本方法通过控制温度在高氯酸存在下将氟蒸馏而与样品分离,用自动电位滴定仪以硝酸镧溶液滴定蒸馏液中的氟。进行了六次甲基四胺缓冲溶液的试验,考察了滴定条件和蒸馏条件的影响,确定了适合的试验条件。采用此方法其测量对象为氟,直接反映了萤石样品中的氟量,测量精度较好,可用于日常分析。 The present method separates the sample from the sample by controlling the temperature in the presence of perchloric acid and titrating the fluorine in the distillate with an automatic potentiometric titrator using a lanthanum nitrate solution. Six tests of methyltetramine buffer solution were carried out. The effects of titration conditions and distillation conditions were investigated. The suitable test conditions were determined. In this method, the object of measurement is fluorine, which directly reflects the amount of fluorine in the fluorite sample. The measurement accuracy is good and can be used for routine analysis.