<i>The U. S. Geological Survey</i> has been interested for some time in how rocks became contaminated by trace elements during grinding before analysis. Elimination of contamination is especially important in emission and x-ray spectrochemical analysis.
A. T. Myers and W. H. Wood, "Ceramic Mills in a Paint Mixer for Preparation of Multiple Rock Samples," Appl. Spectrosc. 14, 136-138 (1960)
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