Highly accurate determination of trace amounts of uranium in standard reference materials by spectrophotometry with chlorophosphonazo III after complete separation by anion and cation exchange chromatography
| Autor: | F.W.E. Strelow, T. N. van der Walt |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Chromatography
Trace Amounts medicine.diagnostic_test Elution Clinical Biochemistry Ion chromatography technology industry and agriculture chemistry.chemical_element Hydrochloric acid General Medicine Uranium Analytical Chemistry Ion chemistry.chemical_compound chemistry Spectrophotometry Acetone medicine General Materials Science |
| Zdroj: | Fresenius' Zeitschrift für analytische Chemie. 306:110-114 |
| ISSN: | 0016-1152 |
| DOI: | 10.1007/bf00482081 |
| Popis: | A method is described for the highly accurate determination of trace amounts of uranium in standard reference materials. The uranium is separated from the bulk elements by anion-exchange chromatography, eluting most elements with 6 M hydrochloric acid and iron(III) with 0.5 M hydrochloric acid in 90% acetone. After elution of uranium with 0.1 M hydrochloric acid, residual traces of other elements are separated by a very selective cation-exchange procedure using a 3 g resin column. Finally the uranium is determined in the hexavalent state by spectrophotometry at 672 nm of its complex with chlorophosphonazo III at pH 1.1±0.2 in the presence of DTPA. Results are very accurate and precise even on a semi-routine basis. Relevant elution curves and results are presented for recovery tests and for the analysis of the 10 South African UREM standard materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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