Fe (mg/L)

Ni (mg/L)

Zn (mg/L)

Food waste

0.93 ± 0.02

1.17 ± 0.04

0.24 ± 0.02

Kplala

1.16 ± 0.02

1.94 ± 0.03

0.54 ± 0.03

Waste of tuna

1.12 ± 0.03

1.57 ± 0.07

0.01 ± 0.01