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氟离子选择电极法测定含铝样品中氟的报道较多,而含钙试样中氟的测定虽有报道,但对钙存在时氟的响应研究不多。采用草酸盐沉淀分离,虽有较好的效果,但甚感麻烦;加 EDTA 掩蔽钙,会使氟电极响应迟钝,同时,对柠檬酸掩蔽铝不利。本文对钙的影响进行了试验,当测定试样含氟量高时,钙的影响就显著,必须消除其影响,采用阳离子交换树脂分离,可得到较好的结果。
Fluoride ion-selective electrode method for the determination of fluoride in aluminum-bearing samples reported more, while the determination of fluoride in calcium-containing samples have been reported, but there is little research on the presence of calcium fluorine response. Using oxalate precipitation separation, although better results, but very troublesome; plus EDTA masking calcium, fluoride electrode will make the response slow, at the same time, citric acid masking aluminum disadvantage. In this paper, the effect of calcium has been tested. When the content of fluoride in the test sample is high, the effect of calcium is significant. The effect of calcium must be eliminated. The cation exchange resin is used to separate and obtain good results.