Groundwater in Okayama Prefecture.
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概要
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Groundwater contamination with hazardous substances such as trichloroethylene, tetrachloroethylene and others have disputed until now. The water Pollution Prevention ACT was revised in June, 1989 (the first year of Heisei) . It has been obliged and started to always exercise surveillance of groundwater from the 1989 fiscal year. It was executed to measure water quality at three hundred fifteen points in Okayama prefecture from the 1989 till the 1994 fiscal year. (30 points; the 1989 fiscal year, 285 points; from the 1989 fiscal year through the 1994 fiscal year.) Forty points were investigated in the 1995 fiscal year in the same way in Okayama Prefectural Institute for Environmental Science and Public Health. The measurement of NO<SUB>3</SUB>-N executed in seventy-two points in Okayama Prefectural Institute for Environmental Science and Public Health in the 1994-1995 fiscal year. The point of measurement was selected in all area in Okayama Prefecture and the points that is densely populated and make use of ground water frequently were selected preferentially. We measured all items as undermentioned in the area of many factories and places of business in Okayama city and Kurashiki city and the environs of a city area. Accoding to the data for the last seven years hazardous substances were not detected and the value of measurement was lower than the estimated standards as provided by the Environmental Agency. The result of measurements was no matter regionally and pointedly. These doesn't produce injurious results. NO<SUB>3</SUB>-N concentration was 0.1-3.4mg/<I>l</I> (the 1994 fiscal year) and 0.2-3.7mg/<I>l</I> (the 1995 fiscal year) and far lower than the drinking water standards (10mg/<I>l</I>) .NO<SUB>3</SUB>-N is concerned in the source of life what is the food production and waste matters treatment. We should provide for the future the way agriculture and lifestyle should adopt. We must take this matter into account seriously.
- 日本水処理生物学会の論文
日本水処理生物学会 | 論文
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