scholarly journals Determination of Bromine in Regulated Foods with a Field-Portable X-Ray Fluorescence Analyzer

2009 ◽  
Vol 92 (2) ◽  
pp. 502-510 ◽  
Author(s):  
David L Anderson
Keyword(s):  
Reference Materials ◽  
Soil Analysis ◽  
Bakery Products ◽  
X Ray ◽  
Mass Fractions ◽  
Z Scores ◽  
Quantitative Results ◽  
Accuracy Of Results ◽  
Fluorescence Analyzer

Abstract A field-portable X-ray fluorescence analyzer, factory-calibrated for soil analysis, was used to measure bromine (Br) mass fractions in reference materials, flour, bakery products, malted barley, selected U.S. Food and Drug Administration Total Diet Study foods, and other food products. By using a calibration based on instrumental neutron activation analysis results for Br in reference materials, accurate quantitative results, confirmed by z-scores, could be obtained for mass fractions of about 255 mg/kg. These results confirmed accuracy of results (with larger uncertainties) obtained by applying a simple correction factor to the analyzer's output value. Results showed that very short analysis times (<2 min) would be needed to screen foods for Br content at regulatory levels for brominated and enriched brominated flour (24 mg/kg Br) and whole wheat flour and bakery products (36 mg/kg Br). Feasibility for determination of Br in malted barley at the regulatory level (75 mg/kg Br) was demonstrated, but quantitative results at that level could not be assured because no reference material with a suitable mass fraction was available. Br mass fractions for all foods tested were well below regulatory levels.

scholarly journals Analysis of Beverages for Hg, As, Pb, and Cd with a Field Portable X-Ray Fluorescence Analyzer

2010 ◽  
Vol 93 (2) ◽  
pp. 683-693 ◽  
Author(s):  
David L Anderson
Keyword(s):  
Correction Factors ◽  
Correction Algorithm ◽  
X Ray ◽  
Ray Cells ◽  
Mass Fractions ◽  
Z Scores ◽  
Quantitative Results ◽  
Tube Type ◽  
Measurement Uncertainties ◽  
Fluorescence Analyzer

Abstract Analytical capabilities of a handheld X-ray tube analyzer for analysis of beverages were evaluated. Sets of standard solutions for the elements Hg, As, Pb, and Cd were prepared with mass fractions up to 5000 mg/kg. A thirst quencher beverage was spiked with these elements up to mass fractions of 2500 mg/kg. Portions of these solutions were placed in standard X-ray fluorescence (XRF) cells, as well as the original container, and analyzed by using a field portable Innov-X -6000s XRF tube-type analyzer. Uncorrected analyzer output usually yielded qualitative or semiquantitative results for the spiked beverages in X-ray cells. Average correction factors applied to analyzer output yielded accurate (in terms of z-scores) quantitative results for As above 20 mg/kg and qualitative or semiquantitative results for the other elements. Weighted quadratic fit calibrations provided accurate quantitative or semiquantitative results for all elements at levels above 20 mg/kg. The instrument's preset X-ray overlap correction algorithm worked well for the beverage spiked with all four elements. Spiked beverages analyzed through the wall of the original polyethylene terephthalate container produced accurate results within measurement uncertainties after application of container wall correction factors.

scholarly journals Accuracy improvement in XRF analysis for the quantification of elements ranging from tenths to thousands μg g−1 in human tissues using different matrix reference materials

2020 ◽  
Vol 35 (12) ◽  
pp. 2920-2927
Author(s):  
Jorge Machado ◽  
Patrícia Miguel Carvalho ◽  
Ana Félix ◽  
Delfin Doutel ◽  
José Paulo Santos ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Reference Materials ◽  
Fluorescence Spectrometry ◽  
Human Tissues ◽  
Accuracy Improvement ◽  
External Calibration ◽  
X Ray ◽  
Xrf Analysis ◽  
Calibration Approach

In this work, we aim at achieving the most accurate quantitative determination of elements in human tissues by means of X-ray fluorescence spectrometry using the external calibration approach.

Calculation of the X-ray powder reflection profiles of very small needle-like crystals. II. Quantitative results on eskisehir sepiolite fibers

1981 ◽  
Vol 14 (6) ◽  
pp. 451-454 ◽  
Author(s):  
A. Yücel ◽  
M. Rautureau ◽  
D. Tchoubar ◽  
C. Tchoubar
Keyword(s):  
Water Content ◽  
Calculation Method ◽  
Lattice Parameters ◽  
Boundary Effects ◽  
Cross Sectional ◽  
X Ray ◽  
Hydration State ◽  
Quantitative Results ◽  
Small Needle

A calculation method for the X-ray profiles from small, needle-like crystallites [Yücel, Rautureau, Tchoubar & Tchoubar (1980). J. Appl. Cryst. 13, 370–374] is applied to natural Eskisehir sepiolite mineral. By analysing the hk0 reflections, quantitative results are given on the average cross-sectional dimensions, their distribution, preferred directions of growth, lattice parameters, hydration state, and imperfections. Practical methods for the determination of the zeolitic water content and the importance of boundary effects are proposed.

scholarly journals Development of Certified Reference Materials, Plastics (JSAC 0651-0655) for Determination of Bromine Using X-Ray Fluorescence Analysis

2008 ◽  
Vol 57 (6) ◽  
pp. 469-475 ◽  
Author(s):  
Kazuhiko Nakano ◽  
Toshihiro Nakamura ◽  
Izumi Nakai ◽  
Junji Noro ◽  
Akira Kawase ◽  
...  
Keyword(s):  
Reference Materials ◽  
Certified Reference Materials ◽  
Fluorescence Analysis ◽  
X Ray

scholarly journals Development of the Certified Reference Materials, Plastics (JSAC 0631, JSAC 0632) for Determination of Hazardous Metals by X-Ray Fluorescence Analysis

2007 ◽  
Vol 56 (5) ◽  
pp. 363-370 ◽  
Author(s):  
Kazuhiko NAKANO ◽  
Toshihiro NAKAMURA ◽  
Izumi NAKAI ◽  
Akira KAWASE ◽  
Makoto IMAI ◽  
...  
Keyword(s):  
Reference Materials ◽  
Certified Reference Materials ◽  
Fluorescence Analysis ◽  
X Ray ◽  
Hazardous Metals

Simultaneous Urography and Determination of Glomerular Filtration Rate

1994 ◽  
Vol 35 (4) ◽  
pp. 391-395 ◽  
Author(s):  
S. Lundqvist ◽  
S.-O. Hietala ◽  
C. Berglund ◽  
K. Karp
Keyword(s):  
Contrast Medium ◽  
Filtration Rate ◽  
Plasma Clearance ◽  
Patient Comfort ◽  
Total Plasma ◽  
Total Plasma Clearance ◽  
X Ray ◽  
Multiple Sample ◽  
Fluorescence Analyzer

The total plasma clearance of iohexol at urography and 51Cr-EDTA was compared in 31 patients with di- or tetraparesis. A reference 51Cr-EDTA clearance was also performed 24 hours prior to the urography. The GFR was calculated from one, 2 or 4 plasma samples collected 180, 210, 240 and 270 min after the injection. An X-ray fluorescence analyzer was used for the analysis of iohexol in plasma as well as the contrast medium clearance calculations. It was shown that single or multiple sample clearance of iohexol and 51Cr-EDTA were equivalent methods for measurement of the GFR. The GFR was not affected by iohexol in a dose routinely used for urography. It was concluded that the patient comfort is improved if 51Cr-EDTA clearance is replaced by contrast medium clearance in association with urography.

The Simultaneous Determination of Thorium, Niobium, Lead, and Zinc by Photon-Induced X-ray Fluorescence of Lateritic Material

1981 ◽  
Vol 35 (5) ◽  
pp. 502-505 ◽  
Author(s):  
J. J. Labrecque ◽  
D. Adames ◽  
W. C. Parker
Keyword(s):  
Atomic Absorption ◽  
Simultaneous Determination ◽  
Rapid Method ◽  
Reference Materials ◽  
Atomic Absorption Spectroscopy ◽  
Flame Atomic Absorption Spectroscopy ◽  
X Ray ◽  
Flame Atomic Absorption ◽  
Lead And Zinc

A rapid method is presented for the simultaneous determinations of thorium, niobium, lead, and zinc in lateritic material from Cerro Impacto, Estado Bolívar, Venezuela. This technique uses a PDP—11/05 processor—based photon induced x-ray fluorescence system. The total variations of approximately 5% for concentrations of approximately 1 and 10% for concentrations of approximately 0.1% were obtained with only 500 s of fluorescent time. The values obtained by this method were in agreement with values measured by conventional flame atomic absorption spectroscopy for lead and zinc. The values for thorium measured were in agreement with the reported values for the reference materials supplied by NBL.

A Method for the Routine Determination of Methylmercury in Marine Tissue by GC Isotope Dilution-ICP-MS

2012 ◽  
Vol 95 (4) ◽  
pp. 1189-1194 ◽  
Author(s):  
Stig Valdersnes ◽  
Amund Maage ◽  
Daniel Fliegel ◽  
Kåre Julshamn
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Isotope Dilution ◽  
Isotope Dilution Mass Spectrometry ◽  
Standard Reference Materials ◽  
Statistical Measures ◽  
Icp Ms ◽  
Wide Range ◽  
Z Scores

Abstract Currently, there is no legal limit for methyl mercury (MeHg) in food; thus, no standardized method for the determination of MeHg in seafood exists within the European jurisdiction. In anticipation of a future legislative limit an inductively coupled plasma isotope dilution mass spectrometry (GC-ICP-ID-MS) method was developed in collaboration with the European Standardization Organization (CEN). The method comprises spiking the tissue sample with Me201Hg, followed by decomposition with tetramethylammonium hydroxide, pH adjustment and derivatization with sodium tetraethylborate, and finally organic extraction of the derivatized MeHg in a hexane phase. Subsequently, the sample is analyzed via GC-ICP-MS and the result calculated using the ID equation. The working range of the method was 0.0005–1.321 mg/kg MeHg in marine tissue, with an internal reproducibility (RSD) of 12–1%. The method was validated based on statistical measures, such as the z-scores, using the commercially available reference materials from National Institute of Standards and Technology Standard Reference Material (NIST SRM) 1566b, NIST SRM 2977 and National Research Council of Canada (NRCC) TORT 2, NRCC, DORM 3, NRCC DOLT 4, and European Reference Material (ERM) CE 464. Z-scores for all standard reference materials, except for NIST SRM 1566b, were better than |1.5|. The wide range of marine tissues used during the validation ensures that the method will be applicable for measuring of MeHg in seafood matrixes of all kinds.

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