## 3 Results and Discussion
### Physico-Chemical Parameters
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**No.** & **Sampling Sites** & \begin{tabular}{c} **N-NH\({}_{4}\)** \\ **mg N/L** \\ \end{tabular} & \begin{tabular}{c} **N-NO\({}_{3}\)** \\ **mg N/L** \\ \end{tabular} & \begin{tabular}{c} **N-NO\({}_{3}\)** \\ **mg N/L** \\ \end{tabular} & \begin{tabular}{c} **N Total** \\ **mg N/L** \\ \end{tabular} & \begin{tabular}{c} **P-PO\({}_{4}\)** \\ **mg P/L** \\ \end{tabular} & \
\begin{tabular}{c} **P Total** \\ **ug/L** \\ \end{tabular} &
\begin{tabular}{c} **Chloroph. a** \\ **pH Unit** \\ \end{tabular} \\ \hline
1 & Ostrov Jerry & 0.09 & 0.013 & 1.130 & 2.64 & 0.03 & 0.10 & 0.9 & 8.83 \\ \hline
2 & Ostrov, Danube old branch & 0.05 & 0.012 & 1.333 & 1.94 & 0.03 & 0.94 & 2.9 & 7.81 \\ \hline
3 & Fetesti & 0.2 & 0.016 & 0.44 & 1.57 & 0.03 & 0.10 & 0.9 & 7.77 \\ \hline
4 & Cernavoda bridge & 0.07 & 0.011 & 1.370 & 2.70 & 0.034 & 0.112 & 0.9 & 8.87 \\ \hline
5 & Cernavoda Seimeni & 0.18 & 0.015 & 1.148 & 1.50 & 0.038 & 0.065 & 5.7 & 8.78 \\ \hline
6 & Braila harbor upstream & 0.10 & 0.019 & 1.870 & 2.94 & 0.027 & 0.06 & 6.7 & 8.73 \\ \hline
7 & Braila harbor downstream & 0.07 & 0.016 & 1.00 & 2.40 & 0.038 & 0.079 & 5.7 & 8.81 \\ \hline
8 & Siret R. upstream & 0.25 & 0.048 & 1.481 & 3.17 & 0.033 & 0.172 & 4.4 & 8.66 \\ \hline
9 & Siret R. downstream & 0.18 & 0.047 & 1.611 & 1.58 & 0.022 & 0.147 & 7.3 & 8.6 \\ \hline
10 & Galati downstream & 0.09 & 0.017 & 0.533 & 1.59 & 0.026 & 0.589 & 5.6 & 8.82 \\ \hline
11 & Galati shipyard downstream & 0.27 & 0.016 & 1.278 & 2.19 & 0.033 & 0.266 & 4.4 & 8.71 \\ \hline
12 & Prut R. upstream Giurjulesti & 0.23 & 0.023 & 0.278 & 2.15 & 0.012 & 0.011 & 2.7 & 8.66 \\ \hline
13 & Prut R. downstream & 0.08 & 0.019 & 1.019 & 2.43 & 0.033 & 0.160 & 0.3 & 8.78 \\ \hline
14 & Reni downstream & 0.08 & 0.019 & 1.036 & 2.56 & 0.031 & 0.272 & 2.8 & 8.68 \\ \hline
15 & Isacea downstream & 0.11 & 0.021 & 1.037 & 2.66 & 0.033 & 0.205 & 5.7 & 8.59 \\ \hline
16 & Ceatal Chilia & 0.09 & 0.027 & 1.111 & 1.96 & 0.029 & 0.128 & 2.4 & 8.63 \\ \hline
17 & Izmail downstream & 0.08 & 0.035 & 0.98 & 1.56 & 0.021 & 0.188 & 3.2 & 8.44 \\ \hline
18 & Ceatal Sf.Cheorghe & 0.08 & 0.044 & 1.052 & 1.42 & 0.032 & 0.038 & 0.4 & 8.52 \\ \hline
19 & Chilia veche upstream & 0.07 & 0.050 & 1.031 & 1.23 & 0.033 & 0.121 & 3.7 & 8.48 \\ \hline
20 & Chilia veche downstream & 0.09 & 0.050 & 1.058 & 1.53 & 0.034 & 0.188 & 3.7 & 8.48 \\ \hline
21 & Sf.Cheorghe upstream & 0.07 & 0.047 & 1.020 & 1.26 & 0.038 & 0.184 & 3.1 & 8.63 \\ \hline
22 & Musura bay mouth & 0.04 & 0.039 & 1.81 & 1.40 & 0.034 & 0.044 & 2.0 & 8.9 \\ \hline
23 & Sulina mouth & 0.05 & 0.048 & 0.046 & 1.67 & 0.035 & 0.164 & 4.4 & 8.42 \\ \hline
24 & Sf.Cheorghe mouth & 0.05 & 0.042 & 0.048 & 1.64 & 0.039 & 0.189 & 3.0 & 8.56 \\ \hline
25 & Sacalin & 0.07 & 0.041 & 0.029 & 1.80 & 0.039 & 0.183 & 4.1 & 8.48 \\ \hline
26 & Gura Portiti & 0.23 & 0.035 & 1.870 & 2.19 & 0.036 & 0.044 & 1.4 & 8.99 \\ \hline
27 & Corbu & 0.21 & 0.029 & 1.871 & 2.11 & 0.036 & 0.022 & 2.8 & 9.01 \\ \hline
28 & Manasia & 0.23 & 0.029 & 1.950 & 1.16 & 0.035 & 0.039 & 4.4 & 9.24 \\ \hline
29 & Constanta & 0.24 & 0.024 & 1.950 & 1.16 & 0.035 & 0.039 & 4.4 & 9.24 \\ \hline
30 & Costinesti & 0.24 & 0.024 & 1.950 & 1.950 & 0.035 & 0.039 & 4.6 & 8.98 \\ \hline
31 & Mangalia & 0.45 & 0.044 & 0.162 & 1.21 & 0.035 & 0.038 & 17.4 & 9.23 \\ \hline
32 & Vama veche & 0.02 & 0.022 & 1.92 & 1.84 & 0.031 & 0.035 & 2.41 & 9.09 \\ \hline \multicolumn{8}{c}{Ecological status} \\ \hline Highest ecological status & 0.0 & 0.01 & 1.1 & 1.1 & 0.13 & 0.13 & 0.13 & 0.13 \\ \hline Good ecological status & 0.0 & 0.03 & 3.7 & 0.2 & 0.4 & 50 & \\ \hline Moderate ecological status & 1.2 & 0.06 & 5.6 & 12. & 0.4 & 0.75 & 100 & 6.5-8.5 \\ \hline Poor ecological status & 3.2 & 0.3 & 11.2 & 16. & 0.9 & 12 & 250 \\ \hline Bad ecological status & 0.2 & 1.8 & 1.1 & 1.1 & 0.13 & 0.13 & 0.13 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Physico-chemical parameters of water in the target region and site classification in ecological classes.