Thesis (MSc)--University of Stellenbosch, 2003. / ENGLISH ABSTRACT: The equilibrium distribution coefficients of 42 elements [Li(I), Na(I), K(I), Rb(I),
Cs(I), Sc(III), Ti(IV), V(IV), V(V), Mn(II), Fe(III), Ni(II), Zn(II), Al(III), Ga(III),
As(V), Y(III), Zr(IV), Nb(V), Mo(VI), Cd(II), In(III), Sn(IV), Sb(V), Ta(V), W(VI),
Pb(II), Bi(III), La(III), Ce(III), Th(IV), U(VI), Co(II), Ag(I), Ge(IV),Mg(II), Sr(II),
Ba(II), Tb(III), Yb(III), Cr(III) and Cu(II)] on Bio Rad AG MP-50 macroporous
cation exchange resin in varying citric acid – nitric acid mixtures were successfully
determined. The equilibrium distribution coefficients of these selected elements were
determined in 0.1 M and 0.25 M citric acid at various concentrations of nitric acid,
namely, 0.2 M, 0.5 M, and 1.0M, respectively.
Two component [Mo(VI)-Y(III); Zr(IV)-La(III) and As(V)-Zn(II)] and three
component [Nb(V)-Ta(V)-V(V)] elemental separations on a 10 ml AG MP-50 resin
column were successfully determined to illustrate how the results of the above
equilibrium distribution coefficients can be utilised.
From the equilibrium distribution coefficients obtained for magnesium(II) and
sodium(I), a proposal was put forward to modify the current sodium-22 production
performed at iThemba LABS. While the results did not predict a possible separation
between the two elements, a theory concerning the use of citric acid in the production
was proven not to hold under the chosen conditions. / AFRIKAANSE OPSOMMING: Die ewewig verdelingskoëffisiënte van 42 elemente [Li(I), Na(I), K(I), Rb(I), Cs(I),
Sc(III), Ti(IV), V(IV), V(V), Mn(II), Fe(III), Ni(II), Zn(II), Al(III), Ga(III), As(V),
Y(III), Zr(IV), Nb(V), Mo(VI), Cd(II), In(III), Sn(IV), Sb(V), Ta(V), W(VI), Pb(II),
Bi(III), La(III), Ce(III), Th(IV), U(VI), Co(II), Ag(I), Ge(IV),Mg(II), Sr(II), Ba(II),
Tb(III), Yb(III), Cr(III) en Cu(II)] is op Bio Rad se AG MP-50 makroporeuse
kationiese uitruilerhars in verskillende sitroensuur – salpetersuur mengsels met sukses
bepaal. Die verdelingskoëffisiënte is in 0.1 M en 0.25 M sitroensuur met verskillende
konsentrasies van salpetersuur (0.2 M, 0.5 M en 1.0 M) bepaal.
Twee-komponent [Mo(VI)-Y(III); Zr(IV)-La(III) en As(V)-Zn(II)] en drie-komponent
[Nb(V)-Ta(V)-V(V)] skeidings op ’n 10 ml AG MP-50 harskolom is suksesvol bepaal
om te demonstreer hoe die verdelingskoëffisiëntresultate gebruik kan word.
As ’n uitvloeisel van die verdelingskoëffisiëntresultate vir Mg(II) en Na(I), is ’n
voorstel ingedien om die huidige natrium-22 produksiemetode, tans in gebruik by
iThemba LABS, te modifiseer. Die resultate het nie ’n skeiding tussen die twee
elemente voorspel nie, maar het bewys dat ’n teorie oor die gebruik van sitroensuur in
die produksie nie heeltemal korrek was onder die huidige toestande nie.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/16452 |
| Date | 04 1900 |
| Creators | Van der Meulen, Nicholas |
| Contributors | Van der Walt, T.N., Raubenheimer, H.G., University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | 130 leaves : ill. |
| Rights | University of Stellenbosch |
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