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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
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	Preface	PDF[1.06MB]
	Abstract
	Contents
	List of Tables and Figures
1	Introduction	PDF[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 laboratories	PDF[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