Key comparison CCQM-K59 : determination of nitrite and nitrate in calibration solutions. Final report

• Autores: Máriássy, M.; Hioki, A.; Konopelko, L. A.; Dimchoglo, I.; Winchester, M.; Butler, T.; Case, R.; Hernández, A.; Galli, A.; Álvarez, P.; Lee, J. H.; Royer, C.; Shi, N.; Chao, J.; Wu, B.; Li, H.; Turk, G.
• Año de publicación: 2008
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Metrología, 45
• Materia: Metrología; Incertidumbre; Calibración; Nitritos; Nitratos; Soluciones; Aniones; Cromatografía
• Institución: Instituto Nacional de Tecnología Industrial

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.
Fil: Máriássy, M. Slovak Institute of Metrology (SMU); Eslovaquia
Fil: Hioki, A. National Metrology Institute of Japan (NMIJ); Japón
Fil: Konopelko, L. A. D. I. Mendeleev Scientific and Research Institute for Metrology (VNIIM); Rusia
Fil: Hernández, A. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Fil: Lee, Joung H. Korea Research Institute of Standards and Science (KRISS); Corea del Sur
Fil: Royer, C. Laboratoire National de Métrologie et d’Essais (LNE); Francia
Fil: Chao, J. National Research Center for Certified Reference Materials (NIM); China
Fil: Turk, G. National Institute of Standards and Technology (NIST); Estados Unidos