Efe Ohwo

The spatial distribution, associated risks and sources of polycyclic aromatic hydrocarbons in sediment of the Oleri River in Delta State were examined in this study. Six sediments were obtained from six locations in the Oleri River and analyzed for the 16 priority PAHs using gas chromatograph coupled with mass spectrometry after extraction with dichloromethane and hexane. The levels of the ∑16-PAHs in the sediment ranged from 73.0-423 µg/kg. The higher molecular weight PAHs were the dominant PAHs in the sediments.

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.