Identification of possible technical problems in determination of the major inorganic constituents of brown-rice flour by evaluating proficiency test results

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• 作者：Shin-ichi Miyashita (1)
  Kazumi Inagaki (1)
  Shigehiro Naito (2)
  Kumiko Shindoh (2)
  Tomohiro Narukawa (1)
  Yanbei Zhu (1)
  Takayoshi Kuroiwa (1)
  Akiharu Hioki (1)
  Toshiyuki Fujimoto (1)
  Koichi Chiba (1)
  
• 关键词：Brown ; rice flour ; ISO/IEC 17043 ; international harmonized protocol ; proficiency test ; E n ; number ; z ; score
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：405
• 期：25
• 页码：8347-8362
• 全文大小：1465KB
• 参考文献：1. International Organization for Standardization (2010) ISO/IEC 17043:2010 Conformity assessment鈥擥eneral requirements for proficiency testing. ISO, Geneva, Switzerland
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• 作者单位：Shin-ichi Miyashita (1)
  Kazumi Inagaki (1)
  Shigehiro Naito (2)
  Kumiko Shindoh (2)
  Tomohiro Narukawa (1)
  Yanbei Zhu (1)
  Takayoshi Kuroiwa (1)
  Akiharu Hioki (1)
  Toshiyuki Fujimoto (1)
  Koichi Chiba (1)
  
  1. Environmental Standards Section, National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan
  2. National Food Research Institute (NFRI), National Agriculture and Food Research Organization (NARO), 2-1-12 Kannondai, Tsukuba, Ibaraki, 305-8642, Japan
  
• ISSN：1618-2650

文摘

To support skill upgrading in analysis of inorganic constituents of environmental and food samples, the National Metrology Institute of Japan (NMIJ) and the National Food Research Institute (NFRI) have organized a proficiency test (PT) of determination of Mn, Fe, Cu, Zn, As, and Cd in brown-rice flour based on the international standard (ISO/IEC 17043:2010). One hundred and thirty-three sets of reports were assessed by use of the E n -number and z-score approaches in accordance with ISO/IEC 17043 and the international harmonized protocol for PT. The PT results and analytical procedures, reported in detail, were reviewed, and possible technical reasons for questionable or unsatisfactory results are discussed. Distribution of reported values for cadmium in the test material according to the measurement methods used. The mean values reported with standard deviations (error bars) are given in the order of lower to higher values. Solid lines indicate the expanded uncertainty (coverage factor k = 2) of assigned value.