超细氢氧化铝中氯离子的测定

Investigation on determination of chlorine Ion in ultra-fine hydrate alumina

研究了用硫酸溶解超细氢氧化铝并测定氯离子的方法.控制硫酸的加入量,调节溶液的PH值在2～3之间,以二苯偶氮碳酰肼作为指示剂,用标准硝酸汞溶液滴定.测定超细氢氧化铝中氯离子的相对平均偏差在1.2%～38%,加标回收率在95.50%～109.10%之间,此方法准确度高,结果稳定,操作简便.

This article describes the method to determine chlorine ion by dissolving ultra- fine hydrate alumina into sulfuric acid solution. Under control of sulfuric acid addition and PH of 2 and 3, diphenyl carbazone as an indicator, and titration by standard mercuric nitrate, it is determined that the relatire average deviation of chlorine ion is between 1, 2 and 3,8 %, recovery rate is between 95.50 % and 109. 10 %, This method is characterized by high accuracy, stable result and easy operation.