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人造冰晶石(Na_3AIF_6)是一种高熔点的难溶复盐。常压下,其熔点为1011℃,16℃时在水中的溶解度为0.35%。为了分析人造冰晶石中的氟,常用碱熔融法分解试样。大量的熔剂所含的离子进入试液,使分析氟的条件苛刻,步骤复杂。本工作采用氢式强酸性阳离子交换树脂(国产强酸732)交换吸附冰晶石中的Na~+和Al~(3+)并释出等当量H~+,用NaOH标准溶液滴定交换后形成的HF,借以测得冰晶石中氟的含量,方法简便,用碱熔融分解法平行对照试验的结果表明,本法不仅简单,而且结果的精度与经典分析方法的结果相当。
Artificial cryolite (Na_3AIF_6) is a kind of refractory complex salt with high melting point. At atmospheric pressure, the melting point is 1011 ° C and the solubility in water at 16 ° C is 0.35%. In order to analyze the artificial cryolite, alkali melting method is used to decompose the sample. Large amount of flux contained ions into the test solution, the harsh conditions for the analysis of fluorine, the steps are complicated. In this work, hydrogen-type strong acid cation exchange resin (domestic strong acid 732) was used to exchange Na ~ + and Al ~ (3+) in cryolite and release equivalent H ~ +. Titration of HF after titration with NaOH standard solution , In order to measure the content of fluorine in cryolite, and the method is simple. The results of parallel controlled experiments with alkali melting and decomposition show that the method is not only simple, but also the accuracy of the results is equivalent to that of classical analytical methods.