Preparation of certified reference materials of traces of chromium and arsenic in high purity water and infant milk powder

1993 ◽  
Vol 345 (2-4) ◽  
pp. 278-281 ◽  
Author(s):  
P. K. Gupta ◽  
Chetna Kaw ◽  
Sunita Ganju ◽  
A. K. Agrawal ◽  
R. Ramchandran ◽  
...  
Keyword(s):  
Reference Materials ◽  
High Purity ◽  
Certified Reference Materials ◽  
Milk Powder ◽  
Infant Milk Powder

Preparation and certification of natural and 82Se-labelled selenomethionine reference materials

2021 ◽  
Vol 36 (2) ◽  
pp. 416-428
Author(s):  
Kelly L. LeBlanc ◽  
Phuong-Mai Le ◽  
Juris Meija ◽  
Jianfu Ding ◽  
Jeremy E. Melanson ◽  
...  
Keyword(s):  
Reference Materials ◽  
High Purity ◽  
Certified Reference Materials ◽  
Isotopic Abundance ◽  
Natural Isotopic Abundance

Herein, we present the certification campaign for two new selenomethionine Certified Reference Materials: SENS-1, a high-purity powder of natural isotopic abundance, and SEES-1, a solution of selenium-82 labelled selenomethionine.

BCR (non-certified) reference materials for dioxins and furans in milk powder

1995 ◽  
Vol 352 (1-2) ◽  
pp. 179-183 ◽  
Author(s):  
E. A. Maier ◽  
R. Van Cleuvenbergen ◽  
G. N. Kramer ◽  
L. G. M.Th. Tuinstra ◽  
J. Pauwels
Keyword(s):  
Reference Materials ◽  
Certified Reference Materials ◽  
Milk Powder ◽  
Dioxins And Furans

Application of microbiological (certified) reference materials

1997 ◽  
Vol 35 (11-12) ◽  
pp. 467-470 ◽  
Author(s):  
K. A. Mooijman ◽  
A. H. Havelaar
Keyword(s):  
Reference Materials ◽  
Certified Reference Materials ◽  
Milk Powder ◽  
Optimal Number ◽  
Power Calculation ◽  
Calculation Technique ◽  
Certified Value ◽  
Degree Of Control ◽  
The Difference ◽  
The Given

The development of microbiological reference materials (RMs) has succesfully led to the certification of six materials (CRMs) and to the production of a wider range of non-certified reference materials. Both materials (RM and CRM) are prepared in the same way. They consist of gelatin capsules filled with milk powder artificially contaminated with a selected test strain. The difference between an RM and a CRM is the degree of control of the materials. Because of this difference the RMs and CRMs differ largely in price and application. An RM is intended to be used in daily quality control (QC) of microbiological (routine) analysis. For this purpose the use of a control chart can be very useful. A CRM is intended to be used incidentally, e.g. for validation of a (new) method, or for a complete check of the performance of the laboratory and technicians. The certified value of a microbiological CRM is method dependent. A user of a CRM will compare their mean results with the given certified value and confidence limits. With a so-called power calculation technique the optimal number of capsules and replicates for a CRM were calculated.

scholarly journals Development of High-purity Certified Reference Materials for 17 Proteinogenic Amino Acids by Traceable Titration Methods

2015 ◽  
Vol 31 (8) ◽  
pp. 805-814 ◽  
Author(s):  
Megumi KATO ◽  
Taichi YAMAZAKI ◽  
Hisashi KATO ◽  
Sakae EYAMA ◽  
Mari GOTO ◽  
...  
Keyword(s):  
Amino Acids ◽  
Reference Materials ◽  
High Purity ◽  
Certified Reference Materials

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.

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