Heavy metals (mg·kg⁻¹ )

Site

Boulmiougou

Kossodo

As

0.86 ± 0.02^a

0.79 ± 0.01^a

Cd

0.87 ± 0.01^a

0.80 ± 0.02^a

Cr

0.86 ± 0.01^a

0.80 ± 0.02^a

Cu

0.86 ± 0.02^a

0.80 ± 0.02^a

Hg

0.87 ± 0.01^a

0.80 ± 0.01^a

Ni

0.87 ± 0.01^a

0.80 ± 0.01^a

Se

0.86 ± 0.01^a

0.80 ± 0.01^a

Zn

0.86 ± 0.03^a

0.80 ± 0.01^a