Stability of sodium mass fraction in agricultural certified reference materials

• Published in: Talanta open Vol. 5; p. 100097
• Main Authors: Bacchi, M.A., Fernandes, E.A.N., Mazola, Y.T., Gonzaga, C.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2022; Elsevier
• Subjects: Contamination; Glass; Sodium migration; Standard reference material; Sodium migration; Contamination; Standard reference material; Glass
• ISSN: 2666-8319; 2666-8319
• DOI: 10.1016/j.talo.2022.100097

•Twenty-one years data series of SRM 1515 Apple Leaves analysis.•Increasing sodium mass fraction over time in SRM 1515 Apple Leaves and SRM 1547 Peach Leaves.•Migration of sodium from glass bottle walls into certified reference materials. Certified values in reference materials are considered the best estimates of true values, being used for validation and verification of analytical methods. A long-term series (1998 to 2019) of neutron activation analysis (NAA) of agricultural certified reference materials was investigated at the Radioisotopes Laboratory (CENA/USP). The average sodium mass fraction in SRM 1515 Apple Leaves and SRM 1547 Peach Leaves did not agree with the certified values and the discrepancy was confirmed by triple quadrupole inductively coupled plasma mass spectrometry (TQ-ICP-MS). Long-term data showed a clear increase of Na mass fraction over time. Such behavior, corroborated by results from other authors, seems to confirm the hypothesis of migration of Na from glass bottle walls into the certified reference materials. [Display omitted]