基于质量滴定卤水中硼分析方法改进研究

Study of improvement on mass titration of borate in brine

为避免CO_2对甘露醇碱量法测定溶液中硼的影响,本文在质量滴定法基础上,对质量滴定装置进行改进,增加滴定瓶与锥形瓶间封闭连接管,构成相对CO_2为封闭体系的质量滴定装置,并采用改进装置测定卤水中硼含量。结果表明,使用改进装置进行硼分析时,相对最大偏差<0.2%,标准偏差<2×10-5,加标回收率为100.06%~100.20%。对卤水中硼含量测定,符合溶液热力学对浓度准确性的要求。

In the present work,to avoid the influence of CO2 in mannitol alkaline method,we described a modified mass titration analytical method and appliance to analyze boron in brine.The sealed joint pipe are added in appliance between the mass titration bottle and conical flask to form a closed system and thus isolating CO2. The results of borate concentration show that the maximal relative error is no more than 0. 2%,standard deviation is less than 2×10^-5,and the recoveries of boron are in the range from 100. 06%to 100. 20%by the modified appliance.The modified mass titration method is appropriate for the solution thermodynamic.