四国地方水道水の水質解析評価(若手研究者の初論文特集)

概要

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Tap water samples on Shikoku Island were analyzed and evaluated with regard to their water quality. They were generally soft water with a pH value of 6.5〜8.0 and a COD value of 0.01〜1.08mg/L. Ammonium ion was not detected. Especially, the tap water samples from Tokushima and Kochi prefectures were clean with a low COD value of 0.02〜0.51mg/L. The classification of water type was performed for all tap water samples with the trilinear diagram method, finding 71.3% of tap water samples to be the typical ground water type (alkaline earth hydrogencarbonate). On the other hand, the hydrothermal/fossil water type (alkaline earth nonhydrogencarbonate) was 39.1% in north Shikoku (Kagawa, Ehime), while 14.6% in south Shikoku (Tokushima, Kochi). It is considered that the difference is due to the geological property by the median tectonic line between north and south Shikoku Island. The water qualities were as follows, respectively Kagawa : hardness, 23.5〜132.9mg/L; pH, 6.8〜7.9; COD, 0.20〜1.08mg/L, Tokushima : hardness, 14.6〜72.0mg/L; pH, 6.6〜8.0; COD, 0.02〜0.37mg/L, Kochi : hardness, 16.7〜66.5mg/L; pH, 6.5〜7.9; COD, 0.03〜0.51mg/L, Ehime : hardness, 17.8〜114.4 mg/L; pH, 6.7〜7.9; COD, 0.01〜0.61mg/L.
社団法人日本分析化学会の論文
2007-09-05