Institution: | 1.Department of Chemistry, Maseno University, P.O. Box 333-40105, Maseno, Kenya ;2.Department of Geochemistry and Environmental Chemistry, School of Chemistry and Material Science, Technical University of Kenya, P.O. Box 52428-00200, Nairobi, Kenya ;3.School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa ; |