Results 211 to 220 of about 76,962 (259)

A Certified Reference Material for HPLC

Chromatographia, 2005
A column and test samples have been produced as a Certified Reference Material (CRM) for use in HPLC. A round robin certification procedure has demonstrated that the retention and relative retention properties of the column, measured as the values of shape selectivity, hydrophobicity and ion-exchange activity at pH 7.0, under closely specified ...
R. M. Smith, S. Dube
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Reference materials and certified reference materials for spectrometry in Romania

Fresenius' Journal of Analytical Chemistry, 2001
Several reference materials (RMs) and certified reference materials (CRMs) are widely used in Romania as measurement standards in different spectrochemical measurements. Among them, single element standard solution certified for their mass concentration play a key role in ensuring the required traceability of results expressed in this measurement unit.
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Development of pure certified reference material of stevioside

Food Chemistry, 2018
Pure stevioside was extracted from leaves of Stevia rebaudiana (Bertoni) to be used as a reference material in the instrument calibration or method validation process. The mass fraction was determined by comparison between the mass balance method and quantitative nuclear magnetic resonance (qNMR) spectroscopy. The impurities in the sample were analyzed
Nongluck Tangpaisarnkul, Patoomratana Tuchinda, Prapin Wilairat, Atitaya Siripinyanond, Juwadee Shiowattana, Saksit Nobsathian   +5 more
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Are certified reference materials a victim of quality systems? The need for working matrix-certified reference materials

Fresenius' Journal of Analytical Chemistry, 1998
The use of natural matrix-certified reference materials by commercial environmental laboratories is increasing rapidly. These materials are now an essential component of the quality systems of most commercial environmental laboratories. The use is increasing faster than existing producers, principally government agencies, can meet. The use of data from
P. J. Jenks, A. Henk Boekholt, John F. N. Maaskant, Robert D. Rucinski   +3 more
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Certified reference materials for the determination of mycotoxins

Mycotoxin Research, 2002
A continuing fundamental trend in the area of quality assurance in analytical laboratories are measures that enable trace-ability of analytical results to internationally renowned units, like e.g. the mole. Especially certified reference materials (CRMs) are important tools for achieving this goal. What are CRMs?
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A DANREF Certified Reference Material for Chromate in Cement

The Analyst, 1997
Two candidate reference materials for chromate in cement were produced in the DANREF network and certified in an interlaboratory study. Fifteen laboratories participated in the interlaboratory study and six different analytical methods were used. The certified values were estimated as the consensus mean of laboratory mean values (outliers excluded ...
J, Kristiansen, J M, Christensen, K, Byrialsen   +2 more
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Certification of a new certified reference material of honokiol

Analytical and Bioanalytical Chemistry, 2015
Honokiol is the most important active pharmaceutical ingredient in Magnolia officinalis, which is a famous traditional Chinese medicine and commonly used in clinical practice. In order to control the quality of honokiol and related pharmaceuticals, a new certified reference material (CRM) of honokiol was developed.
Shiying, Yang, Dezhi, Yang, Kun, Hu, Haohui, Zhou, Yonghui, Guo, Guanhua, Du, Yang, Lu   +6 more
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Reference materials and certified reference materials for water and food microbiology

Fresenius' Journal of Analytical Chemistry, 1993
The concept of Certified Reference Materials (CRMs) for the verification of the accuracy of analytical methods and the traceability of the results to a CRM, is well accepted in chemistry. The use of Reference Materials (RMs) for intra-laboratory quality control schemes or for round-robin and proficiency testing is well established and follows from ...
E. A. Maier, B. Griepink, P. H. in't Veld, K. Mooijman, A. H. Havelaar   +4 more
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Availability of reference materials: COMAR the database for certified reference materials

Accreditation and Quality Assurance, 2003
COMAR is the international database for certified reference materials. A new user-friendly web-based version, COMAR2, has been developed by BAM and CONET Consulting AG which will be available in December 2002. The advantages of COMAR2 are briefly explained.
Rita Pradel, Thomas Steiger, Harry Klich
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Certified Reference Materials for the Characterisation of Multifunctional Materials

Materials Science Forum, 2005
Multifunctional materials are created by intimately integrating different materials. The assessment of the local properties and composition of the different components of such a multifunctional material necessarily relies on techniques with sufficient spatial resolution.
Gert Roebben, Uwe Wätjen, Andrée Lamberty   +2 more
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