摘要
为了认识氯化钙水溶液的核磁共振特性,探索核磁共振技术测量氯化钙水溶液浓度的新方法,配制了浓度在0%~40%范围内的氯化钙水溶液,采用CPMG自旋回波法测量了核磁共振T2谱,分析了氯化钙水溶液浓度与核磁共振横向弛豫时间及峰面积之间的函数关系,探索了通过横向弛豫时间和峰面积两种方法测量氯化钙水溶液浓度的可行性。实验结果表明:随着氯化钙水溶液浓度的增加,横向弛豫时间呈二次函数关系减小,单位质量的峰面积呈线性关系减小;与配制浓度相比,弛豫时间测量方法的相对误差均低于0.5%,峰面积测量方法的相对误差不大于2.2%;在测量的重复性上,测量数据的实验标准偏差均波动未超过测量数据均值上下2.0%的范围。
In order to understand the NMR characteristics of calcium chloride aqueous solution and explore a new method for determining the concentration of calcium chloride by NMR,the calcium chloride aqueous solution with the concentration of 0%~40%,was prepared.The NMR T2 spectrum was determined by CPMG spin-echo method,and the relationship between calcium chloride aqueous solution concentration and the transverse relaxation time and the peak area of NMR was analyzed.The experimental results showed that the transverse relaxation time decreased quadratically with the increase of the concentration of calcium chloride solution,and the peak area per unit mass decreased linearly with the increase of the concentration of calcium chloride solution.These two relationships can be used to determine the concentration of calcium chloride solution by NMR method.The relative error of relaxation time measurement method was less than 0.5%,and the relative error of peak area measurement method was not more than 2.2%.Aiming at the repeatability of measurement,the experimental standard deviation of data was less than 2.0%compared with the mean value.
作者
朱宜昌
施文童
宋睿
彭双喜
王殿生
ZHU Yi-chang;SHI Wen-tong;SONG Rui;PENG Shuang-xi;WANG Dian-sheng(College of Science,China University of Petroleum,Shandong Qingdao 266580,China)
出处
《当代化工》
CAS
2020年第5期806-809,813,共5页
Contemporary Chemical Industry
基金
大学生创新训练计划项目,项目号:20181470
山东省研究生教育质量提升计划项目,项目号:SDYY17021
中国石油大学(华东)教学研究与改革重点项目,项目号:JY-A201818
关键词
氯化钙水溶液
浓度
核磁共振
横向弛豫时间
峰面积
Calcium chloride aqueous solution
Concentration
Nuclear magnetic resonance
Transverse relaxation time
Peak area
