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Smith曾用四苯氯化鉮(TPA)电位滴定BF_4~-,但因沉淀溶解度较大,必须在低温(2℃)滴定,操作不便。Selig提出氯代十六烷基吡啶(CPC)和十六烷基三甲基氯化铵(CETAC)作滴定剂,我们观察到过量F-有严重干扰。本文报导节基十四烷基二甲基氯化铵(BDTAC)可在F-介质中作为电位滴定BF_4~-的滴定剂,用于硼铁中高含量硼的测定,能获良好结果。
Smith used tetraphenylphosphonium chloride (TPA) to potentiometrically titrate BF_4 ~ -, but due to the large solubility of the precipitate, it must be titrated at low temperature (2 ℃), and the operation is inconvenient. Selig proposed chlorination of cetylpyridinium chloride (CPC) and cetyltrimethylammonium chloride (CETAC) as titrants, and we observed that there was a serious interference with excess F-. In this paper, we report that tetradecyldimethylammonium chloride (BDTAC) can be used as a titration reagent for titration of BF_4 ~ - in F-media. It can be used in the determination of high content of boron in ferroboron and get good results.