Assessment of Four Inter-Comparison Exercises in Organic Elemental Analysis

We evaluate the uncertainty in organic elemental analysis of C, H, N, and S. We use data from six proficiency tests (PTs), in which some 35 Spanish laboratories participated. The uncertainty of the technique is estimated from the relative within-laboratory and between-laboratory variances for pure substances and samples with complex matrices (soil, powdered milk, oil, ash, and petroleum coke). We also calculate the relative standard uncertainties for individual laboratories when analysing pure substances using historical data from the participation of each laboratory in different editions of PTs. The uncertainty values obtained for the individual laboratories are comparable with the uncertainty of the technique and correlate with the combined z-scores. The evolution over time of those laboratories participating in common editions of PTs is also evaluated.

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Uncertainty estimation in organic elemental analysis using information from proficiency tests

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Sahuquillo

et al. 2008

Anal Bioanal Chem

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Comparison of “bottom-up” and “top-down” strategies for the estimation of the uncertainty in organic elemental analysis

et al. 2007

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Mat Control: a new laboratory for the preparation of reference materials at the University of Barcelona, Spain

Sahuquillo

Carrasco²,

Muntau³

et al. 2004

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Assessment of Four Inter-Comparison Exercises in Organic Elemental Analysis

Cited by 3 publications

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Uncertainty estimation in organic elemental analysis using information from proficiency tests

Uncertainty estimation in organic elemental analysis using information from proficiency tests

Comparison of “bottom-up” and “top-down” strategies for the estimation of the uncertainty in organic elemental analysis

Mat Control: a new laboratory for the preparation of reference materials at the University of Barcelona, Spain

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