Trace Element Analysis of Geochemical Reference Samples by Energy Dispersive X-ray Fluorescence Spectrometry |
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Authors: | PC WEBB PJ POTTS JS WATSON |
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Institution: | Department of Earth Science, The Open University, Walton Hall, Milton Keynes, Bucks., MK7 6AA, UK. |
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Abstract: | A critical evaluation of trace element data derived by energy dispersive X-ray fluorescence (ED-XRF) analysis of over 40 geochemic reference samples shows that results for Rb, Sr, Y, Zr, Nb, and Th can be at least as good in terms of precision (better than ± 2 ppm (2s) or ± 3 % (2s relative), accuracy, and 3s detection limits (2 to 4 ppm) as those obtainable by other routine multi-element analytical techniques. Data obtained simultaneously for Ni, Cu, Zn, Ga, Pb and U are less precise because excitation conditions are less well optimised (with 3s detection limits of 6 to 12 ppm). The quality of data and the efficiency of simultaneous analysis of both sets of elements is well-suited to most geological applications. Following a critical appraisal of calibration accuracy, new trace element data are presented for 15 reference samples from the Geological Survey of Japan. |
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