scholarly journals Hg isotopic composition and total Hg mass fraction in NIES Certified Reference Material No. 28 Urban Aerosols

2020 ◽  
Vol 412 (19) ◽  
pp. 4483-4493
Author(s):  
Akane Yamakawa ◽  
Sylvain Bérail ◽  
David Amouroux ◽  
Emmanuel Tessier ◽  
Julien Barre ◽  
...  
Keyword(s):  
Reference Material ◽  
Isotopic Composition ◽  
Certified Reference Material ◽  
Mass Fraction ◽  
Urban Aerosols ◽  
Total Hg

scholarly journals Sr Isotopic Composition of NIES Certified Reference Material No. 28 Urban Aerosols

2021 ◽  
Vol 2 ◽  
Author(s):  
Akane Yamakawa ◽  
Kimiyo Nagano ◽  
Miyuki Ukachi ◽  
Kaoru Onishi ◽  
Katsuyuki Yamashita ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Reference Material ◽  
Isotopic Composition ◽  
Certified Reference Material ◽  
Cation Exchange Resin ◽  
Information Value ◽  
Ionization Mass ◽  
Beijing City ◽  
Urban Aerosols ◽  
Isotopic Compositions

An interlaboratory study of the National Institute for Environmental Studies (NIES) certified reference material (CRM) No. 28 Urban Aerosols collected from the filters of a central ventilating system in a building in the Beijing city center from 1996 to 2005 was performed to obtain an information value of the Sr isotopic composition. The Sr isotopic composition was measured using multi-collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) to confirm the CRM’s within- and between-bottle homogeneity, and the results showed a 87Sr/86Sr ratio of 0.710227 ± 0.000019 (2SD, n = 18). The Sr isotopic compositions were intercompared using thermal ionization mass spectrometry (TIMS), which showed good agreement with values obtained at NIES. Subsequently, a consistent 87Sr/86Sr ratio was observed between two dissolution (hotplate vs. high-pressure bomb) and Sr separation (Sr spec resin vs. cation exchange resin) methods. To validate and reproduce the accuracy of our analytical methods, the Sr isotopic compositions of secondary reference materials, JB-1b and JA-2, were also measured. Our results showed that NIES CRM No. 28 is appropriate for the quality control of Sr isotope measurements of particulate matter analyses for environmental and geochemical studies.

scholarly journals Metrological assurance of dioxin measurements. A certified reference material for measuring the dioxin mass fraction in animal fat

2019 ◽  
Vol 14 (3-4) ◽  
pp. 17-32 ◽  
Author(s):  
A. G. Budko ◽  
A. Y. Mikheeva ◽  
A. I. Krylov
Keyword(s):  
Reference Material ◽  
Certified Reference Material ◽  
Mass Fraction ◽  
Metrological Traceability ◽  
Isotopic Dilution ◽  
Animal Fat ◽  
Measurement Results ◽  
Mass Fractions ◽  
Certified Values ◽  
Good Agreement

The paper presents information on the development of a new certified reference material (CRM) for mass fraction of dioxins in animal fat, with established metrological traceability. A procedure for preparing and certifying CRM material is given. The GC–LRMS method with isotopic dilution was used as an analytical method for establishing certified characteristics. The uncertainties due to inhomogeneity and instability of the CRM material were estimated in order to account for their contribution to the uncertainty of certified values. In addition, the results of interlaboratory comparisons (ILC) for an experimental batch of the developed CRM are presented. Measurement results provided by ILC participants are shown to be in good agreement with the certified characteristics of the CRM. The certified values of dioxin mass fractions (PCDF group) in the CRM material are established to vary from 1 to 1000 ng / kg, with the relative expanded uncertainty ranging from 10 to 20 %.

scholarly journals Development of in-House Industrial Fluosilicic Acid Certified Reference Material: Certification of H2SiF6 Mass Fraction

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 92
Author(s):  
Said Kounbach ◽  
Mokhtar Ben Embarek ◽  
Abdeljalil Chemaa ◽  
Rachid Boulif ◽  
Rachid Benhida ◽  
...  
Keyword(s):  
Reference Material ◽  
Certified Reference Material ◽  
Analytical Methods ◽  
Mass Fraction ◽  
International System ◽  
Measurement Data ◽  
Metrological Traceability ◽  
Standard Uncertainty ◽  
System Of Units ◽  
Fluosilicic Acid

Fluosilicic acid is a by-product of the chemical phosphate industry, mainly during the manufacture of phosphoric acid and triple super phosphate (TSP). To ensure the accurate measurement of the H2SiF6 mass fraction in this by-product, method validation is required, which needs a certified reference material (CRM) with its traceability to the International System of Units (SI). This work describes the development of a certified reference material of fluosilicic acid, which is commercially unavailable. Details of all steps, such as sample preparation, homogeneity and stability studies, value assignment, establishment of metrological traceability, and uncertainty estimation of the certified reference material, are fully described. The H2SiF6 mass fraction in the CRM was quantified by two analytical methods, i.e., UV-VIS as a primary method of analysis and flame mode atomic absorption spectroscopy (AAS) as a second method. It is worth noting that the results obtained from each method were in good agreement. The CRM certified value and corresponding expanded uncertainty, obtained from the combined standard uncertainty multiplied by the coverage factor (k = 2), for a confidence interval of 95%, was (91.5 ± 11.7) g·kg−1. The shelf life of the developed CRM is determined to be 1 year, provided that storage conditions are ensured. The developed CRM can be applied to validate analytical methods, improve the accuracy of measurement data as well as to establish the meteorological traceability of analytical results.

scholarly journals Development and certification of a reference material for zearalenone in maize germ oil

2021 ◽  
Author(s):  
Juliane Riedel ◽  
Sebastian Recknagel ◽  
Diana Sassenroth ◽  
Tatjana Mauch ◽  
Sabine Buttler ◽  
...  
Keyword(s):  
Reference Material ◽  
Reference Materials ◽  
Mass Fraction ◽  
High Performance ◽  
Certified Reference Materials ◽  
Maximum Level ◽  
Whole Process ◽  
Commission Regulation ◽  
Maize Oil ◽  
Maize Germ

AbstractZearalenone (ZEN), an estrogenic mycotoxin produced by several species of Fusarium fungi, is a common contaminant of cereal-based food worldwide. Due to frequent occurrences associated with high levels of ZEN, maize oil is a particular source of exposure. Although a European maximum level for ZEN in maize oil exists according to Commission Regulation (EC) No. 1126/2007 along with a newly developed international standard method for analysis, certified reference materials (CRM) are still not available. To overcome this lack, the first CRM for the determination of ZEN in contaminated maize germ oil (ERM®-BC715) was developed in the frame of a European Reference Materials (ERM®) project according to the requirements of ISO Guide 35. The whole process of CRM development including preparation, homogeneity and stability studies, and value assignment is presented. The assignment of the certified mass fraction was based upon an in-house study using high-performance liquid chromatography isotope dilution tandem mass spectrometry. Simultaneously, to support the in-house certification study, an interlaboratory comparison study was conducted with 13 expert laboratories using different analytical methods. The certified mass fraction and expanded uncertainty (k = 2) of ERM®-BC715 (362 ± 22) μg kg−1 ZEN are traceable to the SI. This reference material is intended for analytical quality control and contributes to the improvement of consumer protection and food safety. Graphical abstract

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