An application of the total measurement uncertainty budget concept to the thermodynamic data of uranyl (VI) complexation by sulfate
| Autor: | Zbigniew Glatty, G. Meinrath, Zbigniew Piskuła, Stefan Lis |
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| Rok vydání: | 2006 |
| Předmět: |
Multivariate statistics
Aqueous solution Inorganic chemistry chemistry.chemical_element Thermodynamics Uranium Uranyl Atomic and Molecular Physics and Optics Chemometrics chemistry.chemical_compound chemistry Stability constants of complexes Measurement uncertainty General Materials Science Physical and Theoretical Chemistry Sulfate |
| Zdroj: | The Journal of Chemical Thermodynamics. 38:1274-1284 |
| ISSN: | 0021-9614 |
| DOI: | 10.1016/j.jct.2006.02.010 |
| Popis: | On the basis of UV–Vis absorption spectra from 33 aqueous solutions with a multivariate composition in uranium (VI), sulfate, and hydroxide, the evaluation of a complete measurement uncertainty budget of relevant physicochemical quantities describing the system is performed. The analysis was performed by threshold bootstrap computer-assisted target factor analysis and revealed the presence of the species UO 2 SO 4 and ( UO 2 ) 2 ( OH ) 2 2 + . The analytical procedure is scrutinized to identify and quantify relevant influence factors on the basis of cause-and-effect analysis. The complete measurement uncertainty budgets are obtained as empirical cumulative distribution functions, which show a marked non-Normality. Evidence is given that the apparent discrepant results reported in the literature, especially for formation constants of species ( UO 2 ) 2 ( OH ) 2 2 + , are not a result of faulty experimentation but of neglect of relevant uncertainty contributions. Thus, reliability has been considerably overestimated – making the results of different independent studies incompatible. |
| Databáze: | OpenAIRE |
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