用甲基橙指示剂改进离子交换法测定水泥中SO_3  

Using methyl orange as indicator in measurement of SO_3 in cement by ion exchange of acid-base titration

作　　者：梁雅婷[1] 巫辉[1] 杜小弟[1] 陈学兵 张磊[1] 郭丽萍[1] 雷家珩[1] 

机构地区：[1]武汉理工大学理学院,湖北武汉430070 [2]武汉格瑞林建材科技股份有限公司,湖北武汉430205

出　　处：《水泥》2014年第6期27-29,共3页Cement

摘　　要：在离子交换酸碱滴定法测定水泥SO3的过程中，采用甲基橙为指示剂替代酚酞，并用硫酸钡重量法进行对比分析。结果表明，以酚酞为指示剂时测定结果的误差在0．17％～0．54％之间，标准偏差为0．09％；以甲基橙为指示剂时测定结果的误差在-0．03％～0．08％之间，标准偏差为0．05％。以甲基橙替代酚酞，可有效避免游离硅酸的干扰，且终点更加敏锐，重现性和准确性都显著提高。The methyl orange has been used as the indicator to replace phenolpbthalein in the measurement of S03 in cement by ion exchange of acid-base titration, and those results have been compared with barium sulfate gravimetric method for accuracy. The resuhs showed that the error of the measurement dates was 0.17% - 0.54% when using phenolphthalein as indicator, and the standard deviation was 0.09%. The error of the measurement dates was -0.03% - 0.08% when using methyl orange as indicator, and the standard deviation was 0.05%. Using methyl orange to replace phenoiphthalein could effectively avoid the interference of free silicate, and the end-point indication was more sensitive. The reproducibility and accuracy of ion exchange acid-base titration would be significantly improved when using methyl orange as indicator.

关 键 词：水泥 SO3测定方法 甲基橙 游离硅酸干扰 

分 类 号：TQ172.16[化学工程—水泥工业]