北津軽郡の歯牙フッ素症発現地域における飲料水中フッ素濃度の変動について

概要

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This report describes the fluctuations in the fluoride concentration of water supplies obtained from deep wells (about 200-300 meters in depth) in Kitatsugaru area, where dental fluorosis is endemic. The fluoride contents of 11 water samples obtained monthly from each source were analyzed with a fluoride ion electrode. Of 23 deep wells, great variations were found at four sources (coefficient of variation: 22-37 percent). When the fluoride concentrations of 28 water samples, obtained daily from one of these four sources, were determined to check the effect of each sampling day, it was found that the variation of the fluoride concentration was daily and irregular. When analyzing the relationship between special tissues of a body and the fluoride content of drinking water, it is necessary to determine fluoride content at regular intervals, e. g. during a month or a year, in order to estimate adequately the mean value of fluoride content as well as to prevent errors resulting from a single fluoride determination.
有限責任中間法人日本口腔衛生学会の論文