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本文用pH电位滴定法、吸收光谱法及凝胶过滤色谱法对CrCl_3—NdCl_3、CrCl_3—NdCl_3—HLac以及CrCl_3—NdCl_3—Na_2SO_4水溶液体系的水解聚合及体系中多核配合物的形成做了较系统的研究。研究结果表明,Nd(Ⅲ)对Cr(Ⅲ)的水解聚合有显著的促进作用,但Nd(Ⅲ)不能与Cr(Ⅲ)形成常量意义上的羟基桥联异多核配合物。在CrCl_3—NdCl_3—HLac体系中,当Cr:Nd:l Lac=1:1:2—3时,可形成可观量的Lac~-桥联异多核配合物。而当Cr:Nd:HLac=1:1:1时,仅在pH较高的条件下,Cr(Ⅲ)多核配合物中含有一定量的Nd(Ⅲ)。
In this paper, the hydrolysis of CrCl_3-NdCl_3, CrCl_3-NdCl_3-HLac and CrCl_3-NdCl_3-Na_2SO_4 aqueous solution system and the formation of polynuclear complexes were systematically studied by pH potentiometric titration, absorption spectroscopy and gel filtration chromatography the study. The results show that Nd (Ⅲ) can promote the hydrolysis of Cr (Ⅲ) significantly, but Nd (Ⅲ) can not form a constant amount of hydroxyl bridged heteronuclear complex with Cr (Ⅲ). In CrCl_3-NdCl_3-HLac system, an appreciable amount of Lac ~ - bridged heteronuclear complex can be formed when Cr: Nd: 1 Lac: 1: 1: 2-3. When Cr: Nd: HLac = 1: 1: 1, only a certain amount of Nd (Ⅲ) was contained in the complex of Cr (Ⅲ) at high pH.