Technical Reports Parts C,D - ICPDR

Technical Reports – Part C: Water Quality 43
The content of mineral nitrogen species in the major Danube tributaries ranges between 0,10 and 6,0
mg/L for Tizsa River, 0,92 - 4,2 mg/L for Uzh River and 0,37 - 5,9 mg/L for Prut River. Long term
trend of mineral nitrogen is reversibly related with water level. The prevailing concentrations are
between 2,5 and 4,3mg/L with domination of nitrates and ammonium. The less abundant are nitrites.
Figure 4.11.
N (miner. forms) content in Uzh water, Uzhgorod town
4.5
4
3.5
3
2.5
2
(ppm
1.5
1
0.5
0
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1995
1994
1995
1994
4.11.2. Phosphorus.
The monitoring data are presented only for total phosphorus (data of the hydrometeorological
station) for a period 1994 -1996. Average concentration of total phosphorus in the Danube water
varies between 0,14 - 0,47mg/L, with a range 0,06 - 1 mg/L. While in 1994 the changes of total
phosphorus follow the changes of river discharges, later became more stable (Fig. 4.12.).
Figure 4.12.
Phosphorus content in Danube water, Ismail town
1
0.8
0.6
0.4
(mg/
0.2
1996
1995
1994
1994
0
1995
Jan Feb Mar Apr May Jun 1996
Jul Aug Sep Oct Nov Dec