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. All rights reserved, Elsevier.
Stability of sodium mass fraction in agricultural certified reference materials.
E. A. N. Fernandes, Nuclear Energy Center for Agriculture, University of Sao Paulo, Avenida Centenario 303, Piracicaba, Sao Paulo 13416-000, Brazil. E-mail firstname.lastname@example.org
Bacchi, M. A., Fernandes, E. A. N., Mazola, Y. T., Gonzaga, C. L.; Stability of sodium mass fraction in agricultural certified reference materials.. IFIS Food and Health Sciences Database 2023; doi:
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