Solvent Extraction Study for 4f Series Elements by bis(2-ethylhexyl) Phosphoric Acid

A solvent extraction technique, using bis (2-ethylhexyl) phosphoric acid, (HDEHP), as the extractant, was employed to examine some characteristical difference between lighter and heavier parts of 4f series. Some difference in temperature dependencies of the distribution ratios between the two groups were observed for the aqueous systems of H$_2$SO$_4$ and HCI. This experimental results were tentatively assigned as the difference in the ability of formation of inner coordination complex with HDEHP derived from the lanthanon contraction.

중희사와 경희토간의 특성상의 차이를 보기 위하여 TIDEHP를 용매로 사용하여 HCl H$_2$SO$_4$ 및 HNO$_3$ 수용액으로 부터 유출해 보았다. H$_2$SO$_4$와 HCI계에서 중희토와 경희토간에 나타나는 추출률의 온도의가주은 서로 상이합을 알았으며 이것은 추출종인 배위착물형성에 있어 HDEHP의 배위권 차지에 차이 때문으로 해석된다.