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Citation: Li Qiongqing, Li Deqian. Extraction Mechanism of Th(Ⅳ) with Bis(2,4,4-Trimethylpentyl)phosphinic Acid from Hydrochloric Acid Medium[J]. Chinese Journal of Applied Chemistry, ;1995, 12(4): 58-61. shu

Extraction Mechanism of Th(Ⅳ) with Bis(2,4,4-Trimethylpentyl)phosphinic Acid from Hydrochloric Acid Medium

Li Qiongqing ,
Li Deqian

Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received Date: 5 October 1994
Revised Date: 19 April 1995

The extraction mechanism of Th(Ⅳ) with bis(2,4,4-trimethylpentyl)phosphinic acid (HA) in n-octane from HCl medium with different ionic strength is studied. When the ionic strength of the aqueous phase is not controlled,the extraction equilibrium is Th⁴⁺+Cl+3(HA)_2(о)⇄ThClA₃·(HA)_3(о)+3H⁺. And when the ionic strength is 1.0mol/L, the extraction equilibrium is Th⁴⁺+2Cl^-+3(HA)_2(о)⇄ThCl₂A₂·(HA)_4(о)+2H⁺. The composition of the extracted complex determined by the saturation method is ThClA₃. The effect of temperature on the extraction of Th(Ⅳ) indicates that it is an endothermal re-action. The stability constants and thermal mechanical functions of the extraction reaction are calculated. The IR and NMR spectra of the saturated complex are studied.
- bis(trimethlpentyl)phosphinic acid,
- extraction mechanism,
- Th(Ⅳ),
- IR,
- NMR
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