Lee Jong Wha, Lim Myung Chul, Lim Youngran, Tegegn Gizachew Betru, Lee Kyoung-Seok
Inorganic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea.
Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
Anal Bioanal Chem. 2024 Jan;416(2):475-486. doi: 10.1007/s00216-023-05051-5. Epub 2023 Nov 24.
The development of a novel coffee bean matrix certified reference material (CRM) for elemental analysis is described. The CRM was prepared by processing green coffee beans into a dry homogeneous powder. Mass fractions of elements in the CRM were measured using double isotope dilution inductively coupled plasma mass spectrometry (double ID-ICP-MS), and measurement results for eight elements (Mg, Ca, Fe, Cu, Zn, Cd, Hg, and Pb) of sufficient quality were certified. The mass fraction range was from 0.09476 mg/kg (Cd) to 1908 mg/kg (Mg), with relative expanded uncertainty range of 0.66% (Cd) to 12% (Pb). Measurement results of two elements (Cr and Ni) with insufficient quality were provided for information only. During characterization, an effective approach for the measurement of isotopic abundances and molar masses of elements with high natural isotopic variations for double ID-ICP-MS was developed and applied. The CRM developed in the present study is expected to be a useful measurement standard for assuring the quality of measurement procedures for coffee beans or related materials.
本文描述了一种用于元素分析的新型咖啡豆基质标准参考物质（CRM）的研制。该CRM是通过将生咖啡豆加工成干燥的均匀粉末制备而成。使用双同位素稀释电感耦合等离子体质谱法（双ID-ICP-MS）测定了CRM中各元素的质量分数，并对八种质量足够好的元素（Mg、Ca、Fe、Cu、Zn、Cd、Hg和Pb）的测量结果进行了认证。质量分数范围为0.09476 mg/kg（Cd）至1908 mg/kg（Mg），相对扩展不确定度范围为0.66%（Cd）至12%（Pb）。仅提供了质量不足的两种元素（Cr和Ni）的测量结果以供参考。在表征过程中，开发并应用了一种有效的方法来测量双ID-ICP-MS中具有高天然同位素变化的元素的同位素丰度和摩尔质量。本研究中研制的CRM有望成为确保咖啡豆或相关材料测量程序质量的有用测量标准。
