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

Bennun, Leonardo; Sanhueza, Vilma

doi:10.2116/analsci.26.331

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…This sensitivity is different for each element and mainly depends on the fundamental parameters (σ i and ω i ) and the conditions of measurement (K i ) that generally can be supposed as constant. Generally, this curve is obtained measuring certificated multielement samples and in recent works, measuring this answer when analyzing the relative intensities of known stoichiometry compounds 29 In summary, the conversion of the intensity measured I i into the unknown concentration C i of the element i is obtained from Eq. (2), as:…”

Section: Fig 1: Structure Of the Cianocobalamine Moleculementioning

confidence: 99%

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2018

IJPSR

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This manuscript presents the application of a detailed set of analytical technologies to the content of assorted micronutrient supplement and mineral supplement products on the market in the city of Concepcion, Chile. We applied TXRF as a screening technique for the evaluation of 1) The vitamin B-12 content in multivitamins and 2) the elemental composition (P, K, Ca, Mn, Cr, Fe, Cu and Zn) in mineral supplements. The analyzed 16 products (10 sold as pills, 3 as syrups, and 3 as solutions for intramuscular injections), were acquired directly from drugstores without medical prescription. They were processed in 3 different laboratories in order to avoid systematic errors. In the samples we evaluated: 1) The presence of the specified elements, 2) The correlation between the labelled contents and our evaluations; and 3) The possible presence of harmful elements for human health. In this study few anomalies were found: 1) in some products there are significant differences between the concentrations labelled and our evaluations.2) The absence of cobalt in four of these vitamin B-12 containing products, 3) The presence of lead in a sample for intramuscular injection, 4) Arsenic was found in one of them, and 5) A trace detection of a rare earths element (possibly Ytterbium) in a particular product. The products studied are imported from different countries and they are labelled in their country of origin, so the questions about the safety and efficacy aspects of them could affect not only to Chilean consumers.

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Section: Fig 1: Structure Of the Cianocobalamine Moleculementioning

confidence: 99%

“…Galium was added as internal standard in these solutions with a constant concentration of 5 μg/mL. The TXRF spectra of these standards were measured for 500 s and the relative sensitivities with respect to Ga were determined, as is described in our previous studies 29,30 .…”

Section: Fig 1: Structure Of the Cianocobalamine Moleculementioning

confidence: 99%

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2018

IJPSR

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“…The amount of low- Z elements was determined by the addition of the Sc internal standard. Bennun and Sanhueza reported that chemical compounds of stoichiometric compositions and high purity, including at least two elements such as K and Mn in KMnO 4 , could be used for alternative materials of certified standard materials in quantitative TXRF analysis.…”

Section: Total Reflection X-ray Fluorescence Analysismentioning

confidence: 99%

X-ray Spectrometry

et al. 2011

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I n this Review, we focus on the most significant and essential progress in X-ray spectrometry (XRS) published during the period from January 2010 to August 2011 covering developments and improvements in X-ray optics, X-ray detectors, new quantification models in X-ray spectra and data evaluation, micro-X-ray fluorescence (micro-XRF) including 3D X-ray fluorescence (3D-XRF), elemental imaging techniques, electron probe microanalysis (EPMA), total reflection X-ray fluorescence (TXRF), particle-induced X-ray emission (PIXE) analysis, and X-ray absorption spectrometry (XAS). Herein, we focus on X-ray spectrometry, and thus, X-ray radiography used for only investigating inside structure images and X-ray diffraction (XRD) is not covered. However, we will introduce articles including combinations of these X-ray imaging techniques and other spectroscopic techniques. In addition, different applications in each subfield of XRS, including sample preparation, standard materials, energy-dispersive XRF (ED-XRF), and wavelength-dispersive XRF (WD-XRF), are described. We attempt to look over the current trends in this analytical field by critically citing selected papers to support the research activity of the community of X-ray scientists.Since the previous review on XRS in Analytical Chemistry, an international group of scientists published two overviews on XRS 1,2 in the Journal of Analytical Atomic Spectrometry covering the main fields of XRS analytical spectroscopic methods and instruments. These review articles involve all of the important sections of XRS in nine chapters: reviews, instrumentation, spectrum analysis, matrix correction and calibration, X-ray optics and micro fluorescence, synchrotron radiation (SR), TXRF, portable and mobile X-ray fluorescence (XRF), and online XRF and applications. The section on applications is categorized into geological and industrial minerals, environmental, archeological, cultural heritage, forensic science, etc. These review articles are useful, especially for an overall look at recent XRS research activities.The second edition of the book, "Elements of Modern X-ray Physics", was published. 3 It provides excellent explanations of the basics of X-ray physics, interactions with matter, X-ray sources,

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“…Evaluating the trace metal composition and the metals' effects in these media require sensitive techniques that can quantify the typically low concentration levels of metals in these media, over a wide range of particle sizes. Studies have shown that although ICP-MS (inductively coupled plasma mass spectrometry), ICP-OES (inductively coupled plasma optical emission spectroscopy), and AAS (atomic absorption spectroscopy) are sensitive techniques, most often a larger amount of sample substance is necessary for adequate sample preparation and handling (Bennun and Sanhueza, 2010). This makes the application of alternative techniques such as total reflection X-ray fluorescence spectrometry (TXRF) attractive in the analysis of particulate matter with very little mass, (typically in the microgram range) in comparison to the other techniques (Bulska and Ruszczyńska, 2017).…”

Section: Introductionmentioning

confidence: 99%

Application of TXRF in monitoring trace metals in particulate matter and cloud water

Fomba¹,

Deabji²,

Barcha³

et al. 2020

Atmos. Meas. Tech.

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Abstract. Trace metals in ambient particulate matter and cloud are considered key elements of atmospheric processes as they affect air quality, environmental ecosystems, and cloud formation. However, they are often available at trace concentrations in these media such that their analysis requires high-precision and sensitive techniques. In this study, different analytical methods were applied to quantify trace metals in particulate matter (PM) samples collected on quartz and polycarbonate filters as well as cloud water, using the Total reflection X-Ray Fluorescence (TXRF) technique. These methods considered the measurement of filter samples directly without and with chemical pretreatment. Direct measurements involved the analysis of PM samples collected on polycarbonate filters and cloud water samples after they are brought onto TXRF carrier substrates. The chemical treatment method involved the assessment of different acid digestion procedures on PM sampled on quartz filters. The solutions applied were reverse aqua regia, nitric acid, and a combination of nitric acid and hydrogen peroxide. The effect of cold-plasma treatment of samples on polycarbonate filters before TXRF measurements was also investigated. Digestion with the reverse aqua regia solution provided lower blanks and higher recovery in comparison to other tested procedures. The detection limits of the elements ranged from 0.3 to 44 ng cm−2. Ca, K, Zn, and Fe showed the highest detection limits of 44, 35, 6, and 1 ng cm−2, while As and Se had the lowest of 0.3 and 0.8 ng cm−2, respectively. The method showed higher recovery for most trace metals when applied to commercially available reference materials and field samples. TXRF measurements showed good agreement with results obtained from ion chromatography measurements for elements such as Ca and K. Cold-plasma treatment did not significantly lead to an increase in the detected concentration, and the results were element specific. Baking of the quartz filters prior to sampling showed a reduction of more than 20 % of the filter blanks for elements such as V, Sr, Mn, Zn, and Sb. The methods were applied successfully on ambient particulate matter and cloud water samples collected from the Atlas Mohammed V station in Morocco and the Cape Verde Atmospheric Observatory. The obtained concentrations were within the range reported using different techniques from similar remote and background regions elsewhere, especially for elements of anthropogenic origins such as V, Pb, and Zn with concentrations of up to 10, 19, and 28 ng m−3, respectively. Enrichment factor analysis indicated that crustal matter dominated the abundance of most of the elements, while anthropogenic activities also contributed to the abundance of elements such as Sb, Se, and Pb. The results confirm that TXRF is a useful complementary sensitive technique for trace metal analysis of particulate matter in the microgram range as well as in cloud water droplets.

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

Cited by 13 publications

References 14 publications

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X-ray Spectrometry

Application of TXRF in monitoring trace metals in particulate matter and cloud water

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