Solar UV-assisted sample preparation of river water for ultra-trace determination of uranium by adsorptive stripping voltammetry
Solar UV-assisted sample preparation of river water for ultra-trace determination of uranium by adsorptive stripping voltammetry
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DOI：
10.1007/s00604-012-0869-3
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发表时间：
2012-08
影响因子：
5.7
通讯作者：
Gelaneh Woldemichael;T. Tulu;G. Flechsig
中科院分区：
文献类型：
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作者：
Gelaneh Woldemichael;T. Tulu;G. Flechsig
本文介绍了如何利用太阳紫外线A辐射消解样品，用伏安法测定河水中的铀。采用吸附溶出伏安法（AdSV），以氯冉酸为络合剂。来自罗斯托克（德国）的Warnow河的样品用软太阳紫外线或来自发射254 nm光的30 W光源的人工硬紫外线进行预处理。样品照射12小时，两种方法得到相同的结果。我们能够在河水样本中检测到约1 μg·L− 1的铀（VI），该样本还含有更高mg·L− 1水平的溶解有机碳。在没有任何UV预处理的情况下，对于U（VI）没有获得AdSV信号。伪极谱实验证实了两种消化技术对AdSV响应的显著影响。该方法适用于自来水、泉水、地下水、海水、河水等沃茨中重金属的移动的超痕量伏安法测定。直接使用太阳辐射进行样品前处理是一种可持续的样品制备技术，不消耗大量化学品或能源。图a）原始样品b）6 h太阳紫外样品，c）12 h太阳紫外样品，d）6 h紫外样品中铀（VI）的吸附溶出伏安响应，标准加入量为2、4和6 μg·mL-1。给出了相对于Ag/AgCl（3 M KCl）的电势。
The article describes how solar ultraviolet-A radiation can be used to digest samples as needed for voltammetric ultratrace determination of uranium(VI) in river water. We applied adsorptive stripping voltammetry (AdSV) using chloranilic acid as the complexing agent. Samples from the river Warnow in Rostock (Germany) were pretreated with either soft solar UV or wit artificial hard UV from a 30-W source emitting 254-nm light. Samples were irradiated for 12 h, and both methods yielded the same results. We were able to detect around 1 μg·L−1of uranium(VI) in a sample of river water that also contained dissolved organic carbon at a higher mg·L−1levels. No AdSV signal was obtained for U(VI) without any UV pre-treatment. Pseudo-polarographic experiments confirmed the dramatic effect of both digestion techniques the the AdSV response. The new method is recommended for use in mobile ultratrace voltammetry of heavy metals for most kinds of natural water samples including tap, spring, ground, sea, and river waters. The direct use of solar radiation for sample pre-treatment represents a sustainable technique for sample preparation that does not consume large quantities of chemicals or energy.FigureAdsorptive stripping voltammetry response of uranium(VI) in a)Original Sampleb) 6 hSolar UV Sample, c) 12 hSolar UV Sample, and d) 6 hUV Samplewith standard additions of 2, 4 and 6 μg⋅L-1. Potentials are given vs. Ag/AgCl (3 M KCl).