高岭土中全硫量快速测定方法  

Rapid Method for the Determination of Total Sulphur Content in Kaolin

作　　者：王瑞斌[1] 

机构地区：[1]榆林学院化学与化学工程学院,陕西榆林719000

出　　处：《岩矿测试》2006年第1期82-84,共3页Rock and Mineral Analysis

摘　　要：采用碳酸钠一氧化镁半熔融一氯化钡滴定法测定高岭土中的硫含量。试样用碱性熔荆半熔，熔块以水浸取，将转化为硫酸盐后的滤液，以玫瑰红酸钠为指示剂，在pH为5．5．7．0的条件下，用氯化钡标准溶液进行滴定。测定结果的RSD=2．47％（n=5），加标回收率为95．2％-100．3％。改进后的方法已用于高岭土中全硫量的测定，结果与国标重量法相符。A method for the determination of total sulphur content in kaolin samples by titrimetry was reported in this paper. Samples were semi-melted with Na2CO3 ＋MgO. The melt was then soaked with water and the solution was filtered. Sulphur （in SO4^2- form） in the filtrate was titrated with BaCl2 standard solution at pH 5.5 -7.0 with sodium rhodizonate as indicator. The recovery of standard addition was 95.2% - 100.3% with precision of 2.47% RSD （n = 5 ）. The method has been applied to the determination of total sulphur in kaolin samples and the results are in agreement with those .provided by the national standard method （gravimetry）.

关 键 词：硫 容量法 高岭土 半熔融 玫瑰红酸钠 氯化钡 

分 类 号：O655.2[理学—分析化学] O613.51[理学—化学]