本文用pH法在NO_3~-浓度为2M时研究了浓度为0.1～0.6M的Sm~(3+)在25℃时的水解聚合作用.实验发现在溶液中的聚合状态较Pr~(3+)离子更为复杂,与Cr~(3+)离子有类似之处,即有相同类型的“根+节”配合物M[M(OH)_2]_n~((3+n)+),n=1,2,3形成,但Sm~(3+)离子的水解程度远较Cr~(3+)离子为低.用同配体常数法和作图外推法计算了溶液中存在的各水解产物的平衡常数,两者结果一致. In this paper, the hydrolysis of Sm ~ (3+) at a concentration of 0.1 ~ 0.6M was studied at 25 ℃ with NO_3 ~ 2M, and the polymerization state in solution was found to be better than that of Pr ~ (3+ ) Ions are more complex and have similarities with Cr 3+ ions, that is, the same type of “root + node” complex M [M (OH) 2] _n ~ (3 + n) However, the degree of hydrolysis of Sm ~ (3+) ions is far lower than that of Cr ~ (3+) ions. The ligands constant method and extrapolation method are used to calculate the existence of The equilibrium constants of each hydrolysates, the two results are consistent.