ISSN:
0049-8246
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Synthetic standards obtained by dry mixing of the components in appropriate proportions, when used as calibration standards in XRF analysis can be a major source of error in the analytical results, owing to the differences in the degree of their homogeneity compared with that of the sample. In an earlier study U3O8 was used as the matrix and Ca, Y, Gd and Th in the low concentration range (0-1500 ppm) as probe impurity elements. The study has now been extended to the low-Z matrix Al2O3 using the same impurity elements as probe elements and the same concentration range. This study also clearly illustrates the incompatibility of truely homogeneous standards with standards obtained by dry mixing and grinding and corroborates the results obtained in the earlier study. However, some of the general inferences drawn earlier required modification in order to explain the results for the two matrices. The effect of binding material, which is often required for briquetting the sample into pellet form and must be mixed with the sample by dry mixing, is discussed.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/xrs.1300180405
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