降水中微量フッ化物イオンの直接光度定量法

概要

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A simple and direct method for the spectrophotometric determination of trace amounts of fluoride in rain waters using a commercially available reagent, "Alfusone (DOJINDO)", has been developed. In order to increase the sensitivity in the determination of fluoride in water samples, a 5-cm glass cell was used for spectrophotometric measurements instead of a 1-cm glass cell, which was used in conventional methods. The adsorbances of the reagent blank in the 5-cm cell increased in proportion to the concentration of Alfusone in a coloring solution. As an optimal coloring solution, a 1% Alfusone solution was adopted. The other optimum conditions, such as the standing time for color development and the effect of other ions, were also examined. The determination range was 10〜500μg/l of fluoride by using 25 or 10 ml of a water sample. The established method was successfully applied to the determination of fluoride in rain water samples as well as fresh river and ground water samples.
社団法人日本分析化学会の論文
2003-06-05