The application of visible absorption spectroscopy to the analysis of uranium in aqueous solutions
The application of visible absorption spectroscopy to the analysis of uranium in aqueous solutions
复制标题
可见光吸收光谱在水溶液中铀分析中的应用
DOI：
10.1016/j.talanta.2017.07.051
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发表时间：
2017
期刊：
影响因子：
6.1
通讯作者：
Rowley, J.
中科院分区：
文献类型：
--
作者：
Colletti, L.M.;Copping, R.;Garduno, K.;Lujan, E.J.W.;Mauser, A.K.;Mechler-Hickson, A.;May, I.;Reilly, S.D.;Rios, D.;Rowley, J.
通过在固定温度下对过量的1M H_2SO_4进行分析，发展了一种可见吸收光谱分析铀浓度的技术，其分析浓度范围为1.8-13.4 MGU/g。一旦对特定的分光光度计和一组光谱池实施，该技术有望比经典的Davies-Gray(DG)滴定分析方法提供更快的结果。虽然不像DG方法那样准确和精确，但对比分析研究表明，光谱分析方法可以分析特性良好的铀酰(VI)溶液样品中的铀，分析结果的精度不超过DG结果的0.3%。对于样品纯度不太明确的未知铀溶液，改进的光谱分析方法与DG分析的一致性在0.5%以内。该技术还可用于检测影响比色分析的杂质的存在，通过对Ru污染的分析证实了这一点。最后，将该技术推广到其他分析溶液，1M HNO3，HCl和Na2CO3，也被证明是可行的。在四种水溶液中，碳酸盐溶液在最强烈的吸收带产生最大的摩尔吸光系数，受温度的影响最小。
Through assay analysis into an excess of 1 M H2SO4at fixed temperature a technique has been developed for uranium concentration analysis by visible absorption spectroscopy over an assay concentration range of 1.8–13.4 mgU/g. Once implemented for a particular spectrophotometer and set of spectroscopic cells this technique promises to provide more rapid results than a classical method such as Davies-Gray (DG) titration analysis. While not as accurate and precise as the DG method, a comparative analysis study reveals that the spectroscopic method can analyze for uranium in well characterized uranyl(VI) solution samples to within 0.3% of the DG results. For unknown uranium solutions in which sample purity is less well defined agreement between the developed spectroscopic method and DG analysis is within 0.5%. The technique can also be used to detect the presence of impurities that impact the colorimetric analysis, as confirmed through the analysis of ruthenium contamination. Finally, extending the technique to other assay solution, 1 M HNO3, HCl and Na2CO3, has also been shown to be viable. Of the four aqueous media the carbonate solution yields the largest molar absorptivity value at the most intensely absorbing band, with the least impact of temperature.