Solvent extraction of lanthanide (ill) with dibenz0-[24]-crown-8 from aqueous picrate solution
| dc.contributor.author | Mohamed All, Abdussalam Salhin | |
| dc.date.accessioned | 2015-07-30T04:49:00Z | |
| dc.date.available | 2015-07-30T04:49:00Z | |
| dc.date.issued | 1994 | |
| dc.description.abstract | A systematic study of the extraction of fourteen metals, namely yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, erbium, thulium, ytterbium and lutetium, from picrate media [(N02)3.c6H2.0H] was carried out with dichloromethane solution containing various crown ethers namely, dibenzo-[24]-crown-8, dicyclohexano-[24]-crown-8 and dibenzo-[30]-crown-10. The optimum condition for the separation of these elements was studied. Solvent extraction of lanthanum (III) was studied in detail. The effects of the variables such as solvent selectivity, counter ion concentration, hydrogen ion concentration, ligand type and concentration, stripping agent type and concentration, time of extraction, time of equilibrium and the selectivity from other elements were discussed. Lanthanum (III) was quantitatively extracted from 2 X 10-4 M picric acid at pH from 8 to 9.2, with 0.02 M [DB24C8] in dichloromethane. The extracted '\ metal ion was stripped from the organic phase with various concentrations of nitric and perchloric acids. Perchloric acid was preferred as the suitable stripping agent (0.5 M). The extracted metal ion was determined by U.V.spectrophotometric method at 651.5 nm as its complex with arsenazo III (pH 3.2). The results showed that dichloromethane-[DB24C8] is the most suitable combination for quantitative ·solvent extraction of lanthanum (III). All other lanthanides were extracted at the optimum conditions of lanthanum. The selectivity of the elements from each other in the grou~ has been studied. Significant selectivity of lanthan urn from other lanthanides was observed. The developed method was tested to determine the amount of lanthanum (Ill) in the presence of other elements in monazite sand. The composition of lanthanum (III) as its oxide was found 22.60 ± 0.29 %, comparable to the reported values and the composition found by other methods. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/1022 | |
| dc.language.iso | en | en_US |
| dc.subject | Lanthanide | en_US |
| dc.subject | Aqueous picrate solution | en_US |
| dc.title | Solvent extraction of lanthanide (ill) with dibenz0-[24]-crown-8 from aqueous picrate solution | en_US |
| dc.type | Thesis | en_US |
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