Abstract：Excessive iodine was added into sodium aluminate solution to react with S2-, S2O32- and SO32- by controlling the different conditions.Then, the excessive iodine was back-titrated using thiosulfate standard solution.Finally, the content of S2-, S2O32- and SO32- was obtained by subtraction method. Thus, the determination method of S2-, S2O32- and SO32- in sodium aluminate solution by indirect iodometry was established. KIO3 did not react with KI under neutral condition, but the reaction occurred under acidic condition to form iodine. According to this characteristic, the iodine standard solution was prepared using reference KIO3 and excessive KI under neutral condition. During testing, the quantitative iodine could be obtained by adding acid and iodine standard solution into the sample solution,which avoided the concentration changing problem of iodine due to the instability. The proposed method was applied to the determination of sodium aluminate solution (high-pressure stripping liquid, crude liquid, seeded liquor) during different production processes. The relative standard deviation (RSD, n=5) for S2-,S2O32- and SO32- was 0.68%-0.82%, 0.26%-0.44% and 0.38%-0.74%, respectively. The content of S2-,S2O32- and SO32-in three synthetic standard sodium aluminate solutions was measured by experimental method. The found results were consistent with the theoretical values.
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