Michal Máriássy et al 2008 Metrologia 45 08015 doi:10.1088/0026-1394/45/1A/08015
Michal Máriássy1, Akiharu Hioki2, Leonid A Konopelko3, Irina Dimchoglo3, Michael Winchester4, Therese Butler4, Ryan Case4, Ana Hernández5, Ariel Galli5, Pablo Alvarez5, Joung Hae Lee6, Chantal Royer7, Naijie Shi8, Jingbo Chao8, Bing Wu8 and Haifeng Li8
Show affiliationsIn this key comparison anion calibration solutions of nitrate and nitrite were investigated. The mass fractions of the anions in both solutions were about 1 g/kg. For the nitrate comparison 8 participants provided results; 3 analytical techniques were used: ion chromatography, capillary electrophoresis and coulometry after ion exchange. The nitrite amount content was determined by 7 participants using one of the following 3 techniques: ion chromatography, titrimetry and capillary electrophoresis.
The following institutes participated in this key comparison: INTI (Argentina), KRISS (Korea), LNE (France), NIM (Pepole's Republic of China), NIST (USA), NMIJ (Japan), SMU (Slovakia) and VNIIM (Russia).
The variability (RSD) of the results is about 0.75% for both the nitrite and the nitrate solutions. Compared to the key comparison CCQM-K29 the results of CCQM-K59 were significantly worse. This is in part due to the measurement methods used, possibly also due to the standards used by the institutes.
A pilot study (P89) was performed in parallel on the same calibration solutions used in this K59 comparison study by laboratories preferring to participate in the pilot study and on a seawater sample containing about 0.1 mg/kg nitrite and 1 mg/kg nitrate. The results of the pilot study are reported separately.
Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
Issue 1A ( 1 January 2008)
Michal Máriássy et al 2008 Metrologia 45 08015
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