NDLI: Uncertainty sources in UV-Vis spectrophotometric measurement

Content Provider	Springer Nature Link
Author	Sooväli, Lilli Rõõm, Eva Ingrid Kütt, Agnes Kaljurand, Ivari Leito, Ivo
Copyright Year	2006
Abstract	An overview is given of the most important uncertainty sources that affect analytical UV-Vis spectrophotometric measurements. Altogether, eight uncertainty sources are discussed that are expected to have influence in chemical analysis. It is demonstrated that the well-known intrinsic (or “physical”) sources of uncertainty that originate from the instrument itself (repeatability of spectrophotometer reading, spectrophotometer drift, stray light, etc.) often have significantly lower contributions to the combined uncertainty of the result than the “chemical” sources of uncertainty that originate from the object under study (interference from the constituents of the matrix, decomposition of the photometric complex, etc.). Although selectivity of a photometric procedure is often considered more a validation topic than an uncertainty topic, it is very often important to include it also in the uncertainty budget.Usually the most difficult part of uncertainty estimation of a chemical measurement result is to evaluate the magnitude of the actual uncertainty components, especially the chemical ones. For most of the uncertainty sources discussed in this paper, approaches for their evaluation are given. A generic uncertainty budget for absorbance is presented.
Starting Page	246
Ending Page	255
Page Count	10
File Format	PDF
ISSN	09491775
Journal	Accreditation and Quality Assurance
Volume Number	11
Issue Number	5
e-ISSN	14320517
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-04-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	UV-Vis spectrophotometry Measurement uncertainty Uncertainty sources Drift Repeatability Nonlinearity Selectivity Marketing Ecotoxicology Commercial Law Biochemistry Food Science Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Instrumentation Chemical Engineering Safety, Risk, Reliability and Quality

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