New certified reference materials and proficiency test for environmental radioactivity measurements

2016 ◽  
Vol 21 (5) ◽  
pp. 351-360 ◽  
Author(s):  
Abdulghani Shakhashiro ◽  
Paul Doherty ◽  
Jasmina Kožar Logar ◽  
Branko Vodenik ◽  
Leen Verheyen ◽  
...  
Keyword(s):  
Reference Materials ◽  
Proficiency Test ◽  
Certified Reference Materials ◽  
Environmental Radioactivity ◽  
Radioactivity Measurements

Consensus evaluation of radioactivity-in-soil reference materials in the context of an NPL Environmental Radioactivity Proficiency Test Exercise

2017 ◽  
Vol 126 ◽  
pp. 263-266 ◽  
Author(s):  
Julian Dean ◽  
Sean Collins ◽  
Maria Garcia Miranda ◽  
Peter Ivanov ◽  
Cyrus Larijani ◽  
...  
Keyword(s):  
Reference Materials ◽  
Proficiency Test ◽  
Environmental Radioactivity ◽  
Test Exercise

scholarly journals Geological materials testing and uncertainty calculations: a simple GUM-based algorithm

2013 ◽  
Vol 47 (4) ◽  
pp. 2081
Author(s):  
D. Xirouchakis ◽  
A. Bouzinos
Keyword(s):  
Standard Deviation ◽  
Reference Materials ◽  
Proficiency Test ◽  
Certified Reference Materials ◽  
Physical And Mechanical Properties ◽  
Standard Uncertainty ◽  
Materials Testing ◽  
Geological Materials ◽  
Repeatability Standard Deviation ◽  
Proficiency Test Data

We have applied a simple GUM-based procedure to estimate the uncertainties of physical and mechanical properties in geological materials. First, we define the quantity to measure and decide whether we want to work with units or relative quantities. Subsequently, we calculate the repeatability standard deviation (sr) and the standard uncertainty. If we have proficiency test data or use certified reference materials, we use them to estimate the laboratory bias, the reproducibility standard deviation (sR) and the reproducibility standard uncertainty. We also make sure that we know or have estimated the standard uncertainty of the instruments that we use in the measurements. The latter is typically taken from the instrument calibration or precision statement. We estimate the standard uncertainty of the reference materials and the standard uncertainty of the laboratory bias. The final two steps include the calculation of (1) the laboratory standard uncertainty uncorrected for bias and corrected for bias, and (2) the laboratory expanded uncertainty at the 95% confidence limit.

Development of reference materials with the composition of propyl and isopropyl alcohol solutions

2020 ◽  
pp. 66-72
Author(s):  
Irina A. Piterskikh ◽  
Svetlana V. Vikhrova ◽  
Nina G. Kovaleva ◽  
Tatyana O. Barynskaya
Keyword(s):  
Reference Materials ◽  
Measurement Errors ◽  
Isopropyl Alcohol ◽  
Certified Reference Materials ◽  
Toxic Substances ◽  
Biological Objects ◽  
Margin Of Error ◽  
Measurement Results ◽  
And Control ◽  
Characteristic Mass

Certified reference materials (CRM) composed of propyl (11383-2019) and isopropyl (11384-2019) alcohols solutions were created for validation of measurement procedures and control of measurement errors of measurement results of mass concentrations of toxic substances (alcohol) in biological objects (urine, blood) and water. Two ways of establishing the value of the certified characteristic – mass consentration of propanol-1 or propanol-2 have been studied. The results obtained by the preparation procedure and comparison with the standard are the same within the margin of error.

PROGRESS ON THE DEVELOPMENT OF CERTIFIED REFERENCE MATERIALS FOR Aβ1-42

2017 ◽  
Vol 13 (7) ◽  
pp. P1512
Author(s):  
Sébastien Boulo ◽  
Julia Kuhlmann ◽  
Andreas Leinenbach ◽  
Tobias Bittner ◽  
Leentje Demeyer ◽  
...  
Keyword(s):  
Reference Materials ◽  
Certified Reference Materials

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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