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本文系统地研究了稀土与对氨基本基萤光酮(P-APF)及溴化十六烷基三甲铵(CT-AB)形成三元络合物的规律,结果表明,RE~(3+)与P-APF、CTAB在不同pH范围可形成两种络合物,在pH7-9,形成橙红色络合物,摩尔吸光系数(ε)为7.50×10~41.25×10~5l·mol~(-1)·cm~(-1),λ_(max)为534—540nm;在pH>10.5,形成玫瑰红色络合物,ε值为1.30×10~5—1.58×10~5l·mol·cm~(-1),λ_(max)为585—597。在三元络合体系中加入竞争配体NaF、EDTA,提高了体系的选择性,在NaF存在下,从La中回收Sm,在EDTA存在下,从La中回收Ce,结果的重现性较好。
In this paper, we systematically studied the formation of ternary complexes of rare earth with p-APF and cetyltrimethylammonium bromide (CT-AB). The results show that RE ~ (3+ ) Formed two complexes with P-APF and CTAB in different pH ranges. At pH7-9, the complex formed an orange-red complex with a molar absorptivity (ε) of 7.50 × 10 ~ 41.25 × 10 ~ 5l · mol ~ (-1) · cm -1 and λ max (max) was 534-540 nm. At pH> 10.5, the rosette complexes formed with ε values of 1.30 × 10-5-1.58 × 10-5 mol · cm -1, λ max 585-597. The addition of competing ligands NaF and EDTA to the ternary complex system increased the selectivity of the system. Sm was recovered from La in the presence of NaF, and Ce was recovered from La in the presence of EDTA. The reproducibility of the results was better it is good.