Table 3 Water and sediment characteristics (mean ± SD) measured in Olifantsnek and Bospoort Dams during the field exposure
Code | Olifantsnek Dam | Bospoort Dam | |
|---|---|---|---|
Water parameters | |||
pH | pH | 8.1 ± 0.2 | 7.4 ± 0.4 |
Electrical conductivity (µS/cm) | EC | 200 ± 15 | 1356 ± 277 |
Temperature (°C) | Temp | 23.8 ± 0.7 | 25.7 ± 3.7 |
Dissolved oxygen (mg/L) | DO | 8.0 ± 3.6 | 5.5 ± 3.7 |
Turbidity (FAU) | Turb | 38 ± 5 | 9 ± 2 |
Ammonium (mg/L) | NH4+ | 0.02 ± 0.01 | 0.13 ± 0.01 |
Nitrate (mg/L) | NO3− | 0.32 ± 0.04 | 0.14 ± 0.05 |
Nitrite (mg/L) | NO2− | 0.007 ± 0.004 | 0.004 ± 0.001 |
Ortho-phosphate (mg/L) | PO43− | 0.04 ± 0.01 | 0.20 ± 0.01 |
Chloride (mg/L) | Cl− | 12 ± 1.0 | 240 ± 3.8 |
Sulfate (mg/L) | SO42− | 86 ± 4.7 | 233 ± 3.8 |
Suspended solids (mg/100 mL) | SS | 3.8 ± 2.8 | 1.9 ± 1.1 |
Sediment parameters | |||
Organic content (%) | OC | 3.4 ± 1.4 | 2.3 ± 0.5 |
Gravel (%) | G | 0.3 ± 0.2 | 5.9 ± 3.6 |
Very coarse sand (%) | VCS | 0.5 ± 0.2 | 6.4 ± 3.9 |
Coarse sand (%) | CS | 2.6 ± 0.8 | 26.1 ± 9.9 |
Medium sand (%) | MS | 9.6 ± 6.7 | 34.5 ± 5.6 |
Fine sand (%) | FS | 73.1 ± 1.6 | 22.7 ± 3.9 |
Mud (%) | M | 13.9 ± 9.1 | 4.3 ± 1.0 |