The watershed manipulation project: Case study of an inter laboratory comparison program

Autor:	Heather E. Erickson, Deborah S. Coffey
Rok vydání:	1991
Předmět:	Measure (data warehouse) Watershed Operations research business.industry Comparability General Medicine Replicate Library and Information Sciences Education Transport engineering Data quality Comparison study Environmental science Inter-laboratory business Quality assurance
Zdroj:	Accountability in Research. 1:195-206
ISSN:	1545-5815 0898-9621
DOI:	10.1080/08989629108573793
Popis:	A major quality assurance challenge for interdisciplinary, multi‐institutional, environmental research projects is assessing and achieving interlaboratory comparability. As part of the US EPAs Watershed Manipulation Project, eight laboratories routinely measure chemical constituents of various field and laboratory‐derived solution samples. A quarterly interlaboratory comparison study has been designed by EPA quality assurance personnel in Corvallis, OR (USA) to assess: (1) ?nfralaboratory precision and bias, (2) inferlaboratory precision, and (3) trends through time. Synthetic solution samples are prepared quarterly and sent via overnight express to participating laboratories. For each analyte, laboratories are requested to perform analyses in triplicate with each replicate measured under different calibrations; precision calculated from resulting data therefore includes a component of among‐batch variability. Relative bias is calculated as the percent difference between a laboratory's mean and the median...
Databáze:	OpenAIRE
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