Technical Reports Parts C,D - ICPDR

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44 Danube Pollution Reduction Programme – National Review, Ukraine The phosphorus content in the major Danube tributaries is evidently lower than in Danube. Table 4.11. The variations in phosphorus content for the Danube tributaries Total phosphorus, mg/L Average annual Maximum Minimum Tisza 0,08 - 0,13 0,51 0,01 Uzh 0,08 0,09 0,06 Prut 0,14-0,17 1,00 0,03 4.11.3. COD and BOD The most comprehensive monitoring data exist for BOD 5 that creates a good base for long-term trends assessment of organic pollution. Long term trend of BOD 5 changes is presented in the Fig. 10. that reveals the evident decrease of this variable. It can be explained by reduction of discharges of easily oxidized organic matter with industrial discharges due to decline of industrial output. Seasonal BOD 5 variations in 1997 are presented on the Fig. 4.13. that shows increase of readily available organic matter during high water periods. Figure 4.13. 3 BOD5 variation (1994-1997) 2.5 2 1.5 Reni Vilkovo Con 1 1993 1994 1995 1996 1997 Year BOD5 is rather stable in the Danube tributaries: 2-5,3 mg/L for Tisza River (primarily 4 mg/L), 2 - 5,7 mg/L with average 2,64 mg/L for Uzh, and 2 - 5,3 mg/L (average 2,65 - 3,75mg/L) for Prut. 4.11.4.Heavy Metals Hydrometeorological monitoring network in Ukraine has rather complete and long-term observations only for copper, chromium, and zinc. At the same time ecological inspections monitor copper, zinc, manganese, lead, nickel, chromium and iron. Long term trends in heavy metals contents is relatively stable for copper and chromium and slightly less stable for manganese and zinc. During the last two years the content of zinc and manganese have increased significantly.
<strong>Technical</strong> <strong>Reports</strong> – Part C: Water Quality 45 Figure 4.14. Seasonal variations of the heavy metals contents are very typical with elevated concentrations during spring-summer that might be explained by corresponding variations of suspended solids content and other natural processes in water bodies. According to the water quality criteria maximum allowable concentrations of copper and chromium are 1 mkg per L, and 10 mkg per L for zinc, lead, and manganese. Figure 4.15. Zn 2+ variation (1994-1997) 35 30 25 20 15 Con 1993 1994 1995 1996 1997 Year Reni Vilkovo Table 4.12. Annual average concentrations of heavy metals in the water of the river Danube, ppm Year Fe Cu Zn Mn Pb Ni Cr 1994 0,2442 14,417 26,653 14 10,236 1,4958 6,4347 1995 0,2493 14,292 24,139 14,611 10,722 1,4806 6,2472 1996 0,2255 12,879 24,864 13,212 11,227 1,5 6,7758 1997 0,23889 10,4306 30,0556 22,5556 10,5 1,575 6,29444
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DANUBE POLLUTION REDUCTION PROGRAMM
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Preface The National Reviews were d
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Part C Water Quality
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4.4. River Channel Characteristics.
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