Bioaccumulation of Polycyclic Aromatic Hydrocarbons and Heavy Metals in Selected Crops from Tebidaba, Bayelsa State, Nigeria
Zikenah, E. C.
MetadataShow full item record
The levels of polycyclic aromatic hydrocarbons (PAHs), trace metals, enzyme activities and physicochemical properties of polluted soil samples from Tebidaba, Southern Ijaw Local Government Area, Bayelsa State, Nigeria were investigated using standard procedures. The result of the physicochemical analysis revealed that the pH of the polluted soil sample was slightly more acidic than the control from Mbieri, Mbaitoli Local Government Area of Imo State. In contrast, the results of the conductivity, phosphate, sulphate and nitrate of the test soil were slightly lower than those of the control soil. Heavy metal levels in both test soil and crops increased. High levels of PAHs were detected in the test soil and crops while the control samples were free from PAH contamination. Enzymes such as alkaline phosphatase (ALP), acid phosphatase (ACP) and lactate dehydrogenase (LDH) were also assayed and was found to decrease in the test samples when compared to their activities in the control samples. Acid phosphatase activity was found to be 2.23 IU/L (for test soil) and 7.02 IU/L (for control soil). That of alkaline phosphatase was 0.101 IU/L (for test soil) and 2.84 IU/L (for control soil) and soil dehydrogenase activity was 0.9×10-7 IU/L (for test soil) and 1.8×10-5 IU/L (for control soil). Enzymatic activity in the crops followed the same trend. Considering the Department of Petroleum Resource standards for PAHs, physico-chemical parameters and heavy metals, results for test samples were significantly different and this is indicative of pollution. In conclusion, crude oil pollution has had a chronic effect on soil and crops from this area but from the results, plantain seems to thrive better than the other crops.