This report describes the production of ERM®-EB075A, B and C, a pure coppermaterial with added impurities certified for the mass fraction of Ag, Al, As, Au, Be, Bi, Cd, Co, Cr, Fe, In, Mg, Mn, Ni, P, Pb, S, Sb, Se, Si, Sn, Te, Ti, Zn and Zr. The material was produced following ISO Guide 34:2009 [ ].
Pure copper was melted with pure metal and alloy to obtain a pure copper material with added impurities. After casting, the material was processed by hot extrusion and cold machining to produce discs of 39 mm diameter (ERM-EB075A), cylinders of 8 mm diameter (ERM-EB075B) and chips of 250 mg (ERM-EB075C).
Between unit-homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006 [ ]. Within-unit homogeneity was quantified to determine the minimum sample intake.
The material was characterised by an intercomparison among laboratories of demonstrated competence and adhering to ISO/IEC 17025 [ ]. Technically invalid results were removed but no outlier was eliminated on statistical grounds only.
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 for the quality control and assessment of method performance. As any reference material, it can also be used for control charts or validation studies. The certified reference material (CRM) is available in three different formats:
- ERM-EB075A: disc of 39 mm diameter; 30 mm thick; packed in box
- ERM-EB075B: cylinder of 8 mm diameter; 100 mm length; sealed in plastic sachet under vacuum
- ERM-EB075C: bottle of 50 g of chips; chip weight 250 mg
The minimum sample intake of ERM-EB075A and B is suitable for GD-MS and spark-OES techniques. For ERM-EB075C, the minimum amount of sample to be used is 20 mg for As, Ni, Pb, Sb, Se, Sn, Te; 100 mg for Ag, Al, Be, Bi, Cd, Co, Cr, Hg, In, Mg, Mn, Sb, Se, Ti, W, Zr; 200 mg for Au, Be, Bi, Fe, Zn; 300 mg for sulphur and 500 mg for Si.
The CRM was accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.
BACQUART Thomas;
LINSINGER Thomas;
2015-06-16
Publications Office of the European Union
JRC92118
978-92-79-43261-3,
1831-9424,
EUR 26870,
OP LA-NA-26870-EN-N,
https://publications.jrc.ec.europa.eu/repository/handle/JRC92118,
10.2787/99079,
