title: Experimental and theoretical study of anion-exchange preparative chromatography for neptunium: the first application to thorium(IV) and its equilibrium and kinetics.
abstract: In order to study equilibrium and kinetic parameters in anion-exchange chromatography for preparatory purpose, a quantitative model for nonlinear anion-exchange chromatography in porous media was constructed, by paying special attention to interstitial length along void structure (cm) distinguished from apparent length (cm*). Langmuir-type adsorption isotherm for thorium(IV), as a natural substitution for neptunium(IV), in 6 mol dm(-3) nitric acid to anion-exchanger MSA-1 (200-400 mesh) was investigated in batch-wise and chromatographic experiments. The equilibrium parameters determined by batch-wise experiments determined as k=2.4x10(2) mol(-1) dm3 s(-1) and s0=0.5 mol dm(-3) agrees very well with the values of k=222 mol(-1) dm3 s(-1) and s0=0.5 mol dm(-3) derived from fitting by the numerical calculation. Kinetic parameters of ks and D affect band profile similarly, thereby maximum value of each parameter was evaluated as ks=1.3 mol(-1) dm3 s(-1) and D=9x10(-4) cm2 s(-1) by the numerical calculations.
authors: Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan. yamamura@imr.tohoku.ac.jp
authors: Tomoo
authors: T
authors: Yamamura
authors: Takeshi
authors: T
authors: Miyakoshi
authors: Yoshinobu
authors: Y
authors: Shiokawa
authors: Toshiaki
authors: T
authors: Mitsugashira
mesh_terms: D000327:Adsorption; D000837:Anion Exchange Resins / Q000737:chemistry; D000838:Anions; D002852:Chromatography, Ion Exchange / Q000295:instrumentation* / Q000379:methods*; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical; D009405:Neptunium / Q000737:chemistry*; D016062:Porosity; D013816:Thermodynamics; D013910:Thorium / Q000737:chemistry*
chemical_list: D000837:Anion Exchange Resins; D000838:Anions; D013910:Thorium; D009405:Neptunium