Journal
ACCREDITATION AND QUALITY ASSURANCE
Volume 14, Issue 2, Pages 87-93Publisher
SPRINGER
DOI: 10.1007/s00769-008-0484-5
Keywords
Measurement uncertainty; CRM; Metal; Soil
Funding
- POCI 2010
- European Social Fund [SFRH/BD/21597/2005]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/21597/2005] Funding Source: FCT
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In this work estimation of measurement uncertainties associated with the total metal content in soils was done by an intralaboratory approach based on method validation and quality control data, and using two certified reference materials (CRM). CRM and soil samples were analyzed following procedures based on the methods that are applied to silicate materials. All elements were determined by atomic absorption spectrometry following a quality assurance program previously established. Quality control actions were implemented in order to provide reliable data. The precision under within-laboratory reproducibility conditions was estimated from triplicate analysis. The trueness component was determined as recovery of the analyte from CRMs: soil sample, SO-2 and river clay sediment, LGC 6139. Combined measurement uncertainty was expressed in terms of precision and recovery uncertainties and the later further split on CRM replicate analysis and uncertainty of the certified value components. The results obtained are critically discussed on the basis of the different contributions. For the selection of the reference material, the CRM dependent terms are critically compared in order to fulfill specific requirements.
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