Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam

 

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dc.contributor.advisor Koch, Klaus en_ZA
dc.contributor.author Jones, Lynn en_ZA
dc.date.accessioned 2016-03-11T14:28:16Z
dc.date.available 2016-03-11T14:28:16Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Jones, L. 1987. Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17661
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The potentially quantitative and selective sorption of chloro-(trichlorostannato)-platinum(II) and -rhodium (III/I) complex anions by polyurethane foams has been examined. Quantitative separation of platinum(II) from iridium and ruthenium has been achieved. Rhodium( III) is similarly sorbed by polyurethane foam in the presence of sufficient tin(II) chloride and-its clean separation from iridium has been achieved using this method. Ruthenium, although not significantly sorbed under the same conditions as platinum and rhodium, appears to inhibit the extraction of the rhodium(III/I)-tin(II) species. A procedure has been developed for the quantitative recovery of both platinum and rhodium. The polyurethane foams are dissolved in hot nitric acid, followed by flame AAS. Near-quantitative recovery of these metals has been achieved by means of foam stripping using a suitable eluent. The rate of formation of the chloro-(trichlorostannato)platinum( II) complex anions is rapid when PtCl₄²⁻ is treated with an excess of tin( II) chloride. On the other hand, the reaction of cis-Pt(NH₃)₂Cl₂ with stannous chloride is very slow and forcing conditions are required to achieve quantitative sorption of the platinum(II)-tin( II) species by polyurethane foams for this complex The potential of the foam to selectively extract platinum from solutions containing certain base metals was studied. Results obtained show that in all cases complete extraction of platinum was achieved. Of the base metals investigated, namely Fe( III), Co( II), Ni(II), Cu(II) and Zn(II), only copper(II) co-extracts to a small extent with the noble metal. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemistry en_ZA
dc.title Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Chemistry en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Jones, L. (1987). <i>Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/17661 en_ZA
dc.identifier.chicagocitation Jones, Lynn. <i>"Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1987. http://hdl.handle.net/11427/17661 en_ZA
dc.identifier.vancouvercitation Jones L. Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17661 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jones, Lynn AB - The potentially quantitative and selective sorption of chloro-(trichlorostannato)-platinum(II) and -rhodium (III/I) complex anions by polyurethane foams has been examined. Quantitative separation of platinum(II) from iridium and ruthenium has been achieved. Rhodium( III) is similarly sorbed by polyurethane foam in the presence of sufficient tin(II) chloride and-its clean separation from iridium has been achieved using this method. Ruthenium, although not significantly sorbed under the same conditions as platinum and rhodium, appears to inhibit the extraction of the rhodium(III/I)-tin(II) species. A procedure has been developed for the quantitative recovery of both platinum and rhodium. The polyurethane foams are dissolved in hot nitric acid, followed by flame AAS. Near-quantitative recovery of these metals has been achieved by means of foam stripping using a suitable eluent. The rate of formation of the chloro-(trichlorostannato)platinum( II) complex anions is rapid when PtCl₄²⁻ is treated with an excess of tin( II) chloride. On the other hand, the reaction of cis-Pt(NH₃)₂Cl₂ with stannous chloride is very slow and forcing conditions are required to achieve quantitative sorption of the platinum(II)-tin( II) species by polyurethane foams for this complex The potential of the foam to selectively extract platinum from solutions containing certain base metals was studied. Results obtained show that in all cases complete extraction of platinum was achieved. Of the base metals investigated, namely Fe( III), Co( II), Ni(II), Cu(II) and Zn(II), only copper(II) co-extracts to a small extent with the noble metal. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam TI - Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam UR - http://hdl.handle.net/11427/17661 ER - en_ZA


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