ME|Chem

In today's final presentation, Eskil Sahlin @RISEsweden describes some alternative approaches for handling asymmetry in measurement uncertainty, using a simple power transform to minimise skewness.

Thanks to all our speakers and session chairs for a really informative two days! For future events, watch our website at or subscribe to our newsletter for news - the subscription link's on our home page at eurachem.org !

Large uncertainties make simple uncertainty intervals difficult. Bertil Magnusson shows how an "Uncertainty Factor" can help by making an asymmetric interval easy to calculate and report.

Michael Koch, of Univ. Stuttgart and AQS Baden-Württemberg, describes a useful software tool for measurement uncertainty evaluation according to ISO 11352 (water quality). The tool is available from aqsbw.de/en

Carla Palma of Portugal's Instituto Hidrográfico, provides a thorough worked example of uncertainty evaluation using validation data in an environmental analysis context.

Do we need to check measurement uncertainty evaluations? Anders Svaneborg of Eurofins Denmark talks about how measurement uncertainty estimates can be checked experimentally, and why we should.

Starting day 2 of our @EurachemEurope webinar on using validation data in measurement uncertainty evaluation, Steve Ellison @NML_ChemBioGC asks whether allowed limits for bias or recovery should be considered in the same way as specifications for other input quantities.

Back to Ricardo Bettencourt da Silva, now, for a close look at using recovery and/or bias information from validation studies.

Ivo Leito of @unitartu starts our workshop with an overview of different approaches to evaluating measurement uncertainty: from detailed modelling to validation and interlaboratory studies.

Measurement uncertainty often depends on measured value. Eskil Sahlen @RISEsweden describes options for adjusting reported MU for measured value.

Digging deeper into the detail: Bertil Magnusson shows how the uncertainty associated with random effects can be determined and adjusted for analyte level.

Ricardo Bettencourt da Silva @FC_UL gives details of forthcoming guidance on Evaluation of measurement uncertainty based on in-house validation data. This will complement the existing measurement uncertainty guide, giving detailed calculations for laboratories.

Revolutionary user-friendly MS-Excel tool for the objective comparison of microplastic contamination in sediment samples. Read the research in ES&T: go.acs.org/1PQ

First evaluation of the uncertainty of microplastic quantification in environmental samples. Objective criteria for assessing differences and trends in microplastic contamination: pubs.acs.org/doi/full/10.10… #environmental #microplastics #uncertainty #validation #metrology

The Limit of Quantification (LOQ) of the difference between two values depends on inputs uncertainty: Spreadsheet to calculate the LOQ of the difference: mechem.rd.ciencias.ulisboa.pt/managing-the-u… #Metrology #Uncertainty #Validation #Accreditation #Qualitycontrol #Quality #Analyticalchemistry

Workshop “Assessment of Performance & Uncertainty in Qualitative Chemical Analysis”: Link to the video of Session 4 (over 200 participants): Qualitative Analysis in Laboratory Medicine: youtu.be/GJzU2UOPvnU #CITAC #Eurachem #QualitativeAnalysis #Uncertainty #Validation

May 2022 Eurachem workshop on ISO/IEC 17025 requirements - First Circular Available eurachem.org/index.php/news…

QC data from multiple laboratories is a rich source of information for measurement uncertainty evaluation for infectious disease assays. - Wayne Dimech

Two very interesting and comprehensive talks already today; looking forward to the next!

Sources of uncertainty include possible causes of misclassification as well as random effects such as variation of signal near a threshold.