Tsuguchi Akira, Ohashi Akira, Choi Sung-Yong, Imura Hisanori, Ohashi Kousaburo
Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan.
Anal Sci. 2002 Nov;18(11):1227-33. doi: 10.2116/analsci.18.1227.
The extraction of vanadium(V) with 2-methyl-8-quinolinol derivatives (HA), such as 2-methyl-8-quinolinol (HMQ), 2-methyl-5-butyloxymethyl-8-quinolinol (HMO4Q), and 2-methyl-5-hexyloxymethyl-8-quinolinol (HMO6Q), from a weakly acidic solution into chloroform was studied in both the absence and presence of 3,5-dichlorophenol (Hdcp) and trioctylphosphine oxide (TOPO) as the synergists. Vanadium(V) was extracted with HA as VO(OH)(A)2 in the absence of synergists, and its extractability increased with an increase in the hydrophobicity of HA. Vanadium(V) was quantitatively extracted from the lower pH region upon the addition of Hdcp and TOPO as VO(OH)(A)2 x Hdcp and VO2(A)(TOPO), respectively. The enhancement of the synergistic effect of Hdcp on the extraction of vanadium(V) with HA increased in the following order: HMQ < HMO4Q < HMO6Q, as opposed to that of TOPO. This result was ascribable to the difference in the mechanisms of the occurrence of the synergistic effect by Hdcp and TOPO.
研究了在不存在和存在作为协同剂的3,5-二氯苯酚（Hdcp）和三辛基氧化膦（TOPO）的情况下，用2-甲基-8-喹啉醇衍生物（HA），如2-甲基-8-喹啉醇（HMQ）、2-甲基-5-丁氧基甲基-8-喹啉醇（HMO4Q）和2-甲基-5-己氧基甲基-8-喹啉醇（HMO6Q），从弱酸性溶液中萃取钒（V）至氯仿中的情况。在不存在协同剂时，钒（V）以VO(OH)(A)2的形式被HA萃取，其萃取率随HA疏水性的增加而提高。加入Hdcp和TOPO后，钒（V）分别以VO(OH)(A)2·Hdcp和VO2(A)(TOPO)的形式从较低pH区域被定量萃取。与TOPO相反，Hdcp对HA萃取钒（V）的协同效应增强顺序为：HMQ＜HMO4Q＜HMO6Q。该结果归因于Hdcp和TOPO产生协同效应的机制不同。
