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本文试验了以铝-铬天青S(CAS)-溴化十六烷基三甲基铵(CTMAB)形成的三元蓝色络合物作为滴定法测定铝电解质中NaF/AlF_3比的终点指示,有较明显的颜色变化,且灵敏度高、结果准确。实验部份 (一)主要试剂 1.三氯化铝溶液(一级):将氯化铝(AlCl_3·6H_2O)13.4克溶解于水,稀释至1000毫升,摇匀。 2.CTMAB溶液:0.05%.称取0.05克CTMAB加水60毫升微热溶解,冷却,以水稀释至100毫升、摇匀。
In this paper, a ternary blue complex formed by aluminum-chromium azure S (CAS) -bromodimethylammonium bromide (CTMAB) was used as the endpoint indicator for the titration of the NaF / AlF 3 ratio in aluminum electrolytes , There is more obvious color change, and the sensitivity is high, the result is accurate. Experimental Part (A) of the main reagents 1. Aluminum trichloride solution (a): The aluminum chloride (AlCl 3 · 6H 2 O) 13.4 g dissolved in water, diluted to 1000 ml, shake. 2.CTMAB solution: 0.05%. Weigh 0.05 g CTMAB water 60 ml slightly soluble, cooled, diluted with water to 100 ml, shake.