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氟的化学性质活泼,能与多种金属离子形成稳定络合物或难溶化合物,因此分析时,一般须先使氟与干扰元素分离。过去所用分离方法中,硅氟酸挥发法比较受到重视,但该法的影响因素多,条件控制较严,加以操作烦难,应用上颇感不便。本文的目的,在于从萃取分离方面寻求一种效果好,回收率高,而又简便快速的分离微量氟的方法。在这方面莫菲特(Moffett)等曾简略地报导过应用四氯化碳萃取分离氟化四苯锑以测定较大量氟的方法,但未提到分离条件,亦未涉及在微量氟方面的应用。对此,本文进行了一些试验。
Fluorine chemical active, with a variety of metal ions to form a stable complex or insoluble compounds, so the analysis, the general must first make fluoride and interfering elements. In the separation method used in the past, silicofluoric acid volatilization method has received more attention, but the law of many factors, more stringent conditions to control, to operate difficult, quite inconvenient to use. The purpose of this paper is to find a method for the separation of trace fluorine from extraction and separation with a good effect and high recovery rate. In this regard, Moffett et al. Briefly reported the use of carbon tetrachloride for the extraction and separation of tetrabenzofuran to determine the greater amount of fluorine, but no mention was made of the separation conditions nor the trace fluorine application. In this regard, this paper conducted some experiments.