Abstract
This study was carried out to assess the level of heavy metals pollution in Ologe Lagoon, Agbara, Lagos, Nigeria. The Lagoon receives effluents from industries in the Agbara Industrial Estate. Cored Soft sediments were retrieved from six random sampling points within the Lagoon and labeled (S1, S2, S3, S4, S5 and S6). Subsamples of the sediments were prepared and analyzed for heavy metal concentration. The result from the heavy metal analysis of the sediments shows that average concentration of Mn, Zn, Cr, Ni, Cr, Ni, Co, Cu and Pb in the samples was 278.1 ppm, 21.7 ppm, 14.2 ppm, 6.6 ppm, 6.4 ppm, 6.4 ppm and 4.4 ppm, respectively. The correlation between the heavy metals varies from 0.71 to 0.98 shows that they have a strongly positive degree of association which suggests that they are from the same source. The geo-accumulation values for Cu in all stations ranged between (1 - 2.8 ppm) and it can be deduced that the sediments are moderately to strongly polluted. Pb varies between 1 and 2.1 suggesting that the sediments are moderately polluted. Zn exhibits strong pollution levels with a range from 2.5 and 3.5 ppm. Co is moderately polluted with 1.5 - 2.4 while Mn shows the highest level of pollution in all stations with Igeo values ranging between 4.1 and 5.8. This study showed that the Lagoon accumulates heavy metals as a result of anthropogenic activities evident in the dumping of municipal, sewage, industrial waste in the environment and domestic activities such as auto mobile transportation and mechanic repair workshop. Based on sediment quality guidelines, the Ologe Lagoon level of pollution ranged from Cu > Pb > Zn > Ni > Co > Mn > Cr > Al with Mn having the highest level of pollution.
Highlights
The rapid growth of industrialization and population in Nigeria has brought about the problem of pollution in the natural environment
The aim of this study is to assess the level of heavy metal pollution using sediments from Ologe Lagoon, Lagos State, Nigeria
The heavy metal ranges for the average concentrations in the stations are Cu (2.63 - 18.63 ppm), Pb (2.08 - 9.98 ppm), Zn (15.50 - 45.00 ppm), Ni (2.50 - 17.60 ppm), Co (3.23 12.53 ppm), Mn (70.50 - 839.50 ppm) and Cr (4.58 - 39.20 ppm)
Summary
The rapid growth of industrialization and population in Nigeria has brought about the problem of pollution in the natural environment. Heavy metals toxicity and distribution in wetlands can disrupt the ecosystem of the soil and that of the aquatic flora and fauna which depend on it and in turn pose a threat to human health (Loizidou et al, 1992). Metals such as copper (Cu), chromium (Cr), Zinc (Zn), Iron (Fe) and Manganese (Mn) are essential micronutrients required for plant and animal metabolism but can become toxic at high concentrations (Bryan, 1976). The aim of this study is to assess the level of heavy metal pollution using sediments from Ologe Lagoon, Lagos State, Nigeria
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