Proficiency test in Japan for the elements in tea-leaf powder
- 作者：Yanbei Zhu ; yb-zhu@aist.go.jp ; Takayoshi Kuroiwa ; Tomohiro Narukawa ; Kazumi Inagaki ; Koichi Chiba
- 关键词：Certified value ; Co-analysis ; Element ; Food sample ; National metrology institute ; Proficiency test (PT) ; Reference material ; Reference value ; Tea-leaf powder ; Trace
- 刊名：TrAC Trends in Analytical Chemistry
- 出版年：2012
- 期刊代码：111_01659936
- 类别：ch
- 出版时间：April, 2012
- 卷：34
- 期：Complete
- 页码：152-160
- 文件大小：424 K
摘要
The National Metrology Institute of Japan (NMIJ) started a series of proficiency test (PT) projects, science 2009, to improve the ability to analyze the elements in environmental and food samples. The first PT was carried out for determination of selected elements (i.e. Al, Ca, Fe, K, P, and Zn) in tea-leaf powder, where a candidate reference material for trace elements in tea-leaf powder was used as the PT material. In the first PT, 41 participants registered, 38 of whom submitted 39 sets of reports. Three national metrology institutes - National Metrology Institute of China, Korea Research Institute of Standards and Science and NMIJ - carried out a co-analysis of the candidate material in parallel with the PT. Certified values, characterized based on independent measurement by NMIJ, were confirmed by the results of co-analysis and were applied as the reference values to evaluate the reported results.