Colección INTI-SNRD


Título: Key comparison CCQM-K59 : determination of nitrite and nitrate in calibration solutions. Final report
Fuente: Metrología, 45
Autor/es: Máriássy, Michal; Hioki, Akiharu; Konopelko, Leonid A.; Dimchoglo, Irina; Winchester, Michael; Butler, Therese; Case, Ryan; Hernández, Ana; Galli, Ariel; Alvarez, Pablo; Lee, Joung Hae; Royer, Chantal; Shi, Naijie; Chao, Jingbo; Wu, Bing; Li, Haifeng; Turk, Gregory
Materias: Metrología; Incertidumbre; Calibración; Nitritos; Nitratos; Soluciones; Aniones; Cromatografía
Editor/Edición: IOP Publishing; 2008
Licencia: https://creativecommons.org/licenses/by/3.0/
Afiliaciones: Máriássy, Michal. Slovak Institute of Metrology (SMU); Eslovaquia
Hioki, Akiharu. National Metrology Institute of Japan (NMIJ); Japón
Konopelko, Leonid A. D. I. Mendeleev Scientific and Research Institute for Metrology (VNIIM); Rusia
Hernández, Ana. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Lee, Joung Hae. Korea Research Institute of Standards and Science (KRISS); Corea del Sur
Royer, Chantal. Laboratoire National de Métrologie et d’Essais (LNE); Francia
Chao, Jingbo. National Research Center for Certified Reference Materials (NIM); China
Turk, Gregory. National Institute of Standards and Technology (NIST); Estados Unidos

Resumen: In 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 (P.R.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 comparisons 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.
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