1. Department of Chemical and Forensic Sciences, Botswana International University of Science and Technology, Biust, Palapye, Botswana
2. Department of Crop Science and Production, Botswana University of Agriculture and Natural Resources, Private Bag 0027, Gaborone, Botswana
3. Safety Health and Environment, Botswana Defence Force, Bdf, Sir Seretse Khama Barracks, Private Bag x06, Mogoditshane, Botswana