Abstract
The extraction of HClO₄, HCl, HBr, HI, HNO₃, citric acid and the metal ions; iron(III), zinc(II), cadmium(II), hafnium(IV) and zirconium(IV) by tris(n-octyl)arsine oxide (TOCASO) in benzene was investigated. A survey of the qualitative extraction of some 40 metal ions was also reported. From saturation loading curves it was found that the proton to TOCASO ratio was 2:1 when the acids were extracted by 0.1 M concentrations of the reagent in benzene. In the HClO₄ system, the co-extraction of water was noted and the adduct was probably of the type TOCASO[proton symbol]H₃O[proton symbol]ClO[superscript negative sign, subscript 4]. Hydrochloric acid formed a 2:1 adduct with TOCASO at aqueous acid concentrations [greater than or equal to] 1.0 M. The HCl adduct was presumably of the type TOCASOHHCl[superscript negative sign, subscript 2]. Hydrobromic and hydroiodic acid formed 1:1 adducts at initial aqueous acid concentrations of 0.1 to 2.0 M. The co-extraction of one mole of water with each mole of acid was observed under these conditions. At HBr and HI concentrations [greater than or equal to] 4.0 M and [less than or equal to] 7.0 M formation of the adducts, TOCASOH�HBr[superscript negative sign, subscript 2] and TOCASOH�HI[superscript negative sign, subscript 2], was observed without co-extraction of water. Nitric acid formed a 1:1 adduct at initial acid concentrations of 0.1 to 1.0 M with co-extraction of water. As the nitic acid concentration was increased the ratio of reagent to acid increased, and concurrently, the ratio of water to acid decreased. At initial aqueous citric acid concentrations [greater than or equal to] 2.0 M the stoichiometry indicated a molar ratio of reagent to acid of 3:2. ...
Linder, Donald Ernst (1967). Tris(n-octyl)arsine oxide as a reagent for liquid-liquid extraction. Doctoral dissertation, Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -170677.