Abstract
Certified reference materials (CRMs) for water content with good accuracy and homogeneity are required for calibration or validation of the Karl Fischer titration and for establishing the traceability of water content results. Three such CRMs were produced and certified: GBW 13512, 13513 and 13514 are based on solvent mixtures consisting of butanol, xylene and propylene carbonate with water contents of 10.01, 1.067 and 0.139 mg/g, respectively, certified by the Karl Fischer coulometric and volumetric methods. These CRMs were prepared, dispensed and sealed under a humidity equal to the equilibrated humidity of their headspace. In this way, the between-bottle homogeneity uncertainty (u H,rel) could be kept as low as u H,rel = 0.12 % for GBW 13512. The certification methods, that is, Karl Fischer coulometric and volumetric methods, were calibrated using in-house water standards prepared by gravimetry. The results were traceable to the SI unit of mass. The relative deviation of the water contents between the two methods for GBW 13512 was only 0.05 %. The expanded uncertainty (U, k = 2) of three CRMs was 0.12, 0.024 and 0.012 mg/g, respectively. These CRMs for water content with good accuracy can be applied in the calibration or validation of measurement procedures to ensure accurate and comparable results.
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References
Le Goff T, Wood S (2008) Anal Bioanal Chem 391:2035–2045
Rückold S, Grobecker KH, Isengard HD (2001) Fresenius J Anal Chem 370:189–193
Sander LC, Bedner M, Tims MC, Yen JH, Duewer DL, Porter B, Christopher SJ, Day RD, Long SE, Molloy JL, Murphy KE, Lang BE, Lieberman R, Wood LJ, Payne MJ, Roman MC, Betz JM, NguyenPho A, Sharpless KE, Wise SA (2012) Anal Bioanal Chem 402:473–487
Yazgan S, Bernreuther A, Ulberth F, Isengard HD (2006) Food Chem 96:411–417
Corredor CC, Bu DS, Both D (2011) Anal Chim Acta 696:84–93
Isengard HD (2001) Food Control 12:395–400
Margolis SA, Hagwood C (2003) Anal Bioanal Chem 376:260–269
Margolis SA, Mele T (2001) Anal Chem 73:4787–4792
Margolis SA, Paulsen J, Park E (2002) Anal Bioanal Chem 374:1274–1281
Margolis SA, Vaishnav K, Sieber JR (2004) Anal Bioanal Chem 380:843–852
Margolis SA, Vaishnav K, Sieber JR (2004) Anal Bioanal Chem 380:556–562
Sturgeon RE, Lam JW, Windust A, Grinberg P, Zeisler R, Oflaz R, Paul RL, Lang BE, Fagan JA, Simard B, Kingston CT (2012) Anal Bioanal Chem 402:429–438
Carroll PA, Bell SA, Maxwell AS, Tomlins PE (2011) Int J Thermophys. doi:10.1007/s10765-011-0981-3
Scholz E (1984) Karl Fischer titration. Springer, Berlin
Margolis SA, Levenson M (2000) Fresenius J Anal Chem 367:1–7
Kato H, Fujimoto Y, Kakuda M (1992) Anal Sci 8:575–578
Wang HF, Ma K, Zhang W, Li J, Sun GH, Li HM (2011) Food Chem 134:2362–2366
Mortimer RG (2000) Physical chemistry, charpter 6 the thermodynamics of solution. Academic Press, San Diego, CA
Cedergren A, Jonsson S (2001) Anal Chem 73:5611–5615
International Organisation for Standardisation (ISO) (2006) ISO guide 35: reference materials—general and statistical principles for certification. ISO, Geneva
Redman-Furey N, Poiesz K, Miller J, Grundner C (2010) J Therm Anal Calorim 102:633–639
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This study was supported by the General Administration of Quality Supervision, Inspection and Quarantine (GAQSIQ) Public Benefit Research Foundation (Grant No. 21-AHY-0915).
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Wang, H., Ma, K., Zhang, W. et al. Production of three certified reference materials for water content based on mixed solutions of butanol, xylene and propylene carbonate. Accred Qual Assur 17, 589–596 (2012). https://doi.org/10.1007/s00769-012-0930-2
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DOI: https://doi.org/10.1007/s00769-012-0930-2