Heavy metal	Mean (Grain) for three sites (mg/kg)	Mean (Leave) for three sites (mg/kg)	WHO standards (mg/kg)
Heavy metal	Mean (Grain) for three sites (mg/kg)	Mean (Leave) for three sites (mg/kg)	WHO standards (mg/kg)
Zn	0.122	0.115	3
Cd	0.033	0.043	0.03
Cu	0.111	0.117	2
Co	0.04	0.041	0.01
Pb	0.338	0.323	0.1