Dr. Stephen Kariuki

Stephen Kariuki Profile Photo
Associate Professor / Faculty of Arts and Science - Biology and Chemistry
Position
Full-time Faculty
Graduate Program Faculty
Office
H203
Extension
4430
About
Education
BEd, University of Nairobi
MSc, University of Nairobi
PhD, Ohio University
Research
Research Interests:

Dr. Kariuki's current interests include hydrometallurgy as well as a study of the effects of reduced sulphur species on water quality. The main goal of the hydrometallurgical research that we are performing is to develop more environmentally friendly and economical ways of mining minerals compared to the smelting processes that have traditionally been used.

An important part of the sulphur project is an investigation of the speciation of the reduced sulphur species in drinking water sources.

The above research is being carried out using a variety of techniques that include Atomic Absorption Spectroscopy (AAS), High Performance Liquid Chromatography (HPLC), and Voltametric techniques

Publications
  • ​Chlorate-based oxidative hydrometallurgical extraction of copper and zinc from copper concentrate sulfide ores using mild acidic conditions. S. Kariuki, C. Moore, A. M. McDonald, Hydrometallurgy, 96 2009 72–76.
  • N,N-Diethyl-p-phenylenediamine effectiveness in analysis of polysulfides and polythionates in water. S. Kariuki*, P. Babady-Bila, B. Duquette, Environ. Chem. 2008, 5, 226–230.
  • The role of oxidizing agents in hydrometallurgical extraction of sulpur-based minerals from low-grade ores containing large proportions of iron. S. Kariuki, C. M. Simpson, A. M. McDonald, Journal of Applied Global Research (JAGR), 2008, 1(2), 6-13
  • Analysis of commonly used antibiotics in acqueous samples: A review. S. Kariuki, J. Drouin, International Journal of Social Health Information Management (IJSHIM), 2008, 1(2), 1-11.
  • Analysis of ionic Polysulfides by Differential Pulse Polarography. S. Kariuki, M.J. Morra, K.J. Umiker, I.F. Cheng, Anal. Chim. Acta, 2001, 442, 277-285.
  • Electrochemical stability of copper in lithium-ion-battery electrolytes. M. Zhao, S. Kariuki, H.D. Dewald, F.R. Lemke, R.J. Staniewicz, E.J. Plichta, R.A. Marsh, J. Electrochem. Soc., 2000, 147 (8), 2874-9.
  • Current Oscillations of Indium(III) at a Dropping Mercury Electrode. S. Kariuki, H.D. Dewald, J. Thomas, R.W. Rollins, J. Electroanal. Chem., 2000, 486(2), 175-180.
  • Current Oscillations in the Reduction of Indium(III) and Gallium(III) in Dilute Chloride and Nitrate Solutions at the Dropping Mercury Electrode. S. Kariuki, H.D. Dewald, Electrochim. Acta, 1998, 43(7), 701-4.
  • Polarographic Determination of Diffusion Coefficient Values of In(III) in Potassium Chloride and Nitrate Supporting Electrolytes. S. Kariuki, H.D. Dewald, Talanta, 1997, 44(10), 1765-71.
  • Diffusion Coefficients of Gallium(III) in KNO3 and KCl Supporting Electrolytes. S. Kariuki, H.D. Dewald, Electroanalysis, 1997, 9, 231-4. Evaluation of Diffusion Coefficients of Metallic Ions in Aqueous Solutions. S. Kariuki, H.D. Dewald, Electroanalysis, 1996, 8, 307-13.