Crop

Pb

Cd

Ni

Hg

Fluted pumpkin (Telfaria occidetalis)

0.56

0.25

0.66

Nda

Scent leaf (Ocimum gratissimum)

0.88

0.34

0.49

Nd

Gnetum africana

Nd

0.17

0.35

Nd

Black pepper leaf (Piper guinenese)

1.38

0.37

1.27

Nd

Green leaf (Amaranthus viridis)

1.60

0.27

1.30

Nd

Waterleaf (Taliun triangulare)

0.94

0.12

0.59

Nd

Bitterleaf (Vernonia amygdalina)

0.35

0.13

Nd

Nd

Gangronema latifolium

1.27

0.31

0.99

0.02

Garden egg leaf (Solanum melongena)

0.80

0.35

0.67

0.03

Curry leaf (Murraya koenigii)

3.89

0.23

0.32

Nd

Okra (Abelmoschus esculentus)

Nd

0.11

0.08

Nd

Cucumber (Cucumis sativus)

Nd

Nd

0.80

Nd

White camwood (Pterocarpus mildbreadii)

Nd

Nd

1.00

Nd

a Nd = not detectable.
Table 1: Lead, cadmium nickel and mercury levels (mg·kg-1) in vegetables.