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DETERMINATION OF EUTROPHICATION INDICES OF SURFACE WATERS OF ABUJA- NIGERIA

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DETERMINATION OF EUTROPHICATION INDICES OF SURFACE WATERS OF ABUJA- NIGERIA

 

 

Abstract: This research work investigates the eutrophication status of the surface water of Abuja –Nigeria. Surface water samples were collected using 1000ml HDPE bottles and analyzed for a period of six months in five different sites. The concentration of nitrate nitrogen (NO3-N), phosphorus (PO4 3-) and the COD were analyzed using standard procedure. Temperature, pH, electrical conductivity (EC), and total dissolved solids (TDS) were measured in situ during sampling. The results show the BOD value ranged from 3.10 at Site 5 to 40.30 at Site 4 (Figure 1). Sites 1-4 had BOD greater than 5 mg/l in October and hence rich in organic waste and prone to eutrophication. The highest value of COD was recorded in Site 4 in with a value of 86.000 ± 0.000 while the lowest value of 8.000 ±1.000 was recorded at Site 5 which is a Dam. The nitrate level ranged from 0.400 ±0.100 at Site 5 to 7.70±0.100 mg/l at Site 3. Potassium concentration ranged from 0.220 ±0.000 at Site 5 to 10.98 ±0.000 at Site 3. The pH ranged from 3.0 to 6.4. The highest value of TDS was recorded in Site 1 with a value of 1222mg/l ± 0.00 while Site 5 recorded the lowest value of 86.20 ± 0.00 mg/l. The eutrophication indices monitored shows that eutrophication is at its early stage in the Abuja surface water. Keywords: Eutrophication, BOD, water pollution, surface water, Abuja