Ion-pair extractions of platinum group metals and Zr, Hf, Nb, Ta by extractant having amino N atom

Sasaki, Yuji  ; Matsumiya, Masahiko*; Kaneko, Masashi   ; Kumagai, Yuta   

The metal-anions formed in acidic solutions can be extracted using extractants having amino N donor, which is protonated and formed to cationic extarctant there. However, there is few systematic results using this ion-pair extraction, and the extraction behavior needs more information. Therefore, we conduct experiments using different aqueous and organic phases. The disuribution ratios of Pd, Zr, Hf, Nb, Ta are over 100, and Ru, Rh, Nb, and Ta, those are considered to be hard to extract, can be extracted using this method.