Standardless Quantification of Heavy Elements by Electron Probe Microanalysis

Moy, Aurélien; Merlet, Claude; Dugne, O.

doi:10.1021/acs.analchem.5b01443

Cited by 14 publications

(16 citation statements)

References 42 publications

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“…Li et al (2014) and Zhao et al (2015) carried out their own X-ray yield measurements and showed that their experimental data compared favorably, to within ~10%, with the predictions of PENELOPE. More recently, Moy et al (2015) performed new absolute X-ray yield measurements for several high- Z element materials, which were found to agree satisfactorily with the predictions of PENEPMA. This allowed the development of a standardless method of analysis for samples containing actinide elements, for which reference standards are difficult to find.…”

Section: Examples Of Applications Of Penepmamentioning

confidence: 63%

PENEPMA: A Monte Carlo Program for the Simulation of X-Ray Emission in Electron Probe Microanalysis

Llovet

Salvat

2017

Microsc Microanal

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The Monte Carlo program PENEPMA performs simulations of X-ray emission from samples bombarded with both electron and photon beams. It is based on the general-purpose Monte Carlo simulation package PENELOPE, an elaborate system for the simulation of coupled electron-photon transport in arbitrary materials, and on the geometry subroutine package PENGEOM, which tracks particles through complex material structures defined by quadric surfaces. After a brief description of the interaction models implemented in the simulation subroutines and of the structure and operation of PENEPMA, we provide an overview of the capabilities of the program along with several examples of its application to the modeling of electron probe microanalysis measurements.

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Section: Examples Of Applications Of Penepmamentioning

confidence: 63%

PENEPMA: A Monte Carlo Program for the Simulation of X-Ray Emission in Electron Probe Microanalysis

Llovet

Salvat

2017

Microsc Microanal

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“…The direct analysis of the light elements was performed taking into account the flatness and cleanness of the specimens, and also the processor characteristic (digital pulse). The ZAF correction factors were used for element quantification . The acronym ‘ZAF’ describes a procedure in which corrections for atomic number effects (Z), absorption (A), and fluorescence (F) are calculated separately from suitable physical models.…”

Section: Methodsmentioning

confidence: 99%

Effect of Denture Cleansers on Cobalt‐Chromium Alloy Surface: A Simulated Period of 5 Years’ Use

Curylofo

Raile

Vasconcellos

et al. 2018

Journal of Prosthodontics

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Purpose To compare the effect of solutions of effervescent tablets (ET), cetylpyridinium chloride (CPC), and experimental solutions of Ricinus communis on the surface of cobalt‐chromium (Co‐Cr) alloys. Materials and Methods Fifty‐five specimens of Co‐Cr were prepared by the lost‐wax casting method using circular patterns (∅12 × 3 mm). The specimens were randomly divided into 5 groups: deionized water (control); 2% R. communis; 10% R. communis; ET, and CPC. The surface roughness of specimens (n = 10) was evaluated before immersion (baseline), and at simulated times of ½, 1, 2, 3, 4, and 5 years, by laser confocal microscope (Sa, μm) and profilometer (Ra, μm). The surface topography and chemical composition (n = 1) was qualitatively analyzed with scanning electron microscopy (SEM), and energy dispersive X‐ray spectrometry (EDS). Data were subjected to Kruskal–Wallis followed by Dunn tests, and Friedman followed by Wilcoxon tests (α = 0.05). Results For Sa, there was no difference for the solution factor. For the time factor a significant difference was found with 2% R. communis solution among baseline and ½, 2, 3, and 5 years (p < 0.001) and with 10% R. communis solution between 1 and 2 years (p = 0.007), with decreasing roughness over time. For Ra, cetylpyridinium chloride exhibited less roughness than 10% R. communis solution in ½ (p = 0.048) and 5 years (p = 0.013). In the SEM and EDS analysis the solutions did not present deleterious effects or changes in the chemical composition on the surfaces. Conclusions Although a significant difference was found for the roughness, the results, below 0.2 μm, are clinically acceptable. Thus, all solutions can be used safely in removable partial denture cleaning for a period of 5 years.

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“…Briefly, the resin sections attached to glass slides were coated with carbon and analyzed in the Hitachi S-4700 scanning electron microscope equipped with the energy dispersive spectrometry (EDS) analytical system (liquid-nitrogen cooled lithium drifted silicon (Si(Li)) x-ray detector and the Thermo Scientific NSS spectral imaging system). The standardless method was used for quantification of the elemental composition (for details see Trincavelli et al 2014 ; Moy et al 2015 ). For the control, analyses were performed on the tissue-free resin fragments of the same section.…”

Section: Methodsmentioning

confidence: 99%

Excretion in the mother’s body: modifications of the larval excretory system in the viviparous dermapteran, Arixenia esau

2018

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The vast majority of Dermaptera are free-living and oviparous, i.e., females lay eggs within which embryonic development occurs until the larva hatches. In contrast, in the epizoic dermapteran Arixenia esau, eggs are retained within mother’s body and the embryos and first instar larvae develop inside her reproductive system. Such a reproductive strategy poses many physiological challenges for a mother, one of which is the removal of metabolic waste generated by the developing offspring. Here, we examine how the Arixenia females cope with this challenge by analyzing features of the developing larval excretory system. Our comparative analyses of the early and late first instar larvae revealed characteristic modifications in the cellular architecture of the Malpighian tubules, indicating that these organs are functional. The results of the electron probe microanalyses suggest additionally that the larval Malpighian tubules are mainly involved in maintaining ion homeostasis. We also found that the lumen of the larval alimentary track is occluded by a cellular diaphragm at the midgut-hindgut junction and that cells of the diaphragm accumulate metabolic compounds. Such an organization of the larval gut apparently prevents fouling of the mother’s organism with the offspring metabolic waste and therefore can be regarded as an adaptation for viviparity.

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Standardless Quantification of Heavy Elements by Electron Probe Microanalysis

Cited by 14 publications

References 42 publications

PENEPMA: A Monte Carlo Program for the Simulation of X-Ray Emission in Electron Probe Microanalysis

PENEPMA: A Monte Carlo Program for the Simulation of X-Ray Emission in Electron Probe Microanalysis

Effect of Denture Cleansers on Cobalt‐Chromium Alloy Surface: A Simulated Period of 5 Years’ Use

Excretion in the mother’s body: modifications of the larval excretory system in the viviparous dermapteran, Arixenia esau

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