Final Report - ICPDR

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concentration ratio
10
1
mussel/sediment
mussel/suspended solids
0,1
PCB 28
PCB 153
PCB 138
Pentachlorobenzene
Lindane
pp'-DDT
benzo(a)pyrene
Figure 4.1.5.2 Concentration ratio of pollutants in mussel/sediment and in
mussel/suspended solids
The figure shows that mussels concentrated some of the pollutants. The
accumulation factor was around 10 for the components PCB 153, PCB 138,
pentachlorobenzene and lindane.
Figures 4.1.5.3 – 4.1.5.26 illustrate the organic micropollutant content of suspended
solids, sediment and mussel.
Organochlorine compounds
pp’-DDT was found in the sediment of the Tisza River and in the tributaries in low
concentration (mean in Tisza 0,0058 mg/kg, mean in the tributaries 0,0027 mg/kg),
compared to the 0,040 mg/kg limit value.
In the suspended solids the pp’-DDT concentrations were much higher than in the
sediment. Both in the tributaries and in the Tisza River the mean concentrations
exceeded the limit value (0,040 mg/kg). Although DDT application was banned for
several decades in the Tisza River Basin, a high concentration of the suspended
solids can be explained by the soil erosion of cultivated lands.
In the mussels the pp’-DDT mean concentration was 8,5 µg/kg. It is somewhat higher
than the mean pp’-DDT concentration in Tisza sediment (5,8 µg/kg), but much lower
than the mean pp’-DDT concentration in the Tisza suspended solids (50 µg/kg).
Lindane concentrations in the Tisa River and in the tributaries were very low both in
the sediment and in the suspended solids. The mean concentrations were around 10
% of the Rhine target value (10 µg/kg). Lindane was accumulated in mussels, the
mean lindane concentration of mussels was 10.2 µg/kg.
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