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Technical Reports of the Meteorological Research Institute

No. 58

2006 Inter-laboratory Comparison Study of a Reference Material for Nutrients in Seawater

M. Aoyama, J. Barwell-Clarke, S. Becker, M. Blum, Braga E. S., S. C. Coverly,
E. Czobik, I. Dahllof, M. H. Dai, G. O. Donnell, C. Engelke, G. C. Gong,
Gi-Hoon Hong, D. J. Hydes, M. M. Jin, H. Kasai, R. Kerouel, Y. Kiyomono,
M. Knockaert, N. Kress, K. A. Krogslund, M. Kumagai, S. Leterme,
Yarong Li, S. Masuda, T. Miyao, T. Moutin, A. Murata, N. Nagai,
G.Nausch, M. K. Ngirchechol, A. Nybakk, H. Ogawa, J. van Ooijen, H. Ota,
J. M. Pan, C. Payne, O. Pierre-Duplessix, M. Pujo-Pay, T. Raabe, K. Saito,
K. Sato, C. Schmidt, M. Schuett, T. M. Shammon, J. Sun, T. Tanhua,
L. White, E.M.S. Woodward, P. Worsfold, P. Yeats, T. Yoshimura,
A. Youenou, J. Z. Zhang


December 2008
DOI : 10.11483/mritechrepo.58

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PrefacePDF[1.06MB]

Abstract

Contents

List of Tables and Figures
1 IntroductionPDF[1.93MB]
2
Samples
2.1
Preparation of RMNS samples and timetable for the inter-laboratorycomparison study
2.2
Selection of determinands
2.3
Sample homogeneity
3
Participants and response
4
Statistical treatment
4.1
Raw means, medians, and standard deviations
4.2
Robust statistics
4.3
Consensus means, medians, and standard deviations
4.4
Calculation of Z-scores
5
Results
5.1
Ranked scatter plots of the results
5.2
Consensus medians, means, and standard deviations
5.3
Comparison between consensus standard deviations and homogeneities for sample #2
5.4
Analytical precisions and consensus standard deviations reported by the participating laboratories
5.5
Z-scores
6
Conclusions

Acknowledgements

References

Appendix I  List of participating laboratoriesPDF[2.81MB]

Appendix II  Results submitted by participating laboratories

Appendix III  Scatter plots and histograms of the results

Apendix IV  Documents

Appendix V  History of nutrient inter-laboratory comparison study