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Characterization of NIES CRM No. 23 Tea Leaves II for the determination of multielements

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Abstract

A candidate environmental certified reference material (CRM) for the determination of multielements in tea leaves and materials of similar matrix, NIES CRM No. 23 Tea Leaves II, has been developed and characterized by the National Institute for Environmental Studies (NIES), Japan. The origin of the material was tea leaves, which were ground, sieved through a 106-µm mesh, homogenized, and then subdivided into amber glass bottles. The results of homogeneity and stability tests indicated that the material was sufficiently homogeneous and stable for use as a reference material. The property values of the material were statistically determined based on chemical analyses by a network of laboratories using a wide range of methods. Sixteen laboratories participated in the characterization, and nine certified values and five reference values were obtained. These property values of the candidate CRM, which are expressed as mass fractions, were close to the median and/or mean values of the mass fractions of elements in various tea products. The candidate CRM is appropriate for use in analytical quality control and in the evaluation of methods used in the analysis of tea and materials of similar matrix.

New NIES CRM No. 23 Tea Leaves II.

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Acknowledgments

The authors are very grateful to K. Miura and M. Okawa of the National Institute for Environmental Studies, Japan, for preparing and analyzing the material. We thank N. Furuta of Chuo University, Japan, S. Hirai of Tokyo City University, Japan, and T. Uchida of Nagoya Institute of Technology, Japan, for help with the chemical analyses.

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Authors and Affiliations

  1. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan

    Ikuko Mori, Miyuki Ukachi, Kimiyo Nagano, Hiroyasu Ito & Masataka Nishikawa

  2. University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8563, Japan

    Jun Yoshinaga

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  1. Ikuko Mori
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  2. Miyuki Ukachi
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  3. Kimiyo Nagano
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  4. Hiroyasu Ito
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  5. Jun Yoshinaga
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  6. Masataka Nishikawa
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Correspondence to Ikuko Mori.

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Mori, I., Ukachi, M., Nagano, K. et al. Characterization of NIES CRM No. 23 Tea Leaves II for the determination of multielements. Anal Bioanal Chem 397, 463–470 (2010). https://doi.org/10.1007/s00216-009-3290-y

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  • DOI: https://doi.org/10.1007/s00216-009-3290-y

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