Accreditation and Quality Assurance

Items from 1 to 8 out of 8 results

article

Measurement uncertainty: requirements set in the accreditation standards

Kyriacos C. Tsimillis

Accreditation and Quality Assurance > 2018 > 23 > 2 > 109-114

Measurement uncertainty is of high importance to all testing and calibration laboratories and those involved in sampling activities. Its evaluation requires good understanding of the method implemented and realisation of all factors contributing to it. It is required that the users of the results fully understand the meaning of uncertainty stated on test reports and calibration certificates and, when...

article

Congresses, conferences, workshops and courses

Accreditation and Quality Assurance > 2018 > 23 > 2 > 123-123

article

Quality system implementation in the National Metrology Institute of Montenegro

Vanja Asanovic, Milena Raonic, Naina Cuturic-Knezevic, Goran Vukoslavovic, more

Accreditation and Quality Assurance > 2018 > 23 > 2 > 87-96

Accreditation of calibration laboratories is a means for achieving competence recognition and assuring customers that their calibration services are accurate and reliable. Moreover, it is a powerful tool for a National Metrology Institute (NMI), enabling the formal acceptance of its measurement results. It could be especially useful when calibration activities are performed in well-developed laboratories,...

article

Discussion on homogeneity assessment of reference materials based on uncertainty comparison method

Chonghua Liu, Zhiyong Ding, Yong Tian, Lezhou Yi, more

Accreditation and Quality Assurance > 2018 > 23 > 2 > 103-108

An uncertainty comparison method is proposed to assess the homogeneity of reference materials. The method compares “standard uncertainty associated with between-unit variability” (u_bb) with “target standard uncertainty” (u_trg) or “measurement uncertainty” (u_meas) to solve the problems in assessing homogeneity of reference materials. Methods for the calculation of u_bb, u_trg and u_meas as well as criterion...

article

The hitherto non-included component in the uncertainty budget for gravimetric measurement of particulate matter concentration in a conduit

Przemysław Kateusz

Accreditation and Quality Assurance > 2018 > 23 > 2 > 73-86

This article discusses the accuracy of the gravimetric measurement method of total particulate matter concentration in waste gases where the basic assumption is that sample collection of dust-laden gas is done in a grid with a finite number of points in the conduit’s measurement plane. In this standard approach, the sample is assumed to be representative for dust-laden gas in the conduit, and consequently,...

article

Measurements recovery evaluation from the analysis of independent reference materials: analysis of different samples with native quantity spiked at different levels

Rui M. S. Cordeiro, Constantino M. G. Rosa, Ricardo J. N. Bettencourt da Silva

Accreditation and Quality Assurance > 2018 > 23 > 2 > 57-71

Measurement uncertainty evaluation involves combining uncertainty components reflecting all relevant random and systematic effects: the precision and trueness uncertainty components, respectively. Typically, trueness is assessed through the analysis of various materials with known reference value, such as certified reference materials (CRMs) or spiked samples, from which it should be decided about...

article

Occurrence of nitrate in vegetables and dietary exposure assessment for the Cypriot adolescent consumers

Georgios Stavroulakis, Demetris Kafouris, Maria Christofidou, Lefkios Paikousis, more

Accreditation and Quality Assurance > 2018 > 23 > 2 > 115-122

In this study, a simple, rapid and sensitive ion chromatography method was used for the determination of mass fraction nitrate (mg kg⁻¹) in 396 samples of vegetables. The method performance characteristics were determined after spiking blank samples. The mean recoveries in vegetables ranged from 94.0 % to 108.7 %. Limits of detection and quantification were 10 mg kg⁻¹ and 30 mg kg⁻¹, respectively...

article

Trueness verification survey for blood lead concentration measurement in Chinese clinical laboratories

Shuai Yuan, Wei Wang, Jianping Li, Mingxia Liu, more

Accreditation and Quality Assurance > 2018 > 23 > 2 > 97-102

The results of trueness verification for blood lead measurement were analyzed in a 2016 nationwide external quality assessment (EQA) survey, in order to evaluate current approaches of blood lead measurement in Chinese Laboratories and their traceability to certified reference materials (CRMs). A panel of 2 frozen whole blood CRMs with values assigned by an absolute quantitative method was provided...

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23
Year:
2018

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Keywords

ACCREDITATION (2)
MEASUREMENT UNCERTAINTY (2)
REFERENCE MATERIAL (2)
TRACEABILITY (2)
BLOOD LEAD (1)
CALIBRATION (1)
CERTIFIED REFERENCE MATERIAL (1)
CONFORMITY ASSESSMENT BODY (1)
DIETARY EXPOSURE (1)
DISTRIBUTION OF PARTICULATE MATTER CONCENTRATION IN THE CONDUIT (1)
GAS VELOCITY DISTRIBUTION IN THE CONDUIT (1)
GRAVIMETRIC MEASUREMENT (1)
HOMOGENEITY ASSESSMENT (1)
ICP-OES (1)
ION CHROMATOGRAPHY (1)
ISO/IEC 17025 (1)
MEASUREMENT DEVIATION (1)
METALS (1)
METROLOGICAL TRACEABILITY (1)
METROLOGY (1)
NITRATE (1)
PARTICULATE MATTER CONCENTRATION IN WASTE GAS (1)
PROFICIENCY TESTING (1)
QMS (1)
RECOVERY (1)
TARGET STANDARD UNCERTAINTY (1)
TRUENESS VERIFICATION (1)
UNCERTAINTY (1)
UNCERTAINTY COMPARISON METHOD (1)
VALIDATION (1)
VEGETABLES (1)
WATER (1)
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