24:T512,Toxicological effects of sub lethal concentrations of lead and zinc salts (Pb(NO₃)₂ and ZnCl₂) on the antioxidant enzymes of post juvenile Clarias gariepinus in laboratory bioassays was investigated, using the liver. Oxidative stress enzymes and substrates (Glutathione-S-Transferase (GST), Glutathione (GSH), Superoxide dismutase (SOD), and Catalase (CAT) ) showed irregular activities during the first two weeks of the experiment, but a significant variation (p<0.05) from levels detected in controls after 28 days in fishes exposed to both metals. Increased levels of GST-GSH and reduced levels of SOD and CAT occurred in fishes exposed to ZnCl₂ as compared to control while there were no variations in the levels of Malondialdehyde (MDA). In fishes exposed to Pb(NO₃)₂ however, GST-GSH, SOD, CAT and MDA all reduced when compared to control. There is need for more research on the oxidative defense response of Clarias gariepinus to persistent levels of high concentrations of heavy metals .There is also a need for comparison of existing field and laboratory studies so as to fully exploit the bio markers of oxidative stress as indicators of environmental pollution in tropical fresh water systems.25:T4f6,To evaluate the extent of heavy metals (Cd, Cr, Pb, Zn, Fe) contamination from e-waste, surface dust samples were collected from workshops (indoor), around the market areas (outdoor) and from a distance of about 100 metres away from the market area (control) of the Westminister Electronic market in Lagos, Nigeria. Aqua regia digestion was applied to the dust samples prior to determination of heavy metal by atomic absorption spectroscopy (AAS). The AAS analysis revealed mean concentrations in indoor dust (Pb 22.50, Cd 1.80, Fe 108.00, Cr 0.35 and Zn 295.50 mg/kg), outdoor dust (Pb 15.90, Cd 19.00, Fe 103.3, Cr 0.10 and Zn 213.00 mg/kg) and control dust ( Pb 9.40, Cd -, Fe 62.00, Cr â and Zn 78.00 mg/kg). Although the result showed a relatively low contamination in general, it could be inferred that the increased concentration of heavy metals from the indoor electronic waste could be from the interaction of heavy metals in the e-waste components with the settled dust on them over time. Risk assessment predicted that Cd and Zn in the e-waste have the potential to pose serious health risks to workers, customers and local residents of Westminister area, especially children, and this underscores the urgent intervention by relevant government agencies.26:T75e,

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