Table 1. Loads of pollutants (in tonnes) discharged to the Baltic Sea by the Oder river 
-14- 
Parameter 
Annual load 
Period from 19. July to 21. August 
1997/1996 
Rate** 
1996 
1996 
1997 
% 
BOD 
71231 
5009 
20495 
4.1 
29 
COD 
577151 
42881 
220513 
5.1 
38 
Chlorides 
1525001 
116160 
275330 
2.4 
18 
Dissolved solids 
8674668 
664200 
2139040 
3.2 
25 
Suspended matter 
326284 
20171 
51798 
2.6 
16 
Calcium 
1461109 
111966 
390065 
3.5 
27 
Magnesium 
203964 
15175 
59597 
3.9 
29 
Nitrate nitrogen 
44365 
3082 
6805 
2.2 
15 
Total nitrogen 
78507 
5810 
15462 
2.7 
20 
Phosphates 
6045 
420 
2556 
6.1 
42 
Total phosphorus 
6159 
464 
1578 
3,4 
26 
Zinc* 
299,6 
20,7 
102,6 
4,9 
34 
Cadmium* 
1,8 
0,083 
0,187 
2,3 
10 
Copper* 
54,6 
4,0 
27,4 
6,9 
50 
Lead* 
30,4 
1,33 
2,7 
2.1 
9 
Mercury* 
0,776 
0,018 
0,062 
3,4 
8 
* dissolved fraction 
** percentage of flood load in annual 1996 load 
Table 2. Loads of pollutants (in tonnes) discharged to the Baltic Sea by the Vistula river 
Parameter 
Annual load 
Period from 15. July to 15. August 
1997/1996 
Rate** 
1996 
1996 
1997 
% 
BOD 
140743 
7091 
22315 
3.1 
16 
COD 
795053 
41341 
248750 
6.0 
31 
Chlorides 
4639989 
351873 
503587 
1.4 
11 
Dissolved solids 
17305022 
1285588 
2783728 
2.2 
16 
Suspended matter 
402069 
14913 
169177 
11.3 
42 
Calcium 
2500653 
170796 
441520 
2.6 
18 
Magnesium 
376500 
26840 
62040 
2.3 
16 
Nitrate nitrogen 
57847 
3002 
9059 
3.0 
16 
Total nitrogen 
152406 
8333 
18820 
2.3 
12 
Phosphates 
11399 
629 
3405 
5.4 
30 
Total phosphorus 
5334 
280 
1402 
5.0 
26 
Zinc* 
170,5 
11,510 
21,1 
1,8 
12 
Cadmium* 
4,04 
0,142 
0,4 
2,8 
10 
Copper* 
52,07 
2,92 
10,3 
3,5 
20 
Lead* 
15,5 
0,569 
2,28 
4,0 
15 
Mercury* 
2,8 
0,047 
0,144 
3,1 
5 
* dissolved fraction 
** percentage of flood load in annual 1996 load