Grain size effect in non-dispersive X-ray fluorescence analysis

Lubecki, A.; Hołyńska, B.; Wasilewska, M.

doi:10.1016/0584-8547(68)80025-4

Cited by 37 publications

(9 citation statements)

References 2 publications

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“…However, since our samples are thick mixtures of two powders, surface roughness related to nite grain sizes 12,[47][48][49] and possible non-homogeneity of actual samples could contribute to the result. By modelling the PIXE yields from spherical particles Jex et al 50 reported reduced X-ray yields compared to those of at thin samples.…”

Section: Resultsmentioning

confidence: 99%

Influence of chemical environment on the analysis of X-ray spectra of thick pellet samples containing 3d transition metal compounds

Fazinić

Mihalić

Mandić

2013

J. Anal. At. Spectrom.

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Nowadays quantitative analysis in energy dispersive X-ray Emission Spectroscopy is usually performed by the "fundamental parameter approach". Such an approach generally relies upon a good knowledge of fundamental physical parameters. As a rule none of the algorithms in use by laboratories performing routine analysis account for possible chemical effects on X-ray intensity ratios or energies. Here we tested the possible influence of such practice on reliability in the routine analysis of thick pellet samples containing transition metal compounds. A number of samples were prepared by mixing various proportions of MnO 2 , KMnO 4 , and Co 3 O 4 (sets A-B) or Cr 2 O 3 , K 2 Cr 2 O 7 , and Fe 2 O 3 (C-D). The samples were irradiated by 2 MeV proton beams and proton induced X-ray emission spectra were analyzed by a "fundamental parameter" approach using the GUPIXWIN code. The main interest has been to test the possibility of false Fe detection in the presence of large Mn and Co peaks (sets A-B) and/or Mn in the presence of large Cr and Fe peaks (sets C-D). The results of the analyses indicate false hits of Fe (sets A-B), and larger reported Mn concentrations than expected (sets C-D). However, in all the cases the reported concentrations for Fe or Mn are in between the limits of detection and quantitation. The influence of surface roughness and other effects have been discussed.

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Section: Resultsmentioning

confidence: 99%

Influence of chemical environment on the analysis of X-ray spectra of thick pellet samples containing 3d transition metal compounds

Fazinić

Mihalić

Mandić

2013

J. Anal. At. Spectrom.

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“…Peat is a mixture of mineral particles and organic matter. The mixture is heterogeneous for X‐ray absorption and fluorescence due to the distribution of elements in minerals with different contents (mineralogical effect) and the different particle size of minerals 14–23 . XRF analysis of powder peat samples is problematic due to variations in the mineral composition, high organic matter content (up to 90 wt%), particle size distribution, as well as the lack of matrix‐matched reference materials with a certified content of the rock‐forming elements.…”

Section: Introductionmentioning

confidence: 99%

Features of X‐ray fluorescence determination of rock‐forming elements in powder samples of peat sediments

2021

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The features of rock‐forming elements determination in powder samples of peat sediments are considered. Based on theoretical calculations and experimental data, the mineralogical and particle size effects on the X‐ray fluorescence intensity have been estimated. For routine analysis, powder rock samples are usually milled to a particle size of 10–60 μm. Theoretically, estimated variations of rock‐forming elements analytical lines intensities in different minerals are up to 30%, and the particle size effect cannot be eliminated simultaneously for all rock‐forming elements. Experimental estimation shows that the impossibility of the particle size distribution control can lead to significant variations in the intensities of the analytical lines (3%–18%) that is mainly corresponding to theoretical estimation. Fine milling allowed us to achieve an average particle size of fewer than 20 μm and reduce the measurement uncertainty by 1.5–2 times. 12 samples of peat sediments with organic matter content up to 70 wt% were analyzed by X‐ray fluorescence analysis using different sample preparation techniques, as well as by certified methods. The accuracy of X‐ray fluorescence analysis of peat sediments prepared as pressed pellets varies from 1.5 to 11 rel% depending on compound contents. It is more than for samples prepared as fused beads, however, the proposed method can be used to determine the variations of rock‐forming elements contents in peat sediments where the content variations exceed the measurement uncertainty, and accuracy of analysis is sufficient for further paleoecological reconstructions.

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“…19 As a consequence of these parameters, in unfavorable cases the intensity variation can exceed 50%. 20 Lubecki et al 21 published experimental results of measurements of sand samples containing grains of Fe 3 O 4 , excited by sources of various energy. With increase in grain size from 25 to 200 µm, the Fe K fluorescence intensity decreases by about 64% at an excitation energy of about 9.2 keV.…”

Section: Introductionmentioning

confidence: 99%

Influence of particle size on XRF wear analysis in plastics processing

et al. 2005

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Wear has to be quantified by the analytical characterization of particles in a plastic film generated by an extruder. The influence of particle size, film (matrix) thickness and particle location on the intensity of the Fe Ka peak, the Fe Kb/Ka intensity ratios and the Compton scattering peak intensity are discussed. Experimental results are given for two synthetic matrices, vaseline and transparent tape. A comparison of the measured results with those of a simulation is made.

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Grain size effect in non-dispersive X-ray fluorescence analysis

Cited by 37 publications

References 2 publications

Influence of chemical environment on the analysis of X-ray spectra of thick pellet samples containing 3d transition metal compounds

Influence of chemical environment on the analysis of X-ray spectra of thick pellet samples containing 3d transition metal compounds

Features of X‐ray fluorescence determination of rock‐forming elements in powder samples of peat sediments

Influence of particle size on XRF wear analysis in plastics processing

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