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界面张力有助于研究不相溶两相的界面行为。本文报道了在La(NO_3)_3-P204-稀释剂萃取体系萃取过程中界面张力的变化。选择影响表面张力的参数是水相pH,稀释剂中芳香烃和脂肪烃的含量以及表面活性剂。结果指出,界面张力的变化△γ[γ~E(平衡)-γ~F(料液)]随水相pH和萃取百分数的增加而增加,pH=2时△γ达到恒定。溶剂中芳香烃和脂肪烃化合物含量的变化并不明显影响界面张力。表面活性剂SLS和Newco1560SN的存在能减小表面张力和界面张力,并缩短相凝聚时间,但不影响分配比,本文也报道了临界胶束浓度。
Interfacial tension helps to investigate the interfacial behavior of immiscible phases. This paper reports the change of interfacial tension during the extraction of La (NO_3) _3-P204-diluent extraction system. The parameters that influence the surface tension are the pH of the aqueous phase, the amount of aromatic and aliphatic hydrocarbons in the diluent, and the surfactant. The results showed that the change of interfacial tension △ γ [γ ~ E (balance) -γ ~ F (liquid)] increased with the increase of aqueous phase pH and extraction percentage, and reached a constant at pH = 2. Changes in the content of aromatic hydrocarbons and aliphatic hydrocarbons in the solvent did not significantly affect the interfacial tension. The presence of surfactants SLS and Newco 1560SN can reduce the surface tension and interfacial tension and shorten the phase cohesion time, but does not affect the partition ratio. We also report the critical micelle concentration in this paper.