Table 5 Chemical and nutrient composition (average ± standard deviation of three replicates) of the sediments collected from Tekirghiol, Amara and Ursu lakes.
Compound (mg kg−1) | Tekirghiol Lake | Amara Lake | Ursu Lake |
|---|---|---|---|
Chemical composition | |||
Na+ (Total) | 17,367 ± 624 | 8967 ± 348 | 271,333 ± 9855 |
K+ (Total) | 6267 ± 220 | 4900 ± 196 | 720 ± 28 |
Ca2+ (Total) | 56,067 ± 1842 | 97,667 ± 3210 | 13,933 ± 557 |
Mg2+ (Total) | 15,017 ± 604 | 14,373 ± 535 | 2470 ± 99 |
Cl− (Water sol.) | 27,700 ± 889 | 11,200 ± 228 | 410,000 ± 9400 |
Fe (Total) | 17,910 ± 716 | 17,997 ± 519 | 6867 ± 274 |
Mn (Total) | 195 ± 12 | 575 ± 32 | 216 ± 12 |
Cu (Total) | 26.1 ± 1.56 | 24.6 ± 1.4 | 13.8 ± 0.8 |
Ba (Total) | 76 ± 4.6 | 87 ± 5 | 11 ± 1 |
Al (Total) | 18,290 ± 1070 | 16,947 ± 1010 | 9150 ± 349 |
Zn (Total) | 106.5 ± 6.4 | 76 ± 6 | 128.1 ± 7.7 |
Pb (Total) | 11.5 ± 0.7 | 7.5 ± 0.5 | 14.5 ± 0.9 |
Cr (Total) | 23.4 ± 1.4 | 19.7 ± 1.1 | 4.3 ± 0.4 |
Sr (Total) | 124 ± 8 | 49 ± 3 | 43 ± 2 |
Ni (Total) | 17.3 ± 1.1 | 18.7 ± 1.2 | 4.7 ± 0.3 |
Co (Total) | 5.1 ± 0.5 | 5.8 ± 0.5 | 1.4 ± 0.1 |
As (Total) | 4.97 ± 0.45 | 8.16 ± 0.66 | 3.31 ± 0.24 |
Cd (total) | 0.80 ± 0.1 | 0.81 ± 0.07 | 1.12 ± 0.10 |
Water soluble nutrient composition | |||
DTN | 172 ± 12 | 107 ± 7 | 247 ± 16 |
NO3− | 180 ± 9 | 52.5 ± 3.5 | < 2.0 |
NO2− | < 0.5 | < 0.5 | < 0.5 |
N–NH4 | 125 ± 8 | 75 ± 5 | 240 ± 14 |
SO42− | 250 ± 14 | 13,240 ± 850 | 280 ± 18 |
Sulfides | 20.6 ± 1.3 | 18.5 ± 1.2 | 20.2 ± 1.4 |
Total P | 1.90 ± 0.11 | 2.33 ± 0.17 | 2.85 ± 0.18 |
DTC | 1051 ± 65 | 1021 ± 62 | 1152 ± 76 |
DIC | 576 ± 38 | 616 ± 44 | 314 ± 20 |
DOC (= DC-DIC) | 475 ± 30 | 405 ± 26 | 838 ± 52 |
C/N ratio | 6.11 ± 0.44 | 9.54 ± 0.62 | 4.66 ± 0.33 |
