CERTIFICATION REPORT The certification of the mass fraction of arsenobetaine in water: ERM®-AC626
This report describes the production of ERM-AC626, an aqueous solution material certified for the mass fraction of arsenobetaine (AB). The material was produced following ISO Guide 34:2009.
The starting material was 10 g of solid AB monohydrate. The purity of AB was assessed through measurements carried out by laboratories of demonstrated competence and within the scope of accreditation to ISO/IEC 17025:2005. An aqueous solution was prepared and ampouled into 2 mL amber glass ampoules under argon atmosphere.
Between unit-homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006. Due to the inherent homogeneity of water solutions, determination of minimum sample intake (within-unit homogeneity) was not required. The sample intake used in the homogeneity study was adopted as the recommended minimum sample intake. The minimum sample intake is 50 µg.
The certified value was obtained from the gravimetric preparation of the solution, taking into account the purity of the starting material. The certified value was confirmed by independent analyses carried out by laboratories of demonstrated competence and adhering to ISO/IEC 17025.
Uncertainties of the certified values were calculated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM) and include uncertainties related to possible inhomogeneity and instability and to characterisation.
The material is intended to be used as a calibrant and quality control sample. The CRM is available in amber glass ampoules containing 1 mL of AB aqueous solution closed under argon atmosphere. The minimum amount of sample to be used is 50 µg.
The CRM was accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.
KOLEVA Boryana;
BOERTZ Jens;
VAN BRITSOM Geert;
HELD Andrea;
2017-08-01
Publications Office of the European Union
JRC107216
978-92-79-70177-1,
1831-9424,
EUR 28669 EN,
OP KJ-NA-28669-EN-N,
https://publications.jrc.ec.europa.eu/repository/handle/JRC107216,
10.2760/232747,
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