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Some aspects of the evaluation of environmental reference samples-A look at the material homogeneity and statistical approaches for collaborative tests

Über die Bewertung von Standardproben für die Umweltanalyse

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Summary

Collaborative tests for the evaluation of environmental SRMs frequently show poor uniformity. Two major problems not directly connected with the technical difficulties of the individual analytical procedure arise, namely

  1. (1)

    the estimation of the uniformity of the material and the sampling error and

  2. (2)

    the proper statistical treatment of the round-robin results to extract the best overall mean.

Approaches to both problems are discussed and examplified by the evaluation of three candidate SRMs for environmental samples.

Zusammenfassung

Bei der Planung von Ringversuchen zur Bereitstellung von Standardproben für uneinheitlich zusammengesetzte, feste Matrices, wie sie bei Umweltproben häufig auftreten, gibt es zwei spezielle Problemkreise, die nicht direkt die technischen Schwierigkeiten der chemischen Analyse von Einzelbestandteilen betreffen:

  1. 1.

    die Abschätzung der Probenhomogenität bzw. des Probenahmefehlers und

  2. 2.

    die einwandfreie statistische Auswertung der Laborergebnisse zur Ermittlung des bestmöglichen „wahren Wertes“.

Mögliche Lösungsvorschläge für diese beiden Teilaspekte werden anhand dreier Staub-Standardproben in Form von Einzelbeispielen diskutiert.

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  1. Institut für analytische Chemie der Technischen Universität, Vienna, Austria

    Gerhard Frauerwieser

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  1. Gerhard Frauerwieser
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Frauerwieser, G. Some aspects of the evaluation of environmental reference samples-A look at the material homogeneity and statistical approaches for collaborative tests. Mikrochim Acta 78, 55–66 (1982). https://doi.org/10.1007/BF01206690

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  • DOI: https://doi.org/10.1007/BF01206690

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