title: Phytoassessment of a waste engine oil-polluted soil exposed to two different intervals of monitored natural attenuation using African yam bean (Sphenostylis stenocarpa).
abstract: The present study comparatively investigated the phytotoxic effects of waste engine oil (WEO)-polluted soil exposed to monitored natural attenuation up to 5 and 14 months respectively. Soil was previously polluted with WEO at 0, 1, 2.5, 5 and 10% w/w oil in soil. Although, there was significant reduction in heavy metal concentration of soil as well as total hydrocarbon contents, performance of Sphenostylis stenocarpa was greatly retarded when sown at 5 months after pollution (MAP), with death of all seedlings except in the control. However, growth and yield performances were significantly (p > 0.05) enhanced at 14 MAP. Computation of hazard quotient showed that ecological risk factor initially posed by the presence of heavy metals in the soil at 5 MAP was significantly (p > 0.05) reduced to safe levels at 14 MAP.
authors: Department of Plant Biology and Biotechnology, University of Benin, Nigeria.
authors: B
authors: B
authors: Ikhajiagbe
authors: Department of Plant Biology and Biotechnology, University of Benin, Nigeria.
authors: G O
authors: GO
authors: Anoliefo
authors: Raw Materials Research and Development Council, Abuja, Nigeria.
authors: M A
authors: MA
authors: Jolaoso
authors: Department of Plant Biology and Biotechnology, University of Benin, Nigeria.
authors: E O
authors: EO
authors: Oshomoh
mesh_terms: D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution / Q000032:analysis*; D006838:Hydrocarbons / Q000032:analysis / Q000493:pharmacokinetics; D007219:Industrial Oils / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis / Q000493:pharmacokinetics; D012307:Risk Factors; D036226:Seedlings / Q000254:growth & development / Q000378:metabolism; D012639:Seeds / Q000254:growth & development / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000493:pharmacokinetics; D031303:Sphenostylis / Q000254:growth & development* / Q000378:metabolism*
chemical_list: D006838:Hydrocarbons; D007220:Industrial Waste; D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants