Results 31 to 40 of about 470,573 (297)

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, YIN Wei-Gang, ZHANG Ju-xia, PAN Han-jiang   +3 more
doaj   +1 more source

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, Evelyn F. Guimarães, Marcus V. B. Sousa, Viviane F. Silva, Isabel C. S. Fraga, Vanderléa Souza, Valnei S. Cunha   +6 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
doaj   +1 more source

The problem of improving the quality of seriously issued certified reference materials of the composition of gas mixtures

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, A. V. Kolobova, O. V. Fatina   +2 more
doaj   +1 more source

Preparation and certification of wheat flour reference material for tenuazonic acid and tentoxin using isotope dilution- liquid chromatography-tandem mass spectrometry

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, LIU Bolin, ZHAO Ziwei, YANG Xin, ZHANG Lei, YANG Dajin, ZHAO Yunfeng   +6 more
doaj   +1 more source

Development of reference materials for the determination of calcium, iron, selenium, and zinc in dietary supplements

Tạp chí Kiểm nghiệm và An toàn thực phẩm
Food supplements are increasingly popular among consumers because of their convenience and nutritional value. Among the ingredients, essential minerals are added a lot because of their effects on health at all ages especially calcium (Ca), iron (Fe ...
Tran Thanh Son, Van Ket Dang, Cuong Dang Huu, Trang Tran Thi Thu, Nguyen Nguyen Thi Thao, Oanh Dang Thi   +5 more
doaj   +1 more source

Development of a certified reference material: ethanol in water - a practical case

Brazilian Archives of Biology and Technology, 2006
The present work describes the development of a certified reference material (CRM) composed of solutions of ethanol in water in five different concentrations, and all stages necessary for the development of an CRM, according to the guidelines of ISO ...
Vanderléa de Souza, Janaína Marques R. Caixeiro, Rafael A. L. da Silva, Leandro R. Pedro, Renata M. H. Borges, Paulo R. G. Couto   +5 more
doaj   +1 more source

Certified Reference Material of Tylosin Tartrate

Measurement Standards. Reference Materials, 2023
To date, antibiotics are often used in the treatment of infectious diseases in medicine and veterinary medicine, as well as growth promoters in animal husbandry. The uncontrolled use of antibiotics leads to antibiotic residues in food products that are easily transmitted to humans through food chains.
A. Yu. Gulyaeva, A. Y. Khrushchev, S. V. Kolyachkina, V. B. Muravieva, S. V. Antonova   +4 more
openaire   +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, GAO Xiao-li, CAO Lei, CAO Jing-yang, LU Xin-cheng   +4 more
doaj   +1 more source

Caracterização detalhada de material de referência certificado de carvão brasileiro

Química Nova, 2013
The use and characterization of the first Certified Reference Material (CRM) of Brazilian coal for analytical quality control are presented. All results were determined within the limits of repeatability and reproducibility allowed under the standards ...
Vera L. V. Fallavena, Cristiane S. de Abreu, Taísi D. Inácio, Marçal Pires, Carla M. N. Azevedo, Iolanda D. Fernandes, Lizete S. Ferret, M. Rosa Martinez Tarazona   +7 more
doaj   +1 more source