镓（III）与二（2-乙基己基）磷酸和8-喹啉醇衍生物在超临界二氧化碳中的协同萃取平衡
Synergistic extraction equilibrium of gallium(III) with di(2-ethylhexyl)phosphoric acid and 8-quinolinol derivatives into supercritical carbon dioxide.
作者信息
Ohashi Akira, Kawashima Natsumi, Sato Kazuaki, Kim Haeng-Boo
机构信息
College of Science, Ibaraki University, Mito, Japan.
出版信息
Anal Sci. 2013;29(1):127-32. doi: 10.2116/analsci.29.127.
The synergistic effect of five 8-quinolinol derivatives (HQs) on the extraction of gallium(III) with di(2-ethylhexyl)-phosphoric acid (D2EHPA or HA) from weak nitric acid into supercritical carbon dioxide (SC-CO(2)) was investigated. 8-Quinolinol (Hq), 5-ethoxymethyl-8-quinolinol (HO(2)q), 5-hexyloxymethyl-8-quinolinol (HO(6)q), 5-(2,2,2-trifluoroethoxymethyl)-8-quinolinol (HFO(2)q), and 5-chloro-8-quinolinol (5-Cl-Hq) were used as synergists. Synergism was observed for all of the HQs. The synergistic effect increased in the following order: Hq < HO(2)q < HFO(2)q < 5-Cl-Hq ≍ HO(6)q. The extent of synergism can be related to both the distribution constant and the acid dissociation constant of the HQ. The synergistic extraction equilibrium of gallium(III) with D2EHPA and 5-Cl-Hq into SC-CO(2) was investigated; the results suggest that the composition of the extracted complex is as GaA(2)Q·HA. The synergistic extraction mechanism was the same for both SC-CO(2) and n-heptane. The synergistic extraction equilibrium constants in both cases were calculated based on the experimental results.
研究了五种8-喹啉醇衍生物（HQs）与二（2-乙基己基）磷酸（D2EHPA或HA）协同作用从稀硝酸中萃取镓（III）至超临界二氧化碳（SC-CO₂）中的效果。使用8-喹啉醇（Hq）、5-乙氧基甲基-8-喹啉醇（HO₂q）、5-己氧基甲基-8-喹啉醇（HO₆q）、5-（2,2,2-三氟乙氧基甲基）-8-喹啉醇（HFO₂q）和5-氯-8-喹啉醇（5-Cl-Hq）作为协同剂。观察到所有HQs均有协同作用。协同效应按以下顺序增强：Hq < HO₂q < HFO₂q < 5-Cl-Hq ≍ HO₆q。协同程度与HQ的分配常数和酸解离常数均有关。研究了镓（III）与D2EHPA和5-Cl-Hq协同萃取至SC-CO₂中的平衡；结果表明萃取络合物的组成为GaA₂Q·HA。SC-CO₂和正庚烷的协同萃取机理相同。基于实验结果计算了两种情况下的协同萃取平衡常数。
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