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• W2182939034 abstract "Introduction X-ray fluorescence spectrometry (XRF) has generally been the method of choice for the last few decades for the analysis of geologic samples, particularly for major element analyses of silicate rocks. It offers high precision (typically less than 1 % relative standard deviation (RSD) for the major elements) with minimal sample preparation and analysis times. A given rock can be crushed, fused or pressed, and analyzed on an ''as received basis within two hours if need be. The same sample preparation can also provide information on some ten to twenty trace elements with detection limits normally well below 100 ppm if the XRF analysis time is increased from the 15 minutes it takes for major elements to one to two hours per sample. An introduction with the basic steps involved in setting up the Rigaku model 3070 for a silicate rock analysis has already been published in this journal [1]. However, the high precision in a very reasonable analysis time does not translate into an equivalent degree of accuracy, a fact which is difficult to transmit to the customer who always sees analyses totaling to 100.00 ± 0.10% in the literature. Although it is possible to obtain accuracies in the tenths of a percent, a much more time consuming process is required than was usually employed, and currently no miracle cures exist. Even if only basaltic rocks are to be analyzed, geological analysis labs, the samples are rarely routine because standards that have essentially equivalent compositions even to the trace components do not exist. Even if only basaltic rocks are to be analyzed, the variability between samples is too great to expect the major components to always be within a few tenths of the true or even the accepted values. Just how bad is the accuracy for routine analyses? How much precision and accuracy should be expected for how much effort? What can be done to obtain the best answers, if those are really needed for the problem at hand? These are important questions which must be addressed when protocols are being written or when consumers of the information being generated aren't thinking in terms of cost/benefit curves. These are also the questions we would like to address here, using geological analyses as our primary focus, although the answers are also important to other sample types such as powdered biological materials (which we also do in our laboratory)." @default.
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• W2182939034 date "1990-01-01" @default.
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• W2182939034 title "MINIMIZING THE SOURCES OF ERROR IN THE ANALYSIS OF GEOLOGICAL SAMPLES BY X-RAY FLUORESCENCE" @default.
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