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Development of a Calibration Method for Quantitative X-ray Powder Diffraction of Size-Segregated Aerosols

Published online by Cambridge University Press:  06 March 2019

Robert D. Giauque ,
Joseph M. Jaklevic  and
Linda E. Sindelar
Robert D. Giauque
Affiliation:
Lawrence Berkeley Laboratory University of California Berkeley, CA 94720
Joseph M. Jaklevic
Affiliation:
Lawrence Berkeley Laboratory University of California Berkeley, CA 94720
Linda E. Sindelar
Affiliation:
Lawrence Berkeley Laboratory University of California Berkeley, CA 94720
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Extract

X-ray powder diffraction (XPD) is an important tool for the chemical characterization of atmospheric aerosol samples particularly when combined with elemental analysis obtained from X-ray fluorescence (XRF) measurements of the same specimen. Aerosol samples obtained in typical monitoring studies consist of thin, uniform deposits of particles corresponding to a known size distribution with aerodynamic equivalent diameters of less than 10 microns.This is an ideal form for X-ray fluorescence analysis since absorption and matrix enhancement effects are minimized. However, the ability to perform quantitative X-ray powder diffraction without the use of internal standards is restricted by several factors which affect the linearity of response between diffracted intensity and sample concentration. In addition to the normal photoelectric absorption due to passage of the X-rays through the sample, XPD intensities can be affected by primary and secondary extinction due to diffraction of the incident beam, particle size effects and preferred orientation of particles.

Type
VIII. Qualitative and Quantiative Phase Analysis by XRD
Information
Advances in X-Ray Analysis , Volume 34: Thirty-Ninth Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1990 , 1990 , pp. 395 - 407
Copyright
Copyright © International Centre for Diffraction Data 1990

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References

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