Results 31 to 40 of about 64,170 (304)
Alkalinity determination by potentiometry: intercalibration using three different methods
Ciencias Marinas, 2000 Seawater was sampled from different depths in the North Atlantic Ocean (Canary Islands region) and distributed among three different labs for the determination of titration alkalinity.
L Mintrop +4 more
doaj +1 more source
Development of pure certified reference material of squalene
Microchemical Journal, 2023 Weizhu Chen +7 more
openaire +2 more sources
Sr Isotopic Composition of NIES Certified Reference Material No. 28 Urban Aerosols
Frontiers in Environmental Chemistry, 2021 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 ...
Akane Yamakawa +10 more
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Development of a certified reference material for the physical properties of the soil clay (loam)
Стандартные образцы, 2019 Introduction. The article presents results of developing a certified reference material for the physical properties of the soil clay (loam). The certified characteristics of the reference material are as follows: moisture content at the liquid limit via ...
I. N. Matveeva, V. V. Tolmachev
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Preparation of Trace Gold and Gold Ore Reference Materials
Yankuang ceshi, 2021 BACKGROUND From 1986 to 2007, different grades of trace gold certified reference materials (background grade, anomaly grade, medium grade and high grade) and mineral gold certified reference materials (mineralization grade, cutoff grade and concentrate ...
YANG Rong +3 more
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Zhongguo shipin weisheng zazhi, 2021 ObjectiveA method for the preparation and certification of the reference material of tenuazonic acid(TeA) and tentoxin (TEN) in wheat flour was developed.MethodsThe reference material of TeA and TEN in wheat flour was prepared from grain which naturally ...
XIE Ji'an +6 more
doaj +1 more source
Стандартные образцы, 2019 Currently, in the Russian Federation, the metrological traceability of certified reference materials of the composition of gas mixtures in cylinders under pressure produced by manufacturers of certified reference materials is carried out in accordance ...
L. A. Konopelko +2 more
doaj +1 more source
Development of decahydronaphthalene reference material for low flash point measurements
Egyptian Journal of Petroleum, 2021 Certified reference materials are an essential tool for calibration of testing equipment, validation of analytical methods and ensuring quality of test results.
H.E. Ahmed, Ibrahim F. Tahoun, S. Zakel
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Certified reference material to water content determination in bioethanol fuel
Química Nova, 2012 Bioethanol is a strategic biofuel in Brazil. Thus, a strong metrological basis for its measurements is required to ensure the quality and promote its exportation. Recently, Inmetro certified a reference material for water content in bioethanol.
Janaína M. Rodrigues +6 more
doaj +1 more source
Preparation of Certified Reference Materials for Soil Limit Water Content
Yankuang ceshi, 2021 BACKGROUND Soil limit water content is an important basis for fine-grained soil classification and engineering property evaluation. Additionally, it is an important evaluation index for clay exploration and industrial utilization. Inaccurate test results
ZHAO Xiu-feng +4 more
doaj +1 more source