Environmental Engineering Reference
In-Depth Information
Compared to urban soils from Bucharest and Iassy, the Baia Mare soil solution
contains about 7.6 times more Pb and 5.3 times more Zn.
Besides, there is a similar situation both for the other potential mobile fraction
(exchangeable fraction and organic matter bound fraction), and for those harder
mobile (fraction bound by oxides and crystal lattice of primary and secondary soil
minerals). If predominant acid reactions of these soils are taken into account, the
above conclusions explain the heavy metals abundance in mobile and potential
mobile fractions of the Baia Mare soil.
Heavy Metals Contamination/Pollution Level
The contamination/pollution index, counted using a method proposed by
[11]
,
show a large palette of values (Table
4
), the majority being spread below, and only
three values over the unit that define the contamination domain.
Those latter values were recorded only for Cd, Pb and Zn in the urban soils
lengthways the main streets of Baia Mare city. For other chemical elements, the
index values reflect moderate and sever contamination levels. In this series values
for Cd, Co, Cr and Ni are included. Very severe contamination levels were recorded
for Cd in Baia Mare soils and for Pb and Zn in Bucharest and Iassy soils.
Table 4
The values of heavy metal contamination/pollution indexex of urban soils situated
lengthways the main streets in Bucharest (1), Iassy (2), and Baia Mare (3)
Values of
contamination/
pollution index
Chemical
element
Location
Signification
Cd
(1)
0.43
Moderate contamination
(2)
0.32
Moderate contamination
(3)
0.94
Very severe contamination
Co
(1)
0.25
Slight contamination
(2)
0.28
Moderate contamination
(3)
0.49
Moderate contamination
Cr
(1)
0.43
Moderate contamination
(2)
0.39
Moderate contamination
(3)
0.50
Moderate contamination
Cu
(1)
0.54
Severe contamination
(2)
0.61
Severe contamination
(3)
1.04
Slight pollution
Ni
(1)
0.37
Moderate contamination
(2)
0.49
Moderate contamination
(3)
0.50
Moderate contamination
Pb
(1)
0.83
Very severe contamination
(2)
0.95
Very severe contamination
(3)
9.50
Very severe pollution
Zn
(1)
0.83
Very severe contamination
(2)
0.74
Very severe contamination
