Solar UV-assisted sample preparation of river water for ultra-trace determination of uranium by adsorptive stripping voltammetry
- 182 Downloads
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−1 of uranium(VI) in a sample of river water that also contained dissolved organic carbon at a higher mg·L−1 levels. 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.
KeywordsUranium River water Adsorptive stripping voltammetry (AdSV) Chloranilic acid UV digestion Pseudopolarography
The authors are grateful to the German Research Foundation (DFG, FL 384/7-1, Heisenberg Fellowship) and the German Academic Exchange Service (DAAD) for financial support.
- 1.Busby C, Schnug E (2008) Advanced biochemical and biophysical aspects of uranium contamination. In De Kok LJ, Schnug E (eds) Loads and fate of fertilizer derived uranium. Backhuys Publishers, Leiden, The Netherlands, ISBN/EAN 978-90-5782-193-6Google Scholar
- 4.Domingo JL (1995) Chemical toxicity of uranium. Toxicol Ecotoxicol News 2:74–78Google Scholar
- 25.Sipos L, Golimowski J, Valenta P, Nurnberg HW (1979) New voltammetric procedure for the simultaneous determination of copper and mercury in environmental samples. Fres Z Anal Chem 298:1–8Google Scholar
- 27.Woldemichael G, Tulu T, Flechsig GU (2011) Solar UV photooxidation as pretreatment for stripping voltammetric trace metal analysis in river water. Int J Electrochem 2011: article ID 481370, 7 pagesGoogle Scholar
- 28.Woldemichael G, Tulu T, Flechsig GU (2012) Application of solar UV radiation for pre-treatment of river water samples in the determination of nickel and cobalt ultratraces by adsorptive stripping voltammetry. Submitted to Int J Environm Anal ChemGoogle Scholar
- 31.Metrohm Application Bulletin No. 266/1, www.metrohm.com