Godswill O. Tesi

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.

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.

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.

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.