From: Application of principal component analysis in the pollution assessment with heavy metals of vegetable food chain in the old mining areas
Soil samples under
Fe
Mn
Zn
Cu
Ni
Cd
Pb
Normal contents (NC)
-
900
100
20
1
Alert threshold values (ATV)
1500
300
75
3
50
Intervention threshold values (ITV)
2500
600
200
150
5