کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
217458 | 1426331 | 2006 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: An application of the total measurement uncertainty budget concept to the thermodynamic data of uranyl (VI) complexation by sulfate An application of the total measurement uncertainty budget concept to the thermodynamic data of uranyl (VI) complexation by sulfate](/preview/png/217458.png)
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 UO2SO4and(UO2)2(OH)22+. 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 (UO2)2(OH)22+, 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.
Journal: The Journal of Chemical Thermodynamics - Volume 38, Issue 11, November 2006, Pages 1274–1284