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Estimation of measurement uncertainty by the budget approach for heavy metal content in soils under different land use

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Abstract

A reference database was used for the estimation of the standard uncertainties resulting from sampling, sample preparation, and analysis of soil samples from a target area in Switzerland. This evaluation was based on an extended reference sampling of the Comparative Evaluation of European Methods for Sampling and Sample Preparation of Soils Project. Samples were taken according to the national sampling protocols of 15 European countries and were analyzed for zinc, cadmium, copper, and lead. The combined uncertainty for all laboratories was estimated according to the ISO Guide to the Expression of Uncertainty in Measurement. It was found that the sampling uncertainty was not larger than the analytical uncertainty if more than ten sample increments were taken. The uncertainty due to variation in sampling depth and sample size reduction was only significant under unfavorable conditions. On the basis of an uncertainty budget the sampling protocols can be optimized and a ranking is possible, aimed at conditions that are fit for the specific purpose.

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Authors and Affiliations

  1. Department of Nutrition and Food Quality, University of Applied Sciences, Marquardstraße 35, 36039, Fulda, Germany

    Ulrich Kurfürst

  2. Swiss Federal Research Station for Agroecology and Agriculture, Reckenholzstraße 191, 8046, Zürich, Switzerland

    André Desaules

  3. Berne, Switzerland

    Albert Rehnert

  4. Sassari University, Italy

    Herbert Muntau

Authors
  1. Ulrich Kurfürst
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  2. André Desaules
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  3. Albert Rehnert
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  4. Herbert Muntau
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Correspondence to Ulrich Kurfürst.

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Kurfürst, U., Desaules, A., Rehnert, A. et al. Estimation of measurement uncertainty by the budget approach for heavy metal content in soils under different land use. Accred Qual Assur 9, 64–75 (2004). https://doi.org/10.1007/s00769-003-0697-6

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  • DOI: https://doi.org/10.1007/s00769-003-0697-6

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