X-ray spectrometry

Markowicz, A.; Grieken, R.E. Van

doi:10.1021/ac00269a019

Cited by 7 publications

(8 citation statements)

References 96 publications

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“…12 It also avoids validation studies between different techniques in order to assure the quality of TXRF results. A work has indicated very close agreement between vendor-certified values on TXRF reference calibration standards and the results from an ion beam technique heavy ion backscattering spectrometry (HIBS) 13 which does not require standards for accurate analysis.…”

Section: Resultsmentioning

confidence: 99%

A Procedure for the Improvement in the Determination of a TXRF Spectrometer Sensitivity Curve

Bennun

Sanhueza

2010

Anal. Sci.

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Section: Resultsmentioning

confidence: 99%

A Procedure for the Improvement in the Determination of a TXRF Spectrometer Sensitivity Curve

Bennun

Sanhueza

2010

Anal. Sci.

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“…Since the interaction of individual X-ray photons of a specific energy with individual atoms of specific atomic numbers can be very well-described theoretically, in principle any X-ray-based analytical method has the potential to be used for quantitative analysis [24].…”

Section: Quantitative Aspects Of X-ray Analysesmentioning

confidence: 99%

Recent advances in analysis of trace elements in environmental samples by X-ray based techniques (IUPAC Technical Report)

Terzano

Denecke

Falkenberg

et al. 2019

Pure and Applied Chemistry

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Trace elements analysis is a fundamental challenge in environmental sciences. Scientists measure trace elements in environmental media in order to assess the quality and safety of ecosystems and to quantify the burden of anthropogenic pollution. Among the available analytical techniques, X-ray based methods are particularly powerful, as they can quantify trace elements in situ. Chemical extraction is not required, as is the case for many other analytical techniques. In the last few years, the potential for X-ray techniques to be applied in the environmental sciences has dramatically increased due to developments in laboratory instruments and synchrotron radiation facilities with improved sensitivity and spatial resolution. In this report, we summarize the principles of the X-ray based analytical techniques most frequently employed to study trace elements in environmental samples. We report on the most recent developments in laboratory and synchrotron techniques, as well as advances in instrumentation, with a special attention on X-ray sources, detectors, and optics. Lastly, we inform readers on recent applications of X-ray based analysis to different environmental matrices, such as soil, sediments, waters, wastes, living organisms, geological samples, and atmospheric particulate, and we report examples of sample preparation.

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“…Theoretical calculations predict a difference in energy between these transitions of 3.6 eV (Deslattes et al, 2003), which will result in a broadening of the Ti K diffraction arc of $0.5 for the conditions described in Table 1, a relatively minor contribution to the observed widths. The In L series of emission lines has a theoretical L 2 M 5 line at 3494.8 eV; however, this transition violates the quantum number selection rules for electric dipole and quadrupole transitions and magnetic dipole transitions (Markowicz, 2002), so is expected to be extremely weak.…”

Section: Figurementioning

confidence: 99%

Phase-targeted X-ray diffraction

Hansford

2016

J Appl Cryst

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A powder X-ray diffraction (XRD) method to enhance the signal of a specific crystalline phase within a mixture is presented for the first time. Specificity to the targeted phase relies on finding coincidences in the ratios of crystal d spacings and the ratios of elemental characteristic X-ray energies. Such coincidences can be exploited so that the two crystal planes diffract through the same scattering angle at two different X-ray energies. An energy-resolving detector placed at the appropriate scattering angle will detect a significantly enhanced signal at these energies if the target mineral or phase is present in the sample. When implemented using high scattering angles, for example 2 > 150 , the method is tolerant to sample morphology and distance on the scale of $2 mm. The principle of the method is demonstrated experimentally using Pd L 1 and Pd L 1 emission lines to enhance the diffraction signal of quartz. Both a pure quartz powder pellet and an unprepared mudstone rock specimen are used to test and develop the phase-targeted method. The technique is further demonstrated in the sensitive detection of retained austenite in steel samples using a combination of In L 1 and Ti K emission lines. For both these examples it is also shown how the use of an attenuating foil, with an absorption edge close to and above the higher-energy characteristic X-ray line, can serve to isolate to some degree the coincidence signals from other fluorescence and diffraction peaks in the detected spectrum. The phase-targeted XRD technique is suitable for implementation using low-cost off-the-shelf components in a handheld or inline instrument format.

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X-ray spectrometry

Cited by 7 publications

References 96 publications

A Procedure for the Improvement in the Determination of a TXRF Spectrometer Sensitivity Curve

A Procedure for the Improvement in the Determination of a TXRF Spectrometer Sensitivity Curve

Recent advances in analysis of trace elements in environmental samples by X-ray based techniques (IUPAC Technical Report)

Phase-targeted X-ray diffraction

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