Boron Mass Fractions and δ 11 B Values of Eighteen International Geological Reference Materials

2021 ◽  
Author(s):  
Guanhong Zhu ◽  
Jinlong Ma ◽  
Gangjian Wei ◽  
Zhang Le
Keyword(s):  
Reference Materials ◽  
B Values ◽  
Mass Fractions ◽  
International Geological

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

2015 ◽  
Vol 40 (2) ◽  
pp. 217-226 ◽  
Author(s):  
Pei-Pei Zhao ◽  
Jie Li ◽  
Le Zhang ◽  
Zhi-Bing Wang ◽  
De-Xin Kong ◽  
...  
Keyword(s):  
Reference Materials ◽  
Isotopic Compositions ◽  
Mass Fractions ◽  
International Geological

New reference materials for trace-levels of actinide elements in plutonium

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Richard M. Essex ◽  
Lav Tandon ◽  
Amy Gaffney ◽  
Cole R. Hexel ◽  
Debbie A. Bostick ◽  
...  
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Quartz Glass ◽  
Uranium Isotope ◽  
Glass Bottle ◽  
Plutonium Isotopes ◽  
Mass Fractions ◽  
Trace Constituents ◽  
Actinide Elements

Abstract Two plutonium oxides were prepared as unique reference materials for measurement of actinide elements present as trace constituents. Each reference material unit is approximately 200 mg of PuO2 powder in a quartz glass bottle. Characterized attributes of the oxides included mass fractions of plutonium, americium, neptunium, and uranium. Isotope-amount ratios were also determined for plutonium and uranium, but neptunium and americium were observed to be monoisotopic 237Np and 241Am. Measurements for characterization and verification of the attributes show that plutonium and trace actinides are homogeneous with the exception of limited heterogeneity for uranium, primarily observed for the 238U isotope. Model purification ages calculated from measured americium and uranium attribute values are consistent with material histories and indicate that these impurities are predominantly due to the decay of plutonium isotopes.

scholarly journals Revalidation and Long-Term Stability of National Institute of Standards and Technology Standard Reference Materials 1566, 1567, 1568, and 1570

2000 ◽  
Vol 83 (5) ◽  
pp. 1121-1134 ◽  
Author(s):  
David L Anderson ◽  
William C Cunningham
Keyword(s):  
Activation Analysis ◽  
Reference Materials ◽  
Rice Flour ◽  
Standard Reference Materials ◽  
National Bureau ◽  
Oyster Tissue ◽  
Long Term Stability ◽  
Technology Standard ◽  
Mass Fractions

Abstract Multiple units of Standard Reference Materials (SRMs) 1566 Oyster Tissue, 1567 Wheat Flour, 1568 Rice Flour, and 1570 Trace Elements in Spinach, produced by the National Institute of Standards and Technology (NIST, then the National Bureau of Standards), were analyzed 17–20 years after the original certification dates and 12–15 years after the certificates became invalid. Instrumental neutron activation analysis and thermal neutron prompt (γ-ray activation analysis were used to measure mass fractions for 27 elements in these SRMs to revalidate them for use in quality assurance (QA) programs required for food analysis programs within the U.S. Food and Drug Administration. With the exception of Se in SRM 1567, all element mass fractions were in agreement with certified values and literature data. Some evidence of B loss from SRM 1568 was observed. These materials were judged to be suitable for continued use in QA programs. Findings showed that these matrixes exhibited stability of moisture, mass fraction, and weight basis for far longer (≥15 years) than was indicated by the 5-year validity statement on the NIST Certificates of Analysis.

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.

Sign in / Sign up

Export Citation Format

Share Document