CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Comparability of oceanic nutrient data: IOCCP-JAMSTEC 2015 Inter-laboratory calibration exercise of a certified reference material for nutrients in seawater
Autor/es:
MARA ABAD; MICHIO AOYAMA; MIRIAM SOLIS; CAROL ANSTEY
Lugar:
Qingdao
Reunión:
Congreso; Clivar- Open Science Conference; 2016
Resumen:
The objective of this inter-laboratory calibration exercise is to evaluate and improve comparability of the global nutrients data in the word ocean. IOCCP and JAMSTEC co-organized an inter-laboratory calibration exercise of nutrients in seawater using four lots of recently certified RM produced by KANSO and three CRMs provided by National Metrology Institute of Japan which are certified in March 2014. Results were returned from 59 laboratories in 28 countries. Korean Institute of Ocean Science and Technology, KIOST, also offered to provide their recently developed RMs to this I/C exercise. The Royal Netherlands Institute for Sea Research, NIOZ, also offers to provide silicate stock solution to contribute to the overall assessment of results regarding with the I/C exercise. The ranked concentration plots for a particular nutrient would be proportional and roughly parallel to each other for samples with different nutrient concentration if each laboratory appropriately compensated for the non-linearity of the calibration curves. However there are non-proportional results from some laboratories for all the determinants as well as observed in the previous  I/C studies. These results indicate that non-linearity of the calibration curves for nutrient analysis is one of significant sources of less comparability of nutrients data. It is clear that present comparability among the participants in 2015 I/C exercise is quite similar with previously obtained comparability in 2012 I/C study and previous I/C studies. Consensus standard deviations of all determinands are on order of magnitude larger rather than homogeneity of the CRMs distributed and consensus standard deviations are about double of reported precision of measurements of the laboratories. Therefore these I/C result show that use of CRM will be able to greatly improve comparability of nutrient data among the laboratories in the world.Ver lista completa de autores en el texto completo del trabajo.