Van Staden, J.F.2024-11-272024-11-2722/02/161992http://hdl.handle.net/2263/99495Dissertation (MSc (Chemistry))--University of Pretoria, 1992.The metals cadmium, chromium, copper, iron, mercury, manganese, molybdenum, nickel, titanium, vanadium, zinc, aluminium and the non-metals arsenic and boron are discussed from a theoretical viewpoint with specific attention to their presence in nature, as well as their mobility and availability with pH variation. A project was initiated to determine the possibility of pollution by the metals from the sediment to the water phase in the Koekemoerspruit/Orkney area of the Vaal River catchment. This was done by firstly doing a total digestion procedure, and secondly by using a pH-dependent sequential extraction procedure.Afr© 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.Geselekteerde metaleRiviersedimentepH-afhanklike ekstraksieprosedureUCTDDissertation