Research Project code：0250005025
Update date：Dec. 17, 2001
The results of external quality control of water analysis in Gunma prefecture (1998)
1999 - 1999
Based on "Management Plan for Tap Water Quality in Gunma Prefecture", the accuracy management was implemented. In fiscal 1999, 13 organizations were participated, and chloride and arsenic ions were the subjected items. As the result, for chloride ions, entire coefficient of variation was 8.0% with no organization having a coefficient of variation of 10% or more. There was not significant difference among the test methods. For arsenic ions, intra coefficient of variation was excess 10% in one of 12 organizations. The entire coefficient of variation is slightly high 22.3%. No significant difference was observed among the test methods, but significant difference was observed between ICP and flameless atomic absorption spectroscopy for variance ratio.
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