Kupa river

Sava river and selected streams and lakes in the Zagreb city area, undertaken in 1992, showed that all samples contained PCBs at levels of 3-25 ng 1, comparable to those measured in the Kupa river. The highest PCB concentrations were determined in the Sava river water, while the levels of OC pesticides (water samples near or at the detection limit. The principal and, in most cases, efficient purification stage of ground waters in the Zagreb city area is natural filtration through the subsurface sediment layers. Due to their favourable composition soil and sediments serve as natural sorbents for the removal of major water contaminants. 

Table 203 Concentrations of OC pesticides and PCBs (A) in the Kupa river in the area of the town of Sisak (13 samples) and (B) in the Sisak drinking water (16 samples) in the period from March 1988 to April 1989 [8]...

The presence of CPs was confirmed in several surface waters in the continental part of Croatia in the Sava river along a river stretch extending up to 26 km upstream and 36 km downstream of the central Zagreb city area [17], in a number of small streams and lakes within the Zagreb city area [14], and in the Kupa river both upstream and in the area of the town of Sisak [8],... 

As in the Sava river, the highest CP concentrations in the Kupa river were measured for PCP. PCP was present in all river water samples collected nfonthly from March 1988 to April 1989 (Table 20.6) [8]. PCP concentrations in the Kupa river water was in general not dependent on the river flow rate. Unlike the Sava river, the Kupa river contained occasionally traces of 4-CP and the incidence of 2,4-DCP and 2,4,5-TCP was significantly higher. The concentrations of CPs in both the Sava and the Kupa river were far below the maximum limits of 0.1 pg 1 for 2-CP, 0.3 pg 1 for 2,4-DCP and 1 pg I fw 2,4,5-TCP,... 

Table 20.6 Concentrations of CPs in the water of the Sava river (sampling period 1984-1992) and small streams (sampling period 1988-1992) near and in the Zagreb city area and in the water of the Kupa river in the area of town of Sisak (sampling period 1988-1989)...

Compound Sava river N=52 Concentration range ng 1 Kupa river [8] N=21 1 Streams in Zagreb city area N=6... 

The presence of PCBs in the Kupa river is a well established fact. Since there are only a few or no alternatives for drinking water resources along that river, the installation and... 

Smit, Z., Drevenkar, V., and Kodrid-Smi(, M., Polychlorinated Biphenyls in the Kupa River, Croatia, Yugoslavia , in Organic Micropollutants in the Aquatic Environment, Proceedings of the Fifth European Symposium, Rome 1987, Commission of the European Communities, Angeletti, G. and Bj0iseth, A., (Eds.), Dordrecht, Kluwer Academic Publishers 1988, pp. 198-203. 

Picer, N., Picer, M and Perkov, S., Polychlorinated Biphenyls and Chlorinated Insecticides in Water and Fish of the Kupa River , in Proceedings of the Conference on Water Protection ZaStita voda 86 , Kragujevac 1986, pp. 291-296 (in Croatian). 

Several classes of flsh from the river Kupa ... 

Levels of organochlorine pesticide found in samples tested by the food inspection authorities during 1985-1989 are summarized in Table 11.7. Samples were collected from food markets throughout the country. Levels of organochlorine pesticide and PCB in foods from markets in Zagreb (1985-1992) and from households in Karlovac along the river Kupa (1987) are listed in Table 11.8. Analysis of a small number of specimens from Karlovac did not indicate any increase in PCB levels following contamination of the river. All samples listed in Table 11.8 contained p,p -DDE and the majority also PCB. The frequency with which p,p -DDE and PCB occurred in samples listed in Tables 11.5—11.7 was not stated. 

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