Gao J, Hu G, Kang J, Bai G
Institute of chemistry, Northwest Normal University, Lanzhou 730070, China.
Talanta. 1993 Feb;40(2):195-200. doi: 10.1016/0039-9140(93)80321-h.
In the present paper, solid-liquid extraction behaviour of RE(III) (RE La, Ce, Pr, Nd, Sm, Gd, Dy and Yb) by the use of 1-(2-pyridylazo)-2-naphthol (PAN, HL) as an extractant in paraffin (m.p. 48 approximately 50 degrees) has been investigated at 80 +/- 0.07 degrees. The effect of equilibrium time, pH of aqueous phase, concentration of extractant in paraffin and solid diluent as well as buffer solution used on the extraction efficiency of RE(III) have been discussed. The extraction reaction is RE(3+) + 2HL(o) + Cl(-) <==> REL(2)Cl(o) + 2H(+).
在本文中，研究了在80±0.07℃下，以1-（2-吡啶偶氮）-2-萘酚（PAN，HL）为萃取剂，在熔点为48至50℃的石蜡中对稀土元素（III）（稀土元素La、Ce、Pr、Nd、Sm、Gd、Dy和Yb）的固液萃取行为。讨论了平衡时间、水相pH值、石蜡中萃取剂浓度、固体稀释剂以及所用缓冲溶液对稀土元素（III）萃取效率的影响。萃取反应为RE(3+) + 2HL(o) + Cl(-) <==> REL(2)Cl(o) + 2H(+) 。
