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采用流动注射滴定技术实现了氧化铝生产过程中铝酸钠溶液中苛性碱、碳酸碱和全碱的同时自动分析。以磺基水杨酸为载流，它既为滴定剂又是铝的掩蔽剂；酚酞和甲基橙混合液为试剂流，它们是苛性碱、碳酸碱和全碱的指示剂。该法可测定6．2～30．9g/L的碳酸碱和3．1～15．5g/L的苛性碱（均以Na2O计），测定速率30个样/h，相对标准偏差优于0．5％（n＝11，Na2O＝21．94g/L）。
The simultaneous automatic analysis of caustic soda, alkali carbonate and total alkali in sodium aluminate solution was realized by flow injection titration. Sulfosalicylic acid as a carrier, which is both a titrant and aluminum masking agent; phenolphthalein and methyl orange mixture as a reagent flow, they are caustic alkali, alkali carbonate and alkali indicator. The method can determine 6.2 ~ 30.9g / L of carbonate and 3.1 ~ 15.5g / L of caustic (all in terms of Na2O), the determination rate of 30 samples / h, the relative standard deviation better than 0 .5% (n = 11, Na2O = 21.94 g / L).