NDLI: Comparability of measurement results for pesticide residues in foodstuffs: an open issue?

Content Provider	Springer Nature Link
Author	Bettencourt da Silva, Ricardo J. N. Camões, Maria Filomena G. F. C.
Copyright Year	2010
Abstract	The dispersion of results from proficiency tests for the analysis of pesticide residues in foodstuffs suggests that improvements in the compatibility of measurement results are needed. Currently observed divergences can make the evaluation conclusion on foodstuffs compliance with certain legislation dependent on the consulted laboratory. This work discusses the origin and impact of this lack of compatibility, following the metrological concepts presented at the latest version of the “International Vocabulary of Metrology” (VIM3), thus allowing for a clear diagnostic of the problem. The reporting of results from different measurement methods uncorrected for the observed analyte recovery makes them traceable to different “operationally defined measurement procedures” (VIM3) and, therefore, not comparable. When results from different measurement methods are reported corrected for analyte recovery, R, and R is different for spiked and incurred residues, measurement results may be not compatible if this effect is not considered on the uncertainty budget. This discussion is illustrated with metrological models for any possible combination of “measurement performance” and “maximum residue level”. These models are complemented with experimental data of the analysis of pesticide residues in a sample of ginseng powder from a proficiency test. The adopted experimental design allowed the identification of additional threats to metrological compatibility in this field. Solutions to the faced problem are discussed for practicability and impact on regulatory issues. The use of a universal “reference measurement procedure” proves to be the most feasible way of ensuring comparability of measurements in this field.
Starting Page	691
Ending Page	704
Page Count	14
File Format	PDF
ISSN	09491775
Journal	Accreditation and Quality Assurance
Volume Number	15
Issue Number	12
e-ISSN	14320517
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metrological comparability Metrological traceability Measurement uncertainty Pesticide residues Foodstuffs Marketing Ecotoxicology Biochemistry Analytical Chemistry Commercial Law Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry Instrumentation Chemical Engineering Safety, Risk, Reliability and Quality

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