Elements

Gade

Tobéne

Darou Khoudoss

Maximum allowable level in soil (mg/kg) WHO 1996

As (mg/kg)

0.28

0.38

0.21

<20

Cd (mg/kg)

0.88

0.88

0.83

<0.8

Cr (mg/kg)

1.10

1.44

1.27

<100

Cu (mg/ml)

2.29

1.95

2.12

<36

Hg (mg/kg)

0.80

0.86

0.73

<1.9

Pb (mg/kg)

0.24

0.28

0.27

<100

Zn (mg/kg)

4.15

3.73

3.90

<50

Soufre (mg/kg)

-

Phosphate (mg/kg)

2211.00

542.00

375.00

500 - 800 mg/kg