用ＮＭＲ方法研究了氨三乙氧基乙酸（ＮＴＥＡ）的质子解离过程及其与Ｌａ３＋、Ｙ３＋、Ｌｕ３＋和Ｃａ２＋的配合作用．ＮＴＥＡ的氮原子和羧基的质子解离常数分别为８．８和３．０．当ｐＨ＞３．０时，Ｌａ３＋、Ｙ３＋和Ｌｕ３＋配合物能稳定形成（＞５０％），而Ｃａ２＋配合物则需出＞５．在ｐＨ３～６范围内，配合物与配体间的交换反应处于慢－中介交换速率区间，通过变温谱模拟得到了其交换反应的动力学参数． The proton dissociation process of ammonia triethoxyacetic acid (NTEA) and its coordination with La3 +, Y3 +, Lu3 + and Ca2 + were studied by NMR. The NTEA has a proton dissociation constant of nitrogen and carboxyl of 8.8 and 3.0, respectively. When pH> 3.0, La3 +, Y3 + and Lu3 + complexes can form stably (> 50%), while Ca2 + complexes require> 5. In the range of pH3 ~ 6, the exchange reaction between the complex and the ligand is in the slow-intermediate exchange rate interval. The kinetic parameters of the exchange reaction are obtained by the simulation of the temperature-programmed spectrum.