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Applications of X-Ray Analysis to Environmental and Biomedical Studies

Published online by Cambridge University Press:  06 March 2019

John V. Gilfrich
John V. Gilfrich*
Affiliation:
Naval Research Laboratory, Washington, D. C. 20390
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Abstract

Recent developments in x-ray spectroscopy have shown that this technique is a very powerful tool for the analysis of small quantities of material. A distinction must be made here between microanalysis -the analysis for elemental composition of a small total amount of material - and trace analysis - the analysis of bulk material for the presence of certain elements at very low concentrations. By the use of chemical separation, a problem in trace analysis can be converted into a microanalytical situation. A major improvement in trace analysis has been achieved by the use of ion-exchange resin loaded onto filter paper to collect the element(s) of interest from a solution of the original sample. The analysis of these concentrates or of particulate matter filtered out of polluted air or water can be optimized because the total mass of the sample is small and the background due to scattered prirmary radiation can be minimized.

Much interest has become manifest recently in the use of solid-state detectors for energy dispersion x-ray analysis of samples of this type. The value of energy dispersion can be demonstrated by improved detection limits for samples containing only a few widely separated elements. However, resolution of state-of-the-art solid-state detectors is not adequate to separate the Kβ of one element from the Kα of the next higher atomic number among the transition metals. Thus the presence of a large number of immediate neighbor elements at widely different concentrations as in pollution samples suggests the need for crystal spectrometers.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 16: 'Twenty-First Annual Conference on Applications of X-ray Analysis, August 2-4, 1972 , 1972 , pp. 1 - 9
Copyright
Copyright © International Centre for Diffraction Data 1972

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References

1. Goulding, F. S. and Jaklevic, J. M., “Trace Element Analysis by X-Ray Fluorescence,” Lawrence Berkeley Laboratory, UCRL-20625, May 1971.Google Scholar
2. Bowman, H. R., Conway, J. G. and Asaro, F., “Atmospheric Lead and Bromine Concentration in Berkeley, California (1963-70),” Envir. Sci. & Tech. 6, 558–60 (1972).Google Scholar
3. Dittrich, T. R. and Cothern, C. R., “Analysis of Trace Metal Particulates in Atmospheric Samples using X-Ray Fluorescence,” Jour. Air Poll. Cont. Asaoc. 21, 716–19 (1971).Google Scholar
4. Leroux, J. and Mahmud, M., “Flexibility of X-Ray Emission Spectrography as Adapted to Microanalysis of Air Pollutants,” Jour. Air Poll. Cont. Assoc. 20, 402–04 (1970).Google Scholar
5. Johansson, T. B., Akelsson, R. and Johansson, S. A. E., “Proton-Induced X-Ray Emission Spectroscopy in Elemental Trace Analysis,” Lund Institute of Technology, LUNP 7109, August 1971.Google Scholar
6. Luke, C. L., “Determination of Trace Elements in Inorganic and Organic Materials by X-Ray Fluorescence Spectroscopy,” Anal. Chim. Acta 41, 237 (1968).Google Scholar
7. Campbell, W. J., Spano, E. F. and Green, T. E., “Micro and Trace Analysis by a Combination of Ion Exchange Resin-Loaded Papers and X-Ray Spectrography,” Anal. Chem. 38, 987–96 (1966).Google Scholar
8. Campbell, W. J., Green, T. E. and Law, S. L., “Ion Exchange Papers in X-Ray Spectroscopy,” American Laboratory, June 1970.Google Scholar
9. Green, T. E., Law, S. L. and Campbell, W. J., “Use of Selective Ion Exchange Paper in X-Ray Spectrography and Neutron Activation,” Anal. Chem. 42, 1949–53(1970).Google Scholar
10. Law, S. L., “Methyl Mercury and Inorganic Mercury Collection by a Selective Chelating Resin,” Science 174, 285–7 (1971).Google Scholar
11. Bearden, J. A., “X-Ray Wavelengths,” U. S. Atomic Energy Comm., NYO-10586, 1964.Google Scholar