Sequential Extractions and Toxicity Potential of Trace Metals Absorbed into Airborne Particles in an Urban Atmosphere of Southwestern Nigeria

Table 3

Mean values of total metal content (µgg⁻¹) ± standard deviation of dust sampled.

Sites	AKEX	AKOA	AKOB	AKAL	AKOR	AKBG
Pb	70.49 ± 16.27	77.11 ± 3.67	65.54 ± 3.13	86.20 ± 5.34	51.82 ± 2.88	11.82 ± 0.88
Cu	3.54 ± 1.05	1.87 ± 3.68	0.62 ± 1.05	0.87 ± 1.05	1.72 ± 1.05	0.54 ± 1.05
Zn	8.23 ± 0.66	11.12 ± 3.17	2.79 ± 3.17	5.13 ± 3.17	9.89 ± 3.17	1.38 ± 3.17
Cr	16.24 ± 1.54	18.57 ± 2.75	10.31 ± 1.54	9.92 ± 1.54	10.01 ± 1.54	9.02 ± 1.54
Ni	2.23 ± 9.12	4.58 ± 1.04	2.63 ± 9.12	5.55 ± 9.12	0.88 ± 9.12	0.87 ± 9.12
Mn	5.81 ± 0.10	1.22 ± 1.07	0.98 ± 0.06	1.48 ± 0.02	1.91 ± 0.05	0.60 ± 0.03
Cd	10.63 ± 1.03	6.06 ± 1.88	6.44 ± 2.01	8.21 ± 0.69	9.53 ± 1.12	3.05 ± 0.09