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Interlaboratory and Interinstrumental Spectrochemical Precision: Comparison of dc Carbon Arc Optical Emission Spectrographic, Atomic Absorption, and X-ray Fluorescence Spectrometric Procedures

A cooperative investigation has been performed to test long-term interlaboratory and interinstrumental accuracy and precision of a dc carbon arc optical emission spectrographic method for determining the common trace and minor elements in silicate rocks and minerals. Comparisons are made with determinations by atomic absorption and X-ray fluorescence spectrometric procedures to indicate agreement or bias of the analytical results, and the presence of systematic errors.