Table 4.

Concentrations of zinc (Zn), iron (Fe), copper (Cu), and lead (Pb) in river water and catfish from the River Niger.

Metal	Dry Season		Wet Season		WHO (1984)
	River Niger	Catfish	River Niger	Catfish
Zn	0.261 ± 0.066	3.5 ± 0.432	0.36 ± 0.089	4.423 ± 0.693	5
Fe	1.41 ± 1.182	4.73 ± 0.221	1.59 ± 1.306	5.731± 1.205	0.3
Cu	0.008 ± 0.005	0.60 ± 0.113	0.05 ± 0.077	1.14 6 ± 0.343	1
Pb	ND	0.04 ± 0.007	ND	0.416 ± 0.472	0.05

Source: Nsofor and Ikpeze (2014) [40].