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研究结果表明,在混合表面活性剂CTMAB-吐温-60存在下的pH5.7~6.5的缓冲介质中,Sc(Ⅲ)与4,5-二溴苯基荧光酮(DBPF)形成高灵敏的多元配合物,其ε_(590)=2.26×10 ̄5L·mol ̄(-1)·cm ̄(-1),组成比为:Sc:DBPF:CTMAB=1:2:4。采用混合表面活性剂使增溶增敏作用更为显著,并加速了显色反应,增强了配合物的稳定性。而Na_2SO_4的加入能显著地提高体系的灵敏度。Sc量在0~0.36ug/ml范围内遵守比尔定律。方法可直接测定合成混合稀土中的Sc,回收率在98%~105%;结合沉淀分离和PMBP萃取分离,实现了地质试样中痕量Sc的测定。
The results showed that Sc (Ⅲ) and DBPF formed high buffer media with pH5.7 ~ 6.5 in the presence of mixed surfactant CTMAB-Tween-60 The sensitive multivalent complex has ε 590 590 = 2.26 × 10 -5 L · mol -1 (-1) cm -1 and composition ratio Sc: DBPF: CTMAB = 1: 2: 4. The use of mixed surfactants makes solubilization and sensitization more significant, accelerates the color reaction and enhances the stability of the complex. The addition of Na_2SO_4 can significantly improve the sensitivity of the system. Beer’s law is obeyed in the range of 0 ~ 0.36ug / ml. The method can directly measure the content of Sc in synthetic rare earth, and the recovery rate is between 98% and 105%. The determination of trace Sc in geological samples is achieved by the combination of precipitation separation and PMBP extraction and separation.