Keywords
Abstract
This study was conducted to investigate the levels of some heavy metals (Arsenic, Cadmium, Chromium, Lead and Mercury) in Lagos Lagoon. Samples of water, sediments, and flesh of O. niloticus were collected monthly between May 2017 and February 2018 from Makoko, Majidun and Bayeku segment of the Lagoon. The results showed high mean concentrations of Turbidity, Total Suspended Solids and Total Dissolved Solids across the stations (5NTU, 4881.8±1801.04mg/L, and 804±90.146mg/L respectively). Makoko recorded the lowest (6.0) pH levels and highest (15 mg/L) Biochemical Oxygen Demand. The highest level of Arsenic (0.012 ± 0.003mg/kg), Chromium (0.009 ± 0.000 mg/kg) and Lead (0.042 ± 0.007mg/kg) in O. niloticus flesh were recorded Makoko segment, while Bayeku had higher (0.011 ± 0.004mg/kg) level of Cadmium in all the three stations. The mean concentration of heavy metals in sediments ranged from Arsenic (0.009 ± 0.004mg/kg to 0.011 ± 0.004mg/kg), Cadmium (0.007 ± 0.003mg/kg to 0.020 ± 0.012mg/kg), Chromium (0.007 ± 0.003mg/kg to 0.013 ± 0.007mg/kg), and Lead (0.012 ± 0.002mg/kg to 0.075 ± 0.030mg/kg), while Mercury was generally below detectable levels. This study indicated that concentrations of heavy metals are increasing, most especially in Makoko and Bayeku. However, fish from these stations had Cadmium and Arsenic that exceeded the maximum permissible limits set by WHO for drinking water, hence pose health risk. However, it is advisable that domestic and industrial users treat their wastes before discharge into the lagoon while governments should re-enforce pollution control and discharge regulations.
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