Comparative Analysis of Groundwater Quality of Island and Mainland Areas of Lagos State, Nigeria

Authors: Adewumi JR

DOI Info: N/A

ABSTRACT

This paper compares the physical, chemical and biological quality of boreholes water from 25 locations in Lagos Island and Mainland. Laboratory analyses were conducted using Standard Methods of Water Analysis. The results of the physical characteristics show that the temperature (21.6 – 28.3 ^oC) and total dissolved solids (TDS) (86.5 – 150.1 mg/l) values recorded for both Island and Mainland were within the stipulated values. Statistical analysis revealed that a significant difference exists between the dissolved solids (p = 0.002) and no significant difference in the temperature (p = 0.196), total solids (p = 0.151) and turbidity (p = 0.597) of the tested sample. The turbidity values obtained for all water samples (5.80 – 14.20 mg/l) were well above the specified standards (5.00 mg/l). The pH and conductivity values were within the recommended values. The statistical analysis of chemical parameters revealed that a significant difference exists in the chloride concentration (p = 0.001), pH (p = 0.032) and conductivity (p = 0.001) of the water samples. It should be noted that the values obtained in the Island are higher than the values obtained from mainland. The total coliform obtained are within permissible limit. It was observed that the dissolved solid, conductivity and chloride values obtained in island were higher than the values obtained from mainland. This could be attributed to the close proximity of Island to ocean which could be as a result of salt water intrusion. In other to safeguard the health and wellbeing of the users, groundwater from Inland and Mainland of Lagos metropolis need be treated to remove excess chloride and total dissolved solid before use.

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