Environmental Engineering Reference
In-Depth Information
Consequently, we could affirm that urban soils situated lengthways the main streets
from Baia Mare city are polluted with Pb, Zn, Cu and Cd, while the same situated
urban soils from Bucharest and Iassy are contaminated very severe with Pb and Zn,
severe contaminated with Cu and moderate contaminated with Cd.
Heavy Metals Correlations
Direct proportionality relationships; linear type, represented through a correlation
coefficient (r), or parabolic type, represented by a correlation ratio (h), were estab-
lished between some of the investigated heavy metals. The values, statistically
assured by a 5% confident level, are presented in Table 5 .
Clearly differentiation of correlations between Cd with Co and Mn, between Cr
with Mn, Ni, Pb and Zn, between Cu and Mn with Zn, between Ni with Mn and
between Pb with Cu and Zn, could be observed.
The strongest correlation between these chemical elements were recorded in
Baia Mare soil, where concentrated anthropogenic influences, caused by nonferrous
ore processing industry, generated a close dependence between component elements
of complex sulphide ores.
The smaller and diffused heavy metal concentrations in the other two cities soils
also showed a higher spreading degree. For this reason, the recorded values or their
correlation coefficients have been smaller.
Table 5 Values a of correlation coeffi cients (r) and ratio (h) between heavy metals from urban
soils situated lengthways the main streets in Bucharest (1), Iassy (2), and Baia Mare (3) cities
Cd
Co
Cr
Cu
Mn
Ni
Pb
Zn
Cd
Co
(1)r = 0.394
(2)r = 0.415
(3)h = 0.523
Cr
Cu
(1) h = 0.412
(2)h = 0.470
(3)h = 0.520
Mn
(1)r = 0.204
(2)r = 0.192
(3)r = 0.232
(1) h = 0.412
(2)h = 0.470
(3)h = 0.520
(3)r =
0.420
Ni
(1) h = 0.412
(2)h = 0.470
(3)h = 0.520
Pb
(3) h = 0.583
Zn
(1)r = 0.660
(2)r = 0.520
(3)h = 0.710
a Filled cells represent statistical assured values for confidential level 5%. The blank cells means
not statistical assured values.
(3) h = 0.620
(1)r = 0.420
(2)r = 0.567
(3)h = 0.624
(1)r = 0.374
(2)r = 0.429
(3)h = 0.703
 
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