M. Protasowicki et al., The comparison of sediment contamination in the area of estuary and the lower course of the Odra before and after the flood of summer 1997, ACT HYDR HY, 27(5), 1999, pp. 338-342
The concentration of heavy metals (Hg, Cd, Pb, Cu, Zn, Cr, Ni, Mn) and chlo
roorganic substances (gamma-HCH, Sigma DDT, PCB) in surface sediments of th
e Western and the Eastern Odra River was analyzed after the 1997 flood and
compared with data from 1995.
The research has shown that, like in 1995, the Western Odra sediments were
more contaminated with heavy metals and PCBs than the Eastern Odra ones.
In comparison with the state of 1995, after the flood in both arms of the O
dra, the amount of Cr, Mn, and PCBs has increased while the amount of Pb co
ncentration decreased. The levels of Cd, Zn, and Ni have remained unchanged
.
The changes of the other pollutants were not so clear. The concentration of
Hg and Cu increased in the Western Odra, while it decreased in the Eastern
Odra; changes of gamma-HCH and Sigma DDT content were inverted.