Operation of a proficiency testing scheme of trace elements in sewage sludge with reference values

Veen, Adriaan M. H. van der; Horvat, Milena; Milačić, Radmila; Bučar, T.; Repinc, U.; Ščančar, Janez; Jačimović, Radojko

doi:10.1007/s007690100330

Cited by 7 publications

(2 citation statements)

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“…In this way, proficiency studies can be conducted that incorporate traceable assigned values, but require little extra effort over the consensus based approach [13,14].…”

Section: Presentation Of Data and Reporting Of Participant Performancementioning

confidence: 99%

Achieving traceability in chemical measurement—a metrological approach to proficiency testing

Armishaw¹,

King²,

Millar³

2003

Accred Qual Assur

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ISO/IEC 17025 requires that testing laboratories establish the traceability of their measurements, preferably to the SI units of measurement. The responsibility for establishing traceability lies with each individual laboratory and must be achieved by following a metrological approach.The results of measurements made in such a way are traceable to the standards used in method validation and to the calibration standards used during the measurement process. If these standards are traceable to SI then the measurements will also be traceable to SI.Participation in appropriate proficiency studies (an ISO/IEC 17025 requirement) enables laboratories to demonstrate the comparability of their measurements. If the materials used for the studies have traceable assigned values, then proficiency testing also provides information about measurement accuracy and confirms, or otherwise, that appropriate traceability has been established. This paper will report on a new approach for the establishment of traceable assigned values for chemical testing proficiency studies. The work is conducted at a "fit for purpose" level of measurement uncertainty, with costs contained at a level similar to previous "consensus" based proficiency studies. By establishing traceable assigned values in a cost effective way, NARL aims to demonstrate the added value of the metrological approach to participant laboratories.

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“…In this way, proficiency studies can be conducted that incorporate traceable assigned values, but require little extra effort over the consensus based approach [13,14].…”

Section: Presentation Of Data and Reporting Of Participant Performancementioning

confidence: 99%

Achieving traceability in chemical measurement—a metrological approach to proficiency testing

Armishaw¹,

King²,

Millar³

2003

Accred Qual Assur

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“…If the outliers were rejected, the ratio s b /s w remained mainly below 10, being highest for samples SAT25 and SAT20 for DO measurement and T25 for temperature measurement. For the robust measurements the ratio s b /s w should not exceed three [24]. High values were observed mainly due to very low within-laboratory standard deviation.…”

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confidence: 99%

Dissolved Oxygen Concentration Interlaboratory Comparison: What Can We Learn?

Näykki

Jalukse

Helm

et al. 2013

Water

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Dissolved oxygen concentration is a key parameter for characterizing natural and wastewaters and for assessing the global state of the environment in general. The decrease of dissolved oxygen levels in the world's oceans, which is becoming increasingly obvious, is expected to have an impact on the whole ecosystem of the Earth, including the carbon cycle, the climate, etc. Dissolved oxygen measurements by sensors are often deemed easy measurements by routine laboratories. In reality, the physical and chemical processes underlying the measurements are complex and these measurements are not at all as robust as often considered. Recently an international in situ interlaboratory comparison measurement of dissolved oxygen concentration took place at the University of Tartu. The results revealed that the routine laboratories as a rule still do not fully master the art of dissolved oxygen concentration measurement: Out of altogether 63 measurement results obtained by the participants 52% were unacceptable according to the En numbers. Based on the analysis of the results of the intercomparison a set of tools and recommendations are given to the participants of how to improve the quality of their results.

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Achieving traceability in chemical measurement — a metrological approach to proficiency testing

Armishaw¹,

King²,

Millar³

2003

Traceability in Chemical Measurement

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Operation of a proficiency testing scheme of trace elements in sewage sludge with reference values

Cited by 7 publications

References 0 publications

Achieving traceability in chemical measurement—a metrological approach to proficiency testing

Achieving traceability in chemical measurement—a metrological approach to proficiency testing

Dissolved Oxygen Concentration Interlaboratory Comparison: What Can We Learn?

Achieving traceability in chemical measurement — a metrological approach to proficiency testing

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