## 3 Results and Discussion
### Metals
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**No.** & **Sampling Sites** & **As** & **Cd** & **Cr** & **Cu** & **Mn** & **Ni** & **Pb** & **Zn** & **Hg** \\  & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L & \(\upmu\)g/L \\ \hline
1 & Ostrov ferry & 3.8 & 0.96 & 31.1 & 1.7 & 320 & 31.2 & 15.5 & 4 & 0.62 \\ \hline
2 & Ostrov, Danube old branch & 3.0 & 0.51 & 26.0 & 1.9 & 284 & 37.7 & 10.0 & 3 & 0.02 \\ \hline
3 & Fetesti & 1.0 & 0.89 & 34.5 & 12.7 & 270 & 40.1 & 12.4 & 16 & 0.03 \\ \hline
4 & Cernavoda bridge & 3.2 & 0.78 & 39.6 & 12.2 & 296 & 44.2 & 11.8 & 45 & 0.02 \\ \hline
5 & Cernavoda Seimeni & 1.0 & 1.32 & 49.5 & 23.0 & 244 & 28.4 & 9.4 & 9.6 & 0.04 \\ \hline
6 & Braila harbor upstream & 3.0 & 1.12 & 55.6 & 21.7 & 287 & 30.2 & 10.3 & 2 & 0.05 \\ \hline
7 & Braila harbor downstream & 3.5 & 1.00 & 48.6 & 28.6 & 10.8 & 31.2 & 8.2 & 45 & 0.04 \\ \hline
8 & Siret R. upstream & 3.2 & 1.20 & 43.1 & 27.4 & 295 & 29.3 & 9.3 & 57 & 0.03 \\ \hline
9 & Siret R. downstream & 3.0 & 1.07 & 61.2 & 17.4 & 284 & 30.4 & 10.1 & 5 & 0.03 \\ \hline
10 & Galati downstream & 3.4 & 0.89 & 55.6 & 10.7 & 286 & 27.2 & 9.2 & 4 & 0.03 \\ \hline
11 & Galati shipward downstream & 4.0 & 1.20 & 51.6 & 10.9 & 280 & 31.3 & 11.1 & 46 & 0.03 \\ \hline
12 & Prut R. upstream Giurgululisi & 4.4 & 0.82 & 46.9 & 27.4 & 256 & 38.0 & 8.3 & 76 & 0.02 \\ \hline
13 & Prut R. downstream & 4.7 & 1.32 & 54.3 & 17.4 & 272 & 27.8 & 9.4 & 45 & 0.05 \\ \hline
14 & Real downstream & 3.7 & 1.12 & 52.4 & 19.7 & 318 & 47.7 & 10.3 & 5 & 0.03 \\ \hline
15 & Isacco downstream & 3.9 & 1.00 & 48.2 & 17.4 & 325 & 32.6 & 8.7 & 44 & 0.05 \\ \hline
16 & Cetal Chilia & 3.0 & 0.65 & 51.6 & 19.7 & 288 & 27.2 & 11.3 & 47 & 0.05 \\ \hline
17 & Izmail downstream & 4.9 & 0.72 & 39.3 & 23.8 & 283 & 29.6 & 9.5 & 58 & 0.04 \\ \hline
18 & Coastal Si/Congbe & 3.0 & 0.75 & 41.9 & 22.4 & 196. & 19.7 & 10.1 & 42 & 0.05 \\ \hline
19 & Chilia vebe upstream & 3.0 & 0.68 & 31.2 & 24.6 & 284 & 24.9 & 9.9 & 47 & 0.06 \\ \hline
20 & Chilia vebe downstream & 3.2 & 0.66 & 40.1 & 24.2 & 294 & 26.9 & 9.7 & 44 & 0.05 \\ \hline
21 & Sf.Geberghe upstream & 1.8 & 0.80 & 29.0 & 1.1 & 226 & 29.6 & 7.1 & 58 & 0.04 \\ \hline
22 & Musuar hay mouth & 1.6 & 0.74 & 38.7 & 10.2 & 268 & 26.7 & 9.8 & 44 & 0.04 \\ \hline
23 & Stilina mouth & 1.5 & 0.66 & 27.0 & 18.2 & 266 & 30.0 & 8.1 & 49 & 0.06 \\ \hline
24 & Sf.Geberghe mouth & 14.7 & 0.80 & 32.1 & 11.6 & 274 & 27.2 & 6.0 & 49 & 0.06 \\ \hline
25 & Sacalin & 3.6 & 0.59 & 21.6 & 19.8 & 312 & 23.4 & 8.5 & 47 & 0.05 \\ \hline
26 & Gura Portieu & 3.5 & 0.87 & 31.1 & 25.9 & 325 & 123.3 & 8.7 & 74 & 0.05 \\ \hline
27 & Corbbu & 3.5 & 0.71 & 32.2 & 12.2 & 221 & 15.1 & 10.0 & 6 & 0.01 \\ \hline
28 & Mamaia & 1.0 & 0.69 & 32.6 & 17.3 & 270 & 231.1 & 6.0 & 49 & 0.01 \\ \hline
29 & Constanta & 3.5 & 0.70 & 45.0 & 21.4 & 381 & 16.6 & 5.2 & 71 & 0.01 \\ \hline
30 & Costinest & 3.3 & 0.83 & 28.4 & 16.3 & 344 & 19.9 & 6.3 & 33 & 0.01 \\ \hline
31 & Mangalia & 3.0 & 0.72 & 35.9 & 19.8 & 282 & 17.6 & 5.8 & 47 & 0.01 \\ \hline
32 & Vama vebe & 3.3 & 0.86 & 40.9 & 21.3 & 284 & 12.6 & 6.1 & 35 & 0.01 \\ \hline \hline \multicolumn{8}{c}{Ecological status according to Romanian Order no. 161/2006 [47]} \\ \hline \multicolumn{8}{c}{Highest ecological status} & 10 & 0.5 & 25 & 20 & 50 & 10 & 5 & 100 & 0.01 \\ \hline \multicolumn{8}{c}{Good ecological status} & 20 & 1 & 50 & 30 & 100 & 25 & 100 & 200 & 0.03 \\ \hline \multicolumn{8}{c}{Moderate ecological status} & 50 & 2 & 100 & 50 & 300 & 50 & 25 & 500 & 0.5 \\ \hline \multicolumn{8}{c}{Poor ecological status} & 200 & 5 & 250 & 100 & 1000 & 100 & 50 & 1000 & 1 \\ \hline \multicolumn{8}{c}{Bad ecological status} & 10 & 5 & 254 & 100 & 1000 & 200 & 54 & 1000 & 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Metal concentrations in surface water in the target region and site classification in ecological classes.