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Advances in Chemistry
Volume 2014 (2014), Article ID 938419, 7 pages
Research Article

Solar UV-Assisted Pretreatment of River Water Samples for the Voltammetric Monitoring of Nickel and Cobalt Ultratraces

1School of Natural Science, Adama Science and Technology University, Adama, Ethiopia
2School of Science and the Environment, Manchester Metropolitan University, Manchester M1 5GD, UK
3Gensoric GmbH, Schillingallee 68, 18057 Rostock, Germany
4Department of Chemistry, University of Rostock, 18059 Rostock, Germany

Received 29 April 2014; Revised 17 June 2014; Accepted 17 June 2014; Published 21 July 2014

Academic Editor: Mohamed Sarakha

Copyright © 2014 Gelaneh Woldemichael and Gerd-Uwe Flechsig. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The application of solar UV radiation as sample digestion method is reported. The method is employed in adsorptive stripping voltammetric determination of nickel and cobalt in river water samples. The river water samples were collected from downstream of Warnow River (Germany) and acidified to pH of by addition of ultrapure 65% HNO3. Furthermore, 3.4 mgL−1 ultrapure hydrogen peroxide solution was added to the samples as photochemical reaction initiator. The samples were transferred to UV-A transparent polyethylene terephthalate bottles and put in the sunshine for UV irradiation for six and 12 hours at a UV-A intensity of 3.90 mW/m2. The comparison of the concentration values showed that, 6 hours of solar UV irradiation at 3.90 mW/m2 UV-A intensity is not sufficient to complete the digestion process though it yields much better results than the undigested original sample. However, 12 hours of solar UV-A irradiation under similar conditions is almost as effective as a 30 W artificial UV lamp (254 nm) and can be applied to the digestion of dissolved organic carbon in trace nickel (II) and cobalt (II) analysis in natural waters such as river water, lake waters, and well waters.