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A combined method for the determination of trace elements is described. Chemical separation and concentration of the impurities is followed with spectrographic analysis by means of the graphite spark.
The method based on synthetic standards has been applied successfully to the determination of parts per billion quantities in semi-conductor materials.
An outline of the chemical concent rational procedures is given. The spec-trographic techniques of the graphite spark method are described and the excitation conditions, the line pairs, and the sensitivities are listed.
Metal Hydrides, Inc., Beverly, Mass.
Chief Spectroscopist, National Research Corp., Cambridge, Mass.