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关于氟的比色測定法,文献上已有綜合性的評論。其中最常用的有鋯—茜素磺酸法和釷—茜素磺酸法。按釷-二甲酚橙絡合物在pH 2.5—3.5的緩冲溶液中呈紅色,当有氟离子存在时也能发生減色作用,有定量关系。因此,作者拟訂釷-二甲酚橙法来作氟离子的此色測定。根据作者的試驗,釷(Ⅳ)与二甲酚橙在pH3的緩冲溶液中生成紅色溶液,經过分光光度計測定,釷-二甲酚橙溶液的最大吸收波峯在560mμ附近,当加入一定量的氟离子減色后,其最大吸收波峯仍然不改变(图1)。其显色条件如試剂的浓度及用量、pH影响、时間影响、干扰离子,作者等在另一文中已有所报导。
For the fluorine colorimetric assay, a comprehensive review has been made in the literature. Among them, zirconium-alizarin sulfonic acid and thorium-alizarin sulfonic acid are most commonly used. Press thorium - xylenol orange complex in pH 2.5-3.5 buffer solution was red, when the presence of fluoride ions can also occur discoloration, a quantitative relationship. Therefore, the author prepared thorium-xylenol orange method for fluoride ion color determination. According to the author’s test, thorium (Ⅳ) and xylenol orange in pH3 buffer solution generated a red solution, measured by a spectrophotometer, thorium-xylenol orange solution maximum absorption peak near 560mμ, when adding a certain The amount of fluoride ion color, the maximum absorption peak still does not change (Figure 1). Its color development conditions such as reagent concentration and amount, pH effect, time effect, interfering ions, etc. have been reported in another article.