Heavy metals

Extraction

methods

Experimental

Sets

Concentrations of cadmium and lead (mg∙kg⁻¹ matrix)

Level of significance

t-value P

Lateritic soil

River sand

Cadmium

Total

Control

2.76 ± 0.2

3.95 ± 0.29

3.265

<0.01

Treated

135.30 ± 7.8

188.00 ± 11.6

3.859

<0.01

Exchangeable

Control

n.d.

0.11 ± 0.01

-

-

Treated

79.61 ± 5.57

88.22 ± 6.88

0.981

n.s.

Lead

Total

Control

46.28 ± 3.33

52.00 ± 3.21

1.207

n.s

Treated

131.2 ± 7.55

177.84 ± 0.24

3.666

<0.01

Exchangeable

Control

n.d.

0.9 ± 0.07

-

-

Treated

12.34 ± 0.75

40.26 ± 2.57

10.42

<0.001