Journal ArticleDOI
Quality assurance in the analysis of foods for trace constituents
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TLDR
An examination of the results of over 50 interlaboratory collaborative studies conducted by the AOAC on various commodities for numerous analytes shows a relationship between the mean coefficient of variation (CV) and the mean concentration measured, expressed as powers of 10, independent of the determinative method.Abstract:
An examination of the results of over 50 interlaboratory collaborative studies conducted by the AOAC on various commodities for numerous analytes shows a relationship between the mean coefficient of variation (CV), expressed as powers of 2, with the mean concentration measured, expressed as powers of 10, independent of the determinative method. Some typical CV values are: drug formulations at a 1% concentration, 2%; sulfonamides in feeds at a 0.01% concentration, 4%; pesticide residues and toxic elements, 10(-6) (1 ppm), 16%; and aflatoxins 10(-8) (10 ppb), 32%. Analytical work at trace levels must be constantly monitored through analysis of reference materials and surrogate samples, and by independent replication.read more
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Joint fao/who food standards programme
TL;DR: A new Draft Codex Strategic Plan was prepared by the Executive Committee Member from North America, with assistance from the Members from Europe and the Southwest Pacific as mentioned in this paper, and the revised draft was considered by the 67 th Session of the executive committee and the 35 th Session.
Journal ArticleDOI
Cumulative uncertainty in measured streamflow and water quality data for small watersheds
TL;DR: In this article, a root mean square error propagation method was used to compare the uncertainty introduced by each procedural category, and then the error propagation was employed to determine the cumulative probable uncertainty in measured streamflow, sediment and nutrient data.
Journal ArticleDOI
Honey quality, methods of analysis and international regulatory standards: Review of the work of the International Honey Commission
S Bogdanov,C Lüllmann,P Martin +2 more
TL;DR: In this paper, the authors present knowledge on the different quality criteria used in the determination of the following quality factors: moisture, ash, acidity, HMF, apparent reducing sugars, apparent sucrose, diastase activity and water-insoluble matter.
Journal ArticleDOI
Validation of a HPLC method for simultaneous determination of main organic acids in fruits and juices
Rodrigo Scherer,A. C. P. Rybka,Cristiano Augusto Ballus,Adriana Dillenburg Meinhart,José Teixeira Filho,Helena Teixeira Godoy +5 more
TL;DR: In this article, a liquid chromatographic method for fast and simultaneous determination of tartaric, malic, ascorbic and citric acids was validated for further application to fruits and juices.
Journal ArticleDOI
A Two-Component Model for Measurement Error in Analytical Chemistry
David M. Rocke,Stefan Lorenzato +1 more
TL;DR: In this paper, a new model for measurement error in analytical chemistry was proposed and tested using maximum likelihood estimation and applied to toluene by gas-chromatography/mass-spectrometry and cadmium by atomic absorption spectroscopy.
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