_____________________________________________________________________________________________________ *Corresponding author: E-mail: owhonda.ihunwo@hotmil.co.uk; Advances in Research 22(1): 100-110, 2021; Article no.AIR.64634 ISSN: 2348-0394, NLM ID: 101666096 FactSage Modelling of Pb and Ni Speciation in Surface Water from Woji Creek, Rivers State, Nigeria Millicent U. Ibezim-Ezeani 1,2 and Owhonda C. Ihunwo 2* 1 Department of Pure and Industrial Chemistry, University of Port Harcourt, P.M.B. 5323, Choba, Rivers State, Nigeria. 2 Niger Delta Aqua Research Group, Department of Biochemistry and Chemistry Technology, School of Science Laboratory Technology, University of Port Harcourt, P.M.B. 5323, Choba, Rivers State, Nigeria. Authors’ contributions ‘This work was carried out in collaboration between both authors. Author MUI-E designed the study and wrote the first draft of the manuscript. Author OCI performed the statistical analysis and wrote the protocol. Authors MUI-E and OCI managed the software analysis and literature searches. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/AIR/2021/v22i130292 Editor(s): (1) Dr. Elly Josephat Ligate, Sokoine University of Agriculture, Tanzania. Reviewers: (1) Muhammad Ghazanfar Ali, PCSIR Laboratories Complex Karachi, Pakistan. (2) S. Arumugam, Thiruvalluvar University, India. Complete Peer review History: http://www.sdiarticle4.com/review-history/64634 Received 27 November 2020 Accepted 03 February 2021 Published 01 April 2021 ABSTRACT The present study is designed to use FactSage version 7.3 to simulate and predict the ionic speciation of lead (Pb) and nickel (Ni) in surface water sampled from Woji creek in Rivers State, Nigeria. Along the 3 km stretch (stations 1 to 5) of Woji creek, in-situ records were taken for temperature, pH and electrode potential (Eh); surface water samples to be assessed for Pb and Ni were collected in sterile bottles. Along the creek, surface water Eh is in the order: station 2 > station 4 > station 5 > station 3 = station 1, with mean value of Eh as 140 ± 20 mV. Surface water pH was close to neutral, and in line with: station 4 > station 2 > station 5 > station 1 > station 3; with 6.81 ± 0.13 as the mean value of pH. The trend of temperature values was recorded as: station 1 > station 2 = station 3 = station 4 > station 5; with the mean value deduced to be 25.6 ± 0.4. Mean concentration of Pb and Ni across the creek were 0.92 ± 0.27 mg/l and 0.46 ± 0.23 mg/l respectively. Pb species exists predominantly in the forms: Pb 6 (OH) 8 4+ (aq) (45%), Pb 4 (OH) 4 4+ (aq) (45%). Other forms of Pb present in the surface water are PbO (s) (5%), PbO 2(s) (4%) and Pb 2+ (aq) Original Research Article