Abundances of Nitrates and Coliform with Regards to Water Quality. In Some Parts of lbadan, Southwest, Nigeria.
2012
Odukoya, Abiodun M. | Laniyan, T. A. | Ariyo, S. O.
Water pollution has been reported throughout the world and Nigeria is not an exception. A very wide range of pollutants have been recognized, including Nitrogen species and bacteria. Nitrate (NO.) is the main form of Nitrogen which occurs in water and is becoming increasingly widespread because of agriculture activities, the disposal of sewage and wastes. This study thus focused on the assessment of the water samples in Ibadan, .Southwest, Nigeria based on these two pollutants (NO,) and. Colform) and possibility of natural denitrification in the study area. The surface and groundwater in Ibadan h:w e been polluted by municipal, industrial wastewater, agricultural activities among others. 1 he nitrate and coliform concentrations at thirty sampling points with in Tbadan ranged from 5.89 to 250mg/l and 74-IOOOcfu/ lOOmg/1 respectively. The concentration of nitrate and califom1 exceeded the WHO limit of I Omg/1 and Ocfu/ lOOmg!r'in 93% and 1OQ% of the sampled locations respectively. High nitrate and califom1 ·levels were observed in water from wells from the undeveloped part of the smdv area. The decrease in nitrate concentration viz a viz an increase in both HCO,- and pH along the groundwater flow direction confirmed the possibility of nitrate removal or natural denitrification in the study area.
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