称量滴定法分析硫酸根含量  

Weighing Titration Analysis of the Sulfate Content

作　　者：吕鹏[1,2] 钟远[1] 孟瑞英[1] 孙柏[1] 宋彭生[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008 [2]中国科学院大学,北京100049

出　　处：《盐湖研究》2015年第3期5-13,共9页Journal of Salt Lake Research

摘　　要：依据茜素红容量法滴定硫酸根的原理,采用称量滴定法分析硫酸根含量,考察了滴定速度、指示剂浓度、醇含量、p H对实验结果的影响。在确定了基本滴定条件后对实验方法的准确度、精密度以及加标回收进行了测定。消除了共存离子（Na^＋、NH^＋、K^＋、Mg^2＋、Li^＋、Ca^2＋、CO3^2-、B4O7^2-）存在时对硫酸根含量分析结果的影响。当测定硫酸根含量在19-103 mg范围内,均可使分析精度为±0.3%。Based on the principle of alizarin red S titration sulfate with volumetric method, the weighing titration analysis method of sulfate radical content was established. The influences of titration speed, indi- cator concentration, alcohol content, and pH on the results of the experiment were investigated. Accura- cy, precision and standard addition recovery of this method were determined after the basic titration condi- tions. And the effects of the coexistence ions including Na^＋, NH4^＋ , K^＋, Mg^2＋, Li^＋, Ca^2＋ , CO3^2- , B4O7^2- were eliminated. When the determination of sulfate radical content within 19 - 103 mg, the analysis accu- racy are less than ＋0.3%.

关 键 词：硫酸根离子 称量滴定法 茜素红 

分 类 号：O655.1[理学—分析化学]