利用长弛豫低场核磁共振技术分别测定了六水合氯化钆水溶液、N,N-二甲基甲酰胺(DMF)溶液和六水合硝酸钕水溶液在不同浓度下的横向弛豫时间(T_2)。3种溶液体系中氢质子的横向弛豫速率(1/T2)与稀土离子的浓度均呈现出良好的线性关系,提出了利用低场核磁技术测定溶液中Gd~(3+)和Nd~(3+)浓度的方法。 The relaxation time (T_2) of gadolinium hexahydrate aqueous solution, N, N-dimethylformamide (DMF) solution and neodymium nitrate hexahydrate aqueous solution at different concentrations were determined by long relaxation low field nuclear magnetic resonance (NMR) . The lateral relaxation rate (1 / T2) of hydrogen protons and the concentration of rare earth ions in the three solutions show a good linear relationship, and the low field nuclear magnetic resonance technique is used to determine the concentration of Gd ~ (3+) and Nd ~ 3+) concentration method.