Becker D A
Center for Analytical Chemistry, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Biol Trace Elem Res. 1990 Jul-Dec;26-27:571-7. doi: 10.1007/BF02992713.
The NIST has produced and is in the process of certifying two new leaf CRMs, SRM1515 Apple Leaves and SRM 1547 Peach Leaves, as replacements for the no longer available NBS Orchard Leaves and the almost depleted Citrus Leaves. These two new materials have been processed and are being thoroughly evaluated and should provide the most advanced natural matrix botanical trace-element reference materials available. Caution should be used in determining a basis weight (drying) for these CRMs because of their very fine particle size. Homogeneity has been established by instrumental neutron activation analysis on both leaf materials for five elements, to date, to better than 1.5% (1 s) for 100-mg sample sizes.
美国国家标准与技术研究院（NIST）已经制备并正在对两种新的树叶标准物质进行认证，即SRM1515苹果叶和SRM 1547桃叶，以替代不再可用的美国国家标准局果园树叶和几乎耗尽的柑橘叶。这两种新材料已经经过处理，正在进行全面评估，应该会提供现有的最先进的天然基质植物微量元素标准物质。由于这些标准物质的颗粒非常细，因此在确定其基重（干燥）时应谨慎。到目前为止，通过仪器中子活化分析已确定两种树叶物质中五种元素的均匀性，对于100毫克的样品量，均匀性优于1.5%（1s）。
