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本文研究借二甲酚橙和钪作为试剂,分光光度测定微量氟的方法,并报告本法的使用范围和可测度,适宜pH范围,以及数种共存离子的干扰。在pH 2.5—3.5之间,不同氟量引起试剂的颜色减褪遵循Beer定律。但随pH值之增加,灵敏度下降而可测范围扩大(pH 2.5—2.8相当氟量0—10微克;pH 3.0为0—15微克;pH 3.5为0—50微克)。如采用二甲酚橙和钪的混合试剂Ⅰ,可测定10毫升溶液中0.59—15微克氟,可测度为百万份之0.059。氯离子和硝酸根干扰不大。磷酸根、硫酸根、硅酸根、亚硫酸根、硫代硫酸根、亚硝酸根和硫氰酸根分别大于0.06,0.24,0.4,0.8,2.2,3.2和3.6毫克干扰严重(上列数据引起误差为5％),故应事先除去。
In this paper, xylenol orange and scandium as reagents, spectrophotometric determination of trace fluorine method, and report the use of the method and the measurable, suitable pH range, and several kinds of coexisting ions interference. At pH 2.5-3.5, different amounts of fluorine cause the color of the reagent to fade in accordance with Beer’s law. However, as the pH increases, the sensitivity decreases and the measurable range is broadened (0-10 μg equivalent to pH 2.5-2.8; 0-15 μg pH 3.0; 0-50 μg pH 3.5). For example, using mixed reagent I of xylenol orange and scandium, 0.59-15 micrograms of fluorine in 10 milliliters of solution can be measured as 0.059 in parts per million. Chloride and nitrate interference is not big. Phosphate, sulfate, silicate, sulfite, thiosulfate, nitrite and thiocyanate were more than 0.06,0.24,0.4,0.8,2.2,3.2 and 3.6 mg interference serious (the above data cause the error is 5%), it should be removed in advance.