Measurement principles for traceability in chemical analysis

Bièvre, Paul De; Kaarls, Robert; Peiser, H. S.; Rasberry, Stanley D.; Reed, William P.

doi:10.1007/3-540-27093-0_1

Cited by 20 publications

(27 citation statements)

References 14 publications

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“…7 (2) where, MS between is the between-bottle mean square estimate from the homogeneity ANOVA test; MS within is the withinbottle mean square estimate from the homogeneity ANOVA test; n 0 is the corrected number of results of the ANOVA test in the case of missing values.…”

Section: Atomic Absorption Spectrometrymentioning

confidence: 99%

“…1 However, the use of properly validated methods and the implementation of measurement traceability links are fundamental for proper evaluation of such studies and for the comparability of analytical results obtained at different places and periods of time. 2,3 The use of certified reference materials (CRM) with matrix similar to the matrix of the analyzed samples is a straightforward mean to attain quality assurance in analytical laboratories, i.e., to obtain analytical results with accuracy that is fit for its intended use. 4,5 Reference materials (RMs) and certified reference materials (CRMs) play a fundamental role in quality assurance of analytical laboratories as they are used for calibration purposes, measurement procedure validation and in realization of the metrological traceability chain of measurement results.…”

Section: Introductionmentioning

confidence: 99%

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Interlaboratory Comparison for the Characterization of a Brazilian Mussel Reference Material

Moreira¹,

Vasconcellos²,

Maihara³

et al. 2017

J. Braz. Chem. Soc.

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Bivalve mollusks have long been used in biomonitoring studies to assess seawater environmental status. The use of suitable certified reference materials is a straightforward means to attain quality assurance in such studies as they allow the traceability of measurement results, making it possible the comparison of data obtained at different places and periods of time. This paper describes the certification of element mass fractions for a Perna perna mussel reference material produced in Brazil. After homogeneity and stability studies, an interlaboratory comparison was performed for element characterization. Robust means were taken as assigned values and contributions due to element characterization and from homogeneity and stability studies were taken into account to yield expanded uncertainties. From the adopted certification criteria, informative values for 20 elements were obtained and it was possible to assign certified values for the following 16 elements: Al, As,

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Section: Atomic Absorption Spectrometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interlaboratory Comparison for the Characterization of a Brazilian Mussel Reference Material

Moreira¹,

Vasconcellos²,

Maihara³

et al. 2017

J. Braz. Chem. Soc.

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“…The true value of a sample composition is invariant for the homogeneous molecular population, as shown in equation (3). Then, the amount-of-substance fraction of the subsample H is equal to the amount-of-substance fraction of the original sample S, i.e.…”

Section: Mathematical Proof Combined With a Homogenization Thought Exmentioning

confidence: 99%

“…Each day, millions of such measurements are carried out worldwide, forming the bases for many important medical, environmental, economic, and legal decisions which rely on their accuracy [3] [4]. The "true value" is the philosophical basis of accurate measurement [5].…”

Section: Introductionmentioning

confidence: 99%

The True Value of a Sample Composition Is There

Hong¹,

Yi²

2015

AJAC

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The core objective of a chemical composition measurement is to determine its true value. However, when measuring the composition of a macroscopic sample with a large number of atoms or molecules, realizing the true value of the measurand at both the macroscopic and microscopic levels remains an unsolved theoretical problem. We find that the true value of a sample composition exists in any subsample of a homogeneous molecular population of the sample. Here, we propose the Central Law of Measurement of the Amount of Substance: "The homogeneity of a sample molecular population represents the measurement accuracy of the sample composition in an analytical procedure". The Central Law is based on a homogeneous molecular population axiom in which the molecular composition of a sample is identical for any homogeneous subsample. Furthermore, we point out that, at the microscopic scale, Avogadro's law does not hold true.

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“…Another important tool to promote the introduction of metrological principles in chemical measurement was this Journal [10,11], started in 1996. It was-and still is-an almost ideal instrument for establishing the connection to the SI of chemical measurement results obtained through measurements of elements, isotopes and molecular compounds.…”

mentioning

confidence: 99%