(中南大学 化学化工学院， 长沙 410083)
摘 要: 采用流动注射微量滴定分析方法，通过铝酸钠溶液分析仪，研究了以磺基水杨酸(SAL)为滴定剂、 NaF为络合剂及酚酞为指示剂时，自动分析铝酸钠溶液中氧化铝含量的方法。探讨了滴定剂浓度、采样体积、管道内径及长度、共存元素的影响，推测了NaF与SAL-Al(OH)3的络合比例。
关键字: 流动注射微量滴定； 铝酸钠； 氧化铝； 自动分析
sodium aluminate solutions by
micro-flow injection titration
（College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, P.R.China）
Abstract: Automatic determination of alumina in sodium aluminate solutions was realized by micro-flow injection titration. Sodium fluoride was used as complexing agent for alumina and releasing the corresponding hydroxide ion to alumina, phenolphthalein was used as the corresponding indicator for the determination of the corresponding hydroxide ion to alumina, sulfosalicylic acid was the titrant for the corresponding hydroxide ion to alumina, caustic hydroxide, and 1/2 sodium carbonate.
Key words: micro-flow injection titration; aluminate; alumina; automatic analysis
