Godswill O. Tesi

Phthalate Esters in Raw and Finished Water from Drinking Water Treatment Plants and Human Exposure in Songkhla, Southern Thailand

The presence of phthalate esters (PEs) in water treatment facilities has drawn a lot of interest because of the possible health risks. This research provide data on 6 PEs in the raw and finished water of three waterworks located in Songkhla Province, southern Thailand. Given that drinking water is a major way that people can be exposed to PEs, the fate of target PEs in the three conventional drinking water treatment plants was also analyzed.
AuthorName(s)
Kingsley E. Okpara
Godswill O. Tesi

Occurrence and Human Health Risk Assessment of Phthalate Esters in Sediments from a Riverine in Southern Thailand

Phthalate esters (PAEs) are environmentally active organic pollutants that can cause endocrine disruption in humans. This study evaluated the human health risk associated with the dermal exposure to the levels of six common PAEs in sediments collected from U-Tapao River. A gas chromatograph/mass spectrometer (GC–MS) analytic method was used for the identification and quantification of PAEs. The human health risk was carried out using hazard quotient (HQ) and hazard index (HI).
AuthorName(s)
Godswill O. Tesi
Kingsley E. Okpara

Concentrations, Ecological and Health Risk Assessment of Heavy Metals in Surface Water and Sediments of Ogun River in Owode Onirin,

Industrial processes, including scrap yards, can contaminate surface waters with heavy metals, posing a risk to aquatic habitat and human health. Thus, the concentrations, ecological and health risks of heavy metals in surface water and sediment of the Ogun River in Lagos was investigated. Surface water and sediments collected from the Ogun River were analyzed for some physicochemical parameters and heavy metals using standard procedures.
AuthorName(s)
Kingsley E. Okpara
Edwin Isotu-Edeh
Anim E. Ujong
Godswill O. Tesi
Esther Okpara

Organochlorine Pesticides in Soils of Municipal Solid Waste Dumpsites in Delta State: Spatial and Seasonal Variations, Potential Risks and Sources

This study assessed the spatial and seasonal variations, potential risks and sources of organochlorine pesticides in municipal solid waste dumpsites (MSWDs) in Delta State. Soil samples were obtained from twenty-seven MSWDs in Delta State. Soil samples were extracted with hexane/dichloromethane and cleaned up in a column of silica gel and florisil. The OCPs in the extracts were quantified with a gas chromatograph-mass spectrometry (GC-MS). The ∑20 OCPs levels in the soils varied between 0.74 and 7.29 ng g-1for the dry season and from 0.09 to 9.47 ng g-1 for the wet season.
AuthorName(s)
Efe Ohwo
Godswill O. Tesi
Lawson Onojake
Austin Ojakovo
Onoriode O. Emoyan
Temi E. Akporhonor

Distribution and Risk of Metals in Soils of Refuse Dumpsites in Some Urban Towns in Delta State, Nigeria

Refuse dumpsites often contain materials capable of polluting surrounding soils. In this study, the spatial distribution of metals in soils of refuse dumpsites in three urban towns (Ughelli, Sapele, Orhuwhorun) in Delta State, Nigeria were examined. Soil samples were collected from three dumpsites in the aforementioned towns at depths 0-15 cm, 15-30 cm and 30-45 cm, respectively.

AuthorName(s)
Godswill O. Tesi
Joshua O. Ojegu
Samuel O. Akporido

Air Pollution Tolerance Index of Selected Plants around a Gas Flow Station in Sapele, Delta State

This study assessed the air pollution tolerance index (APTI) of four plants around the Seplat Gas Flow Station in Sapele, Delta State. Fresh leaves of the plants were collected, weighed, dried and extracts were made. Standardized procedures for determining APTI were adopted. The physio-biochemical characteristics of the four plant species ranged from; pH 4.57–5.36, chlorophyll content 0.17-0.45 mg/g, RWC 41.0%–80.0%, ascorbic acid: 0.91 – 1.58 mg/g, while APTI varied from 5.75 – 6.99.

AuthorName(s)
Grace E. Obi-Iyeke
Godswill O. Tesi

Heavy Metal Content and Health Risk Assessment of Jams Consumed in Nigeria

The content and risk of nine heavy metals (Cd, Pb, Ni, Cr, Cu, Co, Mn, Zn and Fe) were quantified and assessed in jams consumed in Nigeria. The heavy metal contents were quantified using atomic absorption spectrometry (AAS) after digesting jam samples with mixture of acids. The quantified content (mg/kg) of the heavy metals in the jams ranged from <0.03 for Cd, < 0.25 for Pb, 0.05-1.55 for Ni, < 0.25-0.50 for Cr, 0.75-7.75 for Cu, <0.25-0.50 for Co, <0.25- 13.3 for Mn, <2.00-14.0 for Zn and 13.1-30.8 for Fe.

AuthorName(s)
Godswill O. Tesi
Grace Obi-Iyeke
Omotekoro S. Emakunu
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