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Estimation of measurement uncertainty in the determination of orthophosphates in seawater by continuous flow analysis (CFA)

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Abstract

Phosphorus is the second most important limiting nutrient for the growth of autotrophic organisms in coastal and oceanic environments and is present in a wide range of chemical forms both dissolved and particulate. Within the dissolved inorganic fraction of phosphorus, orthophosphates are the so-called soluble reactive phosphorus. This nutrient, as a central element in coastal and oceanic biogeochemical cycles, is one of the compounds measured for the physico-chemical quality indices established by the Water Framework Directive 2000/60/EC and one of the characteristics to be measured in the Marine Strategy Framework Directive 2008/56/EC. In this work, an estimation of the measurement uncertainty in the determination of orthophosphates in seawater by continuous flow analysis, based on ISO 15681-2:2003, in the range of 10–150 μg/L as P was carried out by means of a global model of uncertainty quantification from validation data. The results were coherent with previous interlaboratory comparisons of orthophosphates in seawater. Expanded uncertainty did not exceed 6.5 % in the entire range.

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Acknowledgments

This work was financed through a grant between the Environmental Hydraulics Institute of the Universidad de Cantabria (IH Cantabria) and the Regional Government of Cantabria through the Coastal Monitoring Network. The authors would also like to thank the reviewers for their helpful comments and the IHLab Bio staff for their help during the experiments.

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Authors and Affiliations

  1. IHLab Bio, Environmental Hydraulics Institute “IH Cantabria”, C/ Isabel Torres no 15, 39011, Santander, Spain

    Inigo Claramunt & Luisa Perez

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  1. Inigo Claramunt
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  2. Luisa Perez
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Correspondence to Luisa Perez.

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Claramunt, I., Perez, L. Estimation of measurement uncertainty in the determination of orthophosphates in seawater by continuous flow analysis (CFA). Accred Qual Assur 19, 205–212 (2014). https://doi.org/10.1007/s00769-014-1051-x

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  • DOI: https://doi.org/10.1007/s00769-014-1051-x

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