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Stability of the sodium content in selected botanical reference materials
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SYSNO ASEP 0501267 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Stability of the sodium content in selected botanical reference materials Author(s) Kameník, Jan (UJF-V) RID, ORCID, SAI
Kučera, Jan (UJF-V) RID, ORCID, SAI
Borovička, Jan (GLU-S) RID, SAI, ORCID
Havránek, Vladimír (UJF-V) RID, SAI, ORCIDNumber of authors 4 Source Title Sborník přednášek 7. ročníku Referenční materiály a mezilaboratorní porovnávání zkoušek, Analytical standards and equipment, 7. - Lednice : 2THETA, 2018 - ISBN 978-80-86380-98-8 Pages s. 65-71 Number of pages 7 s. Publication form Print - P Action Referenční materiály a mezilaboratorní porovnávání zkoušek VII. Event date 05.11.2018 - 07.11.2018 VEvent location Lednice Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords standard reference materials ; analysis ; methods Subject RIV CB - Analytical Chemistry, Separation OECD category Analytical chemistry Subject RIV - cooperation Institute of Geology - Geochemistry R&D Projects GBP108/12/G108 GA ČR - Czech Science Foundation (CSF) Institutional support UJF-V - RVO:61389005 ; GLU-S - RVO:67985831 Annotation Sodium mass fractions in NIST standard reference materials (SRM) SRM 1547 Peach Leaves and SRM 1515 Apple leaves determined by INAA in our laboratory in recent years has been higher than the certified values. Similarly, increased values were published for SRM 1547 by several other laboratories. The increased Na mass fractions was found also for freshly opened SRM 1547 bottle and for material originating from a different lab. Increased Na mass fractions were confirmed by ICP-MS analysis of both materials. Analysis of archived samples revealed that sodium mass fraction in materials stored in polyethylene capsules is in agreement with the certified values. The sodium content in the glass of SRM 1547 bottle was roughly 10 %. Direct measurement of the Na depth profile by micro-PIXE was not indicative whether Na is released, i.g., by a glass corrosion due to residual humidity in the botanical material. However, a model experiment with freshly prepared and pulverized peach leaves demonstrated that such a scenario is possible for leaf-based materials. Although the study was focused on two NIST materials, the process is possible for any material with rather low Na content. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2019
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