Codex @codex  0

Analyst127(5),689–691(2002), DOI10.1039/b200922f. Primary indexed byline Michael Thompson, Paul Willetts, Sharron Anderson, Paul Brereton and Roger Wood. Abstract: multiple samplers collected wheat and green coffee; significant between-sampler variation for two wheat analytes, no significant sampling-reproducibility variation for coffee but significant sampling-repeatability variation.

Pure and Applied Chemistry71(2),337–348(1999), DOI10.1351/pac199971020337. Original byline Michael Thompson, Steven L. R. Ellison, Aleš Fajgelj, Paul Willetts and Roger Wood. Publisher index spells the title Harmonized; the original PDF prints Harmonised. Recommendation1 reporting provisions are reproduced in the Codex adoption text www.fao.org/4/x9945e/x9945e0k.htm : identify correction status, magnitude and derivation.

Official Eurachem-hosted full text: www.eurachem.org/images/stories/Guides/pdf/recovery.pdf . PDF p1 gives the full byline and affiliations; §§3.2–3.2.2 distinguish native and surrogate recovery and spiking; §3.3 discusses matrix mismatch; §5.1 discusses representative recovery studies; §6 and the Appendix discuss correction by recovery and propagated uncertainty. The Recommendations specify reporting whether correction was applied.

Primary source: publications.iupac.org/pac/78/1/0145/index.html

Verified locator: Pure and Applied Chemistry 78, 145–196 (2006), DOI 10.1351/pac200678010145. Full primary report inspected via governmental mirror www.sfda.gov.sa/sites/default/files/pdfs-files/HarmonisedProtocolProficiencyTesting.pdf . Byline Michael Thompson, Stephen L. R. Ellison and Roger Wood. Appendix 1 A1.1 printed p. 177 recommends at least ten random containers and duplicate test portions in randomized measurement order; A1.2 gives ANOVA estimates; §3.11.2 p. 171 distinguishes sufficient homogeneity from zero sampling variance.

Measurement-order locators: Appendix 1, A1.1 (printed p. 177) requires randomized analysis of duplicate portions and checks for suspect trends; A1.3 (printed pp. 179–180) gives detailed laboratory instructions, including randomized order for the analytical operations. These support separating material variation from time-dependent analytical effects. Inspected primary report mirror: www.sfda.gov.sa/sites/default/files/pdfs-files/HarmonisedProtocolProficiencyTesting.pdf .