Discussion on homogeneity assessment of reference materials based on uncertainty comparison method

An uncertainty comparison method is proposed to assess the homogeneity of reference materials. The method compares “standard uncertainty associated with between-unit variability” ( u bb ) with “target standard uncertainty” ( u trg ) or “measurement uncertainty” ( u meas ) to solve the problems in as...

Full description

Saved in:
Bibliographic Details
Published in:Accreditation and quality assurance 2018-04, Vol.23 (2), p.103-108
Main Authors: Liu, Chonghua, Ding, Zhiyong, Tian, Yong, Yi, Lezhou, Huang, Ningshan
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biochemistry
Chemistry
Chemistry and Materials Science
Commercial Law
Ecotoxicology
Food Science
Homogeneity
Marketing
Practitioner's Report
Property values
Reference materials
Standard deviation
Test methods
Toys
Uncertainty
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An uncertainty comparison method is proposed to assess the homogeneity of reference materials. The method compares “standard uncertainty associated with between-unit variability” ( u bb ) with “target standard uncertainty” ( u trg ) or “measurement uncertainty” ( u meas ) to solve the problems in assessing homogeneity of reference materials. Methods for the calculation of u bb , u trg and u meas as well as criterion for the quantitative judgment of sample homogeneity are introduced. When u bb  ≤ 0.3 u trg , it shows the sample is considered to be homogeneous; when 0.3 u trg   0.7 u trg , the sample is considered to be inhomogeneous. The uncertainty comparison method is compared with the F test method and shown to be more objective for the assessment of the homogeneity of certified reference materials for the chemical testing of toys.
ISSN:0949-1775
1432-0517
DOI:10.1007/s00769-017-1308-2