Anderson D L, Cunningham W C
US Food and Drug Administration, Elemental Research Branch, Washington, DC 20204, USA.
J AOAC Int. 2000 Sep-Oct;83(5):1121-34.
Multiple units of Standard Reference Materials (SRMs) 1566 Oyster Tissue, 1567 Wheat Flour, 1568 Rice Flour, and 1570 Trace Elements in Spinach, produced by the National Institute of Standards and Technology (NIST, then the National Bureau of Standards), were analyzed 17-20 years after the original certification dates and 12-15 years after the certificates became invalid. Instrumental neutron activation analysis and thermal neutron prompt gamma-ray activation analysis were used to measure mass fractions for 27 elements in these SRMs to revalidate them for use in quality assurance (QA) programs required for food analysis programs within the U.S. Food and Drug Administration. With the exception of Se in SRM 1567, all element mass fractions were in agreement with certified values and literature data. Some evidence of B loss from SRM 1568 was observed. These materials were judged to be suitable for continued use in QA programs. Findings showed that these matrixes exhibited stability of moisture, mass fraction, and weight basis for far longer (> or =15 years) than was indicated by the 5-year validity statement on the NIST Certificates of Analysis.
美国国家标准与技术研究院（当时的国家标准局）生产的多个标准参考物质（SRM）单元，即1566号牡蛎组织、1567号小麦粉、1568号米粉和1570号菠菜中的微量元素，在原始认证日期后的17 - 20年以及证书失效后的12 - 15年进行了分析。采用仪器中子活化分析和热中子瞬发伽马射线活化分析来测量这些标准参考物质中27种元素的质量分数，以便重新验证它们在美国食品药品监督管理局食品分析项目所需的质量保证（QA）计划中的适用性。除了1567号标准参考物质中的硒元素外，所有元素的质量分数均与认证值和文献数据一致。观察到1568号标准参考物质中有硼损失的一些迹象。这些物质被判定适合在质量保证计划中继续使用。研究结果表明，这些基体在水分、质量分数和重量基准方面表现出的稳定性远远超过（≥15年）美国国家标准与技术研究院分析证书上5年有效期声明所表明的时间。
