Heavy metal (µg/g)

Samples from the South Eastern region

Samples from the North Central region

F test

p value

[28]

STD

Pb

0.40 ± 0.05

0.31 ± 0.02

0.02

0.5

Cd

0.05 ± 0.01

0.0 ± 0.00

0.01

0.02

Cu

0.62 ± 0.08

0.96 ± 0.05

0.01

2.00