論文
高分子量第四アンモニウム塩による 酒石酸水溶液からのルテニウム(？) およびロジウム(？)の抽出
2000 年 116 巻 9 号 p. 784-788
詳細
2000 年 116 巻 9 号 p. 784-788
The extraction of ruthenium (III) and rodium (III) from aqueous tartaric acid solutions have been investigated by using trioctylmethylammonium hydrogen tartarate (TOMAHTar ; R3R'NHTar) in benzene.
The distribution ratios of both metals increase with increasing aqueous pH. The order of extraction efficiency is Ru > Rh.
At pH ≥7, the stoichiometric composition of major complex for both metals formed in the organic phase represent as R3R'NM(Tar)2(H2O)2, in which M denotes Ru and Rh. Therefore, it was deduced that although the extraction of both metals proceed according as following equilibrium equation ;
M(Tar)2(H2O)2-(a) + R3R'NHTar(o)⇔R3R'NM(Tar) 2(H2O)2(o) + HTar-(a)
where (a) and (o) represent aqueous and organic phases, respectively, the origomer species is extracted with decreasing aqueous pH.
These results were also confirmed by infrared and visible spectral measurement of the extracts.
