|
水道水中のナトリウムの分析に関する外部精度管理
|
|
小杉有希1、栃本博1、富士栄聡子1、保坂三継2、矢口久美子1
|
|
東京都健康安全研究センター、1環境保健部水質・環境研究科、2微生物部病原細菌研究科
|
External Quality Control Program on Analysis of Sodium in Drinking Water
Yuki KOSUGI1、Hiroshi TOCHIMOTO1、Satoko FUJIE1、
Mitsugu HOSAKA2 and Kumiko YAGUCHI1
Tokyo Metropolitan Institute of Public Health
The Tokyo Metropolitan Government has conducted an external quality control program for drinking water laboratories since 2003 in order to evaluate and improve their analytical performances. In 2006 30 laboratories participated in the program and the three analytical methods were applied using sodium as a standard sample; namely atomic absorption (AA) inductively coupled plasma spectrometry (ICP) and ion chromatography. There were no significant differences among the outcome of these 3 methods. As a result 3 laboratories were revealed to perform the analysis with poor accuracy because their absolute values of Z-scores were more than 3 while coefficients of variation were more than 10%. On the other hand in the case of the axial-viewing ICP luminous intensities of sodium were increased in laboratories using standard calibration solutions containing alkaline metals such as lithium which gave results lower than reference concentrations. Although some other unsatisfactory performances of laboratories were also observed they were due to simple errors such as the use of inadequate calibration curves and the unstable settings of instruments.
|
| Keywords: |
ナトリウム , 外部精度管理 , 誘導結合プラズマ発光分光分析法 , イオン干渉 , |
|
|
[PDF (260.3K)]
|
|
第5巻 , 第1号 , (pp.46-54)
