Table 5.

Concentration of heavy metals in leaf samples of medicinal plants

		Mean heavy metal concentration in leaf samples (ppm)
S/N	Plant species	Mn	Cr	Pb	Fe	Cd	Ni	Co	Zn	Hg
1	Acacia nilotica	3.16 ± 0.0371	8.73 ± 0.0260*	0.21 ± 0.0208	16.01 ± 0.0642	BDL	0.59 ± 0.0202	0.19 ± 0.0284	3.09 ± 0.0305	BDL
2	Bacopa monnieri	1.67 ± 0.0425	13.19 ± 0.0480*	0.54 ± 0.0417	14.19 ± 0.0633	0.03 ± 0.0088	0.23 ± 0.0317	0.15 ± 0.0115	4.80 ± 0.0907	BDL
3	Commiphora wightii	2.84 ± 0.0688	8.53 ± 0.0317*	0.21 ± 0.0145	13.30 ± 0.0264	BDL	0.26 ± 0.0348	0.20 ± 0.0200	2.10 ± 0.0173	BDL
4	Ficus religiosa	2.60 ± 0.0392	9.54 ± 0.0202*	0.32 ± 0.0240	12.42 ± 0.0272	0.03 ± 0.0057	0.30 ± 0.0296	0.14 ± 0.0120	3.25 ± 0.0240	BDL
5	Glycyrrhiza glabra	2.23 ± 0.0305	9.17 ± 0.0173*	0.32 ± 0.0233	11.33 ± 0.0296	0.03 ± 0.01660	0.38 ± 0.0233	0.40 ± 0.0251	3.89 ± 0.0348	BDL
6	Hemidesmus indicus	2.26 ± 0.0260	11.68 ± 0.0480*	0.25 ± 0.0088	13.64 ± 0.0115	0.16 ± 0.0260	0.32 ± 0.0173	0.16 ± 0.0251	4.18 ± 0.0212	BDL
7	Salvadora oleoides	0.89 ± 0.0458	10.48 ± 0.0440*	0.52 ± 0.0202	11.03 ± 0.0497	BDL	0.48 ± 0.0193	0.15 ± 0.0208	4.40 ± 0.0240	BDL
8	Terminalia bellirica	2.60 ± 0.0348	11.02 ± 0.0808*	0.25 ± 0.0120	13.21 ± 0.0202	0.21 ± 0.0176	0.26 ± 0.0257	0.18 ± 0.0145	3.28 ± 0.0145	BDL
9	Terminalia chebula	2.04 ± 0.0264	11.23 ± 0.0887*	0.48 ± 0.0290	14.59 ± 0.0352	0.02 ± 0.0120	0.57 ± 0.0264	0.17 ± 0.0264	2.58 ± 0.0237	BDL
10	Withania somnifera	0.34 ± 0.0152	12.34 ± 0.0458*	0.81 ± 0.0360	17.44 ± 0.0202	0.04 ± 0.0274	0.19 ± 0.0371	0.14 ± 0.0135	4.10 ± 0.0360	BDL

*Beyond permissible limit defined by WHO.