不同浓度乙醇水溶液核磁共振实验研究

摘要

利用核磁共振方法研究了质量分数在0％～100％范围内乙醇水溶液的横向弛豫时间和信号强度，分析了乙醇水溶液质量分数与溶液分子间氢键的整体作用力及核磁共振信号强度之间的关系。结果表明：乙醇水溶液分子间氢键的整体作用力随乙醇质量分数增加呈现先增大后减小的变化关系，当乙醇质量分数为55．6％时出现最强氢键缔合状态；核磁共振信号强度随乙醇水溶液质量浓度的增加而增大，并且二者之间存在较好的线性关系。利用这种关系可实现乙醇水溶液浓度的核磁共振测量，为方便、快速、精确地测量乙醇水溶液的浓度提供了一种新方法。%The relationship between the mass concentration of ethanol and the overall strength of hydrogen bonding as well as the strength of nuclear magnetic resonance (NMR) signal has been respectively researched through measuring the transverse relaxation time and signal strength of NMR of ethanol water solution whose concentrations are ranged from 0 ~ 100% . The results indicate that the strongest association of hydrogen bonding occurs at the ethanol concentration of 55 .6% .Along with the increasing ethanol concentration ,the overall strength of hydrogen bonding rises and reaches its peak while the concentration is 55 .6% ,and then it starts to decrease .The strength of NMR signal is increased linearly with raising concentration of ethanol . Furthermore ,a novel method has been found to conveniently ,rapidly and accurately measure the concentration of ethanol water solution by using NMR .