第1回身近な水環境の全国一斉調査の調査方法とその結果の検討

概要

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The first nationwide simultaneous survey of familiar water environments was conducted on June 6, 2004, the standard measurement day. There were 2,545 survey points and 531 groups of participants (approximately 4,000 people), mainly volunteers. The survey items were atmospheric temperature, water temperature, and chemical oxygen demand (COD). The COD measurement used a commercial water quality test kit for samples with a relatively low COD (COD(D)), and was standardized using an original manual and common tools to improve the measurement precision of simple water analysis. The number of COD(D) measurements was set at three per sample. The three measurements performed at 90% of all the survey points showed a good agreement of 94%. It was observed that the frequency of the measurements differed between those that were indicated and not indicated by the standard colors of the test kit used. The COD(D) value that is the median of the three measurements for each sample, was assumed to represent the COD(D) of the survey point. The mean of the statistical ranges of the three measurements, which was derived for each COD(D) value, distributed with a peak at 6 mgO · l-1. When the range was large, the use of the median was effective in rejecting outliers.
社団法人　日本水環境学会の論文
2006-05-10