm for the more sensitive elements to l00 ppm for the less sensitive ones. Tungsten metal samples . varying in particle size froim minus 300 to 30 mesh are excited in ti:e presence of 5% germanium with a direct current arc. Germanium acts to stabilize the arc, minimizes the volatilization of tungsten, and serves as an efficient carrier to sweep impurities from the tungsten into the excitation zone. Curves are presented that show the volatilization behavior of germanium, tungsten, and impurities in tungsten at different concentration levels. Data obtained were used as guides in establishing the method of analysis. It is believed that this spectrographic method should prove helpful in evaluating high-purity tungsten. (P.C. H.)
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A spectrographic procedure applicable to the semiquantitative deterimination oi 29 elements in tungsten is presented. The imethod is designed to give estimates of impurity concentrations up to 500 ppm. Limits of detectability range from 0.3 ppm for the more sensitive elements to l00 ppm for the less sensitive ones. Tungsten metal samples . varying in particle size froim minus 300 to 30 mesh are excited in ti:e presence of 5% germanium with a direct current arc. Germanium acts to stabilize the arc, minimizes the volatilization of tungsten, and serves as an efficient carrier to sweep impurities from the tungsten into the excitation zone. Curves are presented that show the volatilization behavior of germanium, tungsten, and impurities in tungsten at different concentration levels. Data obtained were used as guides in establishing the method of analysis. It is believed that this spectrographic method should prove helpful in evaluating high-purity tungsten. (P.C. H.)
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