Department of Environmental and Occupational Studies;
Faculty of Applied Sciences;
Cape Peninsula University of Technology;
PO Box 652;
Cape Town 8000;
South Africa;
Department of Chemistry;
Faculty of Applied Sciences;
Cape Peninsula University of Technology;
PO Box 652;
Cape Town 8000;
South Africa;
Department of Chemistry;
Faculty of Natural and Agricultural Sciences;
University of Pretoria;
Private Bag X20;
Hatfield;
Pretoria 0028;
South Africa;