在乙醇—水介质中采用硫酸钡沉淀滴定法测定氯化钡中钡的含量  

Determination of the content of barium in barium chloride using barium sulphate volumetric precipitation method in ethanol-water medium

作　　者：王瑞斌[1] 乔小安[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：《西安石油大学学报（自然科学版）》2006年第3期77-79,共3页Journal of Xi’an Shiyou University（Natural Science Edition）

摘　　要：提出了在乙醇—水介质中采用硫酸钡沉淀滴定法测定氯化钡中钡的含量．试样溶解并消除干扰后，在pH2．0～3．0的乙醇—水介质中，以茜素S为指示剂，用Na2SO4标准溶液进行滴定．结果表明，改进后的方法简单、快捷、准确、省时、干扰小；与重量法相比，相对误差小于0．5％，说明该方法的准确度与重量法相当；其相对标准偏差仅为0．20％，说明其重现性好．因此，该方法是一种既便于教学实验，又可满足现场生产要求的快速分析方法．It is put forward that the content of barium in barium chloride is determined using barium sulphate volumetric precipitation method in ethanol - water medium. After the sample is dissolved in the ethanol and water medium whose pH is 2.0 - 3.0, the barium ion is titrated by using Na2SO4( standard solution. The result shows that, the modified method is simple to operate, efficient and accurate, and it has little disturbance. Compared with weight method, the relative error of the method is less than 0.5%, which indicates that the accuracy of the method is close to that of weight method; its relative standard deviation is 0.20% , which indicates the repeatability of the method is very good. Therefore, the method is a quick analysis method, which can be used not only in instruc-tional experiments for students but also in field determination.

关 键 词：乙醇—水介质 茜素S 沉淀滴定 氯化钡 钡离子 

分 类 号：O655.24[理学—分析化学]