Mitsuru Idohara1, Nakaaki Oda1 and Masao Dairi1
1Physical and Chemical Research Laboratory, Nippon Soda Co., Takaoka
In a previous paper, a spectrographic method in general use with a fixed analytical condition and a set of standards was established for a rapid, simultaneous and precise determination of major and impurity elements in samples with various matrices, encountered in industries. An improvement of the previous method was studied on internal standards and analytical line pairs to reduce the relative deviation, and also influences of compositions and chemical forms of samples on the analytical results by the improved method were fully investigated. As the result, better precision was obtained by use of the double internal standard of germanium and platinum and the optimum analytical line pairs, and it was found that the analytical results were little affected by the character of the sample matrices such as organic, inorganic and metallic materials, as well as by the chemical forms of analytical elements such as carbide, oxide, metal and various salts. The analytical precision was less than 20% in terms of the variation coefficient at the concentration level of 3%, and the results by this method agreed satisfactorily with those by chemical analysis, so this method could be widely used for industrial applications.
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