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Limits of detectability for trace elements in metal, powder, and solution samples range from 0.1 to 100 ppm depending on the element being determined, sample composition, and the complexity of the X-ray spectra. The limits of detectability range from 0.01 to 10 μg for elements that have been preconcentrated chemically in a form suitable for X-ray spectrographic determination.
Campbell, William J.
Supervisory Research Chemist, U.S. Department of the Interior, College Park, Md.