Sample

Standard

Cd

Pb

Ni

Soil, ug·g-1

Indian Standard Awashthi

3-6

250-500

75-150

 

WHO/FAO, 2007

-

-

-

 

European Union, 2002

3-0

300

75

Soil, mg·kg-1

Canadian human quality health soil quality guideline

14

140

 

Plant, ug·g-1

Indian Standard Awashthi

1.5

2.5

1.5

 

WHO/FAO, 2007

0.2

5.0

-

 

Commission regulation, EU, 2006

0.2

0.30

-

Leaf vegetables

European Union maximum levels in foods (mg·kg-1 wet weight)

0.20 a

0.3b

 

Vegetables, excluding leaf vegetables

 

0.050 a

 

 

Stem vegetables, root vegetables, and potatoes

 

0.10 a

 

 

aaccording to Commission Regulation (EC) 1881/2006 latest amended by Regulation (EC) No 629/2008.
b FAO/WHO (2001), Joint Codex Alimentarius Commission.
Table 2: Guideline for safe limits of heavy metals.