ONWORDI Chionyedua Theresa

Meet ONWORDI Chionyedua Theresa, an Academic Staff of Lagos State University.


Analytical/environmental Chemistry


Associate Professor / Reader




At the Chemistry department office

Visiting Hour

Appointment on Visitation important

Research Interest

Topic: Evaluation Of The Organochlorine Pesticide Residues Present In Selected Brands Of Carbonated Drinks Sold In Nigeria And Their Risk To Human Health

Description: INTRODUCTIONPesticide is defined as a chemical compound that is used to kill pests, including insects, rodents, fungi and unwanted plants. Pesticides are used in the cultivation of crops to prevent or control pests and other pathogens responsible for losses and low-quality produce. Therefore, they improve both yield as well as the quality and appearance of the agricultural produce.AIM AND OBJECTIVESAIMThe aim of this study is to evaluate the Organochlorine Pesticide residue present in selected brands of carbonated drinks sold in Lagos, Nigeria and their risk to human health.OBJECTIVES1. To evaluate levels of OCP residues in carbonated drinks2. To assess health risk of people consuming OCP contaminated drinks.3. To evaluate the level of compliance to WHO provisional guidelines 4. Identify the factors that contribute to the presence of OCPs in carbonated drinks.METHODOLOGYSeveral brands of locally produced carbonated drinks will be randomly chosen out of various brands available for sales in Lagos State, South west, Nigeria markets. Two samples of each brand having different batch numbers will be purchased. The extraction procedure and the clean up for OCPs will be done by standard methods. The extracts will be analyzed using Gas Chromatography-Electron Capture Detector (GC-ECD). The Health Risk Assessment will be assessed by calculating the health risk index (HRI).EXPECTED RESULTSTo identify brands of carbonated drinks that have high levels of OCPs; to calculate the health risk associated with the consumption of the drinks.CONTRIBUTION TO KNOWLEDGETo inform the regulatory bodies on the possible level of OCPs in carbonated drinks sold in Lagos, Southwest, Nigeria.


# Certificate SchoolYear
1. Ph.D (Analytical/Environmental Chemistry) University of Ibadan, Ibadan, Nigeria 2014

Current Research


Research Details

INTRODUCTIONSeveral industries generate wastewater that are not or partially treated and are highly loaded with pollutants such as dye, which is directly introduced into the ecosystem. About 15% of the world production of dyes is lost during dyeing process and released, as effluent. Current wastewater treatment technology cannot sufficiently remove dye from synthetic solutions, hence new and low-cost technology is needed..AIM and OBJECTIVESThe study aimed at using agricultural waste materials (AWMs) otherwise known as biopolymer such as corncob, bean husk, fish scale and melon husk to remove dyes (methylene blue and Rhodamine 6G) from synthetic solutions.OBJECTIVES1. Optimization of the pH, dosage, concentration, time and temperature variation of the dyes from the simulated solutions using batch adsorption process. 3. Determination of the mode of adsorption using the Freundlich, Langmuir and Temkin isotherms.4. Investigation of the adsorption kinetics and thermodynamics.METHODOLOGYThe various biopolymers materials were sorted, dried, pulverised, and sieved with 2 mm mesh size stainless steel sieve. The optimisation of the following variables: pH, adsorbent dosage, initial metal concentration, contact time and temperature were done by exploiting the Onwordi et al 2017 method. The Langmuir, Freundlich and Temkim Isotherm models were used to analyze the equilibrium data. The kinetic data was analysed using pseudo-first-order and pseudo-second-order model. Thermodynamic study such as entropy, enthalpy and Gibb’s free energy were conducted to explain the adsorption mechanisms.EXPECTED RESULTS The batch process for the dyes had been done using the AWMs and the results indicated that the AWMs have a good potential for removing the dyes from the synthetic solution.CONTRIBUTION TO KNOWLEDGEThe agricultural waste materials can be used in the removal of dyes from wastewater. The research will address the goal 6 of SDG that addresses clean water and sanitation for all.


ONWORDI Chionyedua is a Associate Professor / Reader at the Department of Chemistry

ONWORDI has a Ph.D in Analytical/Environmental Chemistry from University of Ibadan, Ibadan, Nigeria

The Numbers Say it AllWhy Choose Us