| Alternative title | ROCA-1 : Matériau de référence certifié de poudre de cacao pour les métaux traces et le delta isotopique du carbone |
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| DOI | Resolve DOI: https://doi.org/10.4224/crm.2026.roca-1 |
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| Author | Search for: Nadeau, Kenny1; Search for: LeBlanc, Kelly1ORCID identifier: https://orcid.org/0000-0001-6544-5850; Search for: Palmer, Calvin1; Search for: Chartrand, Michelle M.G.1ORCID identifier: https://orcid.org/0000-0003-3398-7246; Search for: Bordash, Mitchell1; Search for: Yang, Lu1ORCID identifier: https://orcid.org/0000-0002-6896-8603; Search for: Pagliano, Enea1ORCID identifier: https://orcid.org/0000-0001-9755-8737; Search for: Meija, Juris1ORCID identifier: https://orcid.org/0000-0002-3349-5535; Search for: Grinberg, Patricia1ORCID identifier: https://orcid.org/0000-0002-1167-6474 |
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| Affiliation | - National Research Council Canada
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| Format | 3D, Material |
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| Material type | Matrix material |
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| Subject | Canadian reference material; ROCA-1; mercury; lead; cadmium; arsenic |
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| Abstract | ROCA-1 is a cacao powder Certified Reference Material (CRM) produced by the National Research Council of Canada (NRC) with values on toxic elements and carbon isotope delta. Each unit of ROCA-1 consists of approximately fifteen (15) grams of homogenized cacao powder packaged in an amber glass vial and sealed within a trilaminate foil pouch. This material is primarily intended for use in method development, validation, and quality control for the determination of toxic elements (arsenic, cadmium, lead and mercury) and carbon isotope delta in cacao powder and similar matrices. |
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| Analytes | | Analyte | Quantity | Value | Expanded uncertainty | Unit | Type |
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| arsenic | mass fraction | 0.022 | 0.004 | mg/kg | certified | | cadmium | mass fraction | 0.137 | 0.014 | mg/kg | certified | | lead | mass fraction | 0.084 | 0.010 | mg/kg | certified | | mercury | mass fraction | 0.0039 | 0.0006 | mg/kg | reference | | ¹³C/¹²C | isotope delta vs VPDB-LSVEC | -30.50 | 0.06 | permille | certified | | ¹³C/¹²C | isotope delta vs VPDB | -30.37 | 0.06 | permille | certified |
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| Period of validity | - Valid from 2026-09-14 until 2030-02-28
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| Storage conditions | |
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| Date published | 2026-09-14 |
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| Publisher | National Research Council Canada |
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| Copyright statement | - © 2026 National Research Council Canada
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| References | View items (9)- Camin, Federica, Dinka Besic, Paul J. Brewer, et al. ‘Stable Isotope Reference Materials and Scale Definitions—Outcomes of the 2024 IAEA Experts Meeting.’ Rapid Communications in Mass Spectrometry 39, no. 14 (2025). Portico. https://doi.org/10.1002/rcm.10018.
- , ed. Evaluation of Measurement Data — Guide to the Expression of Uncertainty in Measurement. 2008. https://doi.org/10.59161/jcgm100-2008e.
- Pagliano, Enea, Kenny Nadeau, Lu Yang, Patricia Grinberg, and Juris Meija. ‘Accurate Measurements of Lead Using Isotope Dilution Calibration Curve Method with the Accounting for Natural Isotopic Variations.’ Analytica Chimica Acta 1408 (July 2026): 345550. https://doi.org/10.1016/j.aca.2026.345550.
- Grinberg, Patricia, Kenny Nadeau, Kelly LeBlanc, et al. SIM.QM-S18: Natural Toxic Elements (Cd, Pb) in Cacao Powder. Edited by . Bureau International des Poids et Mesures, 2026. https://doi.org/10.59161/clpd8240.
- CIPM Decision 104-26 – Traceability exception related to delta value isotope ratio measurements (12 March 2026). https://www.bipm.org/documents/20126/34439501/CIPM2015-I-EN.pdf/58ff6e3f-47f5-a230-4194-e2a23667e6da.
- Brand, Willi A., Tyler B. Coplen, Jochen Vogl, Martin Rosner, and Thomas Prohaska. ‘Assessment of International Reference Materials for Isotope-Ratio Analysis (IUPAC Technical Report).’ Pure and Applied Chemistry 86, no. 3 (2014): 425–67. https://doi.org/10.1515/pac-2013-1023.
- Chartrand, Michelle M. G., Lu Yang, Brad Methven, et al. ‘Characterization of Trace Element Impurities and Carbon Isotope Delta in HIPC-1, a High-Purity Graphite Certified Reference Material.’ Analytical and Bioanalytical Chemistry 418, no. 11 (2026): 3263–69. https://doi.org/10.1007/s00216-026-06428-y.
- van der Veen, Adriaan M. H. ‘Bayesian Analysis of Homogeneity Studies in the Production of Reference Materials.’ Accreditation and Quality Assurance 22, no. 6 (2017): 307–19. https://doi.org/10.1007/s00769-017-1292-6.
- Possolo, Antonio, and Juris Meija. Measurement Uncertainty: A Reintroduction. Version 2nd edition. With National Institute of Standards and Technology and National Research Council Canada . Sistema Interamericano de Metrologia, 2022. https://doi.org/10.4224/1TQZ-B038.
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| Export citation | Export as RIS |
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| Collection | Canadian Reference Materials and Methods |
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| Record identifier | b2f47a10-8188-44b9-959e-1b9a23b2aede |
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| Record created | 2026-09-25 |
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| Record modified | 2026-09-28 |
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