Summary of Cr(VI) removal experiments with 5 g of HZ sediments and 25 mL solutions of 0.1 mg/L and 0.5 mg/L Cr(VI) including Cr(VI) removal % and equilibrium pH after 2-day reactions as well as silt and clay % and loss on ignition (LOI) % in sediments
| Sample ID . | 0.1 mg/L Cr(VI) . | 0.5 mg/L Cr(VI) . | Silt + Clay% . | LOI% . | ||
|---|---|---|---|---|---|---|
| pH . | Removal % . | pH . | Removal % . | |||
| PR-1 | 6.80 | 100 | 6.73 | 100 | 30.5 | 10.1 |
| PR-2 | 6.46 | 100 | 6.45 | 98 | 25.8 | 10.5 |
| PR-3 | 6.44 | 100 | 6.52 | 96 | 13.2 | 6.0 |
| PR-4 | 6.27 | 100 | 6.17 | 100 | 31.6 | 11.7 |
| PR-5 | 6.82 | 91 | 6.85 | 68 | 5.0 | 4.8 |
| AVG | 6.56 | 98 | 6.54 | 92 | 21.2 | 8.6 |
| HR-2 | 6.65 | 64 | 6.64 | 40 | 5.4 | 2.7 |
| HR-4 | 6.76 | 73 | 6.8 | 66 | 4.8 | 7.3 |
| HR-5 | 7.52 | 45 | 7.42 | 28 | 4.4 | 2.7 |
| HR-8 | 6.54 | 91 | 6.57 | 98 | 9.0 | 8.8 |
| AVG | 6.87 | 68 | 6.86 | 58 | 5.9 | 5.4 |
| NB-1 | 6.40 | 50 | 6.55 | 11 | 0.0 | 3.9 |
| NB-2 | 6.99 | 18 | 7.02 | 4 | 0.0 | 0.7 |
| NB-3 | 6.87 | 45 | 6.92 | 15 | 0.0 | 2.3 |
| NB-4 | 6.93 | 27 | 6.87 | 13 | 0.0 | 1.6 |
| NB-5 | 6.98 | 64 | 6.85 | 53 | 0.0 | 1.1 |
| NB-6 | 6.71 | 45 | 6.76 | 38 | 0.8 | 3.2 |
| AVG | 6.81 | 42 | 6.83 | 22 | 0.1 | 2.1 |
| NBG1-1 | 7.23 | 64 | 7.16 | 49 | 0.0 | 0.5 |
| NBG1-2 | 7.22 | 9 | 7.18 | 9 | 0.0 | 0.5 |
| NBG1-3 | 6.87 | 18 | 7.05 | 15 | 0.0 | 0.5 |
| AVG | 7.11 | 30 | 7.13 | 25 | 0.0 | 0.5 |
| NBG2-1 | 7.02 | 45 | 6.88 | 43 | 0.0 | 2.7 |
| NBG2-2 | 6.88 | 27 | 6.74 | 36 | 0.0 | 2.4 |
| NBG3-2 | 7.04 | 9 | 6.90 | 9 | 0.3 | 1.6 |
| NBG3-3 | 7.60 | 55 | 7.61 | 9 | 0.3 | 1.3 |
| AVG | 7.14 | 34 | 7.03 | 25 | 0.2 | 2.0 |
| Sample ID . | 0.1 mg/L Cr(VI) . | 0.5 mg/L Cr(VI) . | Silt + Clay% . | LOI% . | ||
|---|---|---|---|---|---|---|
| pH . | Removal % . | pH . | Removal % . | |||
| PR-1 | 6.80 | 100 | 6.73 | 100 | 30.5 | 10.1 |
| PR-2 | 6.46 | 100 | 6.45 | 98 | 25.8 | 10.5 |
| PR-3 | 6.44 | 100 | 6.52 | 96 | 13.2 | 6.0 |
| PR-4 | 6.27 | 100 | 6.17 | 100 | 31.6 | 11.7 |
| PR-5 | 6.82 | 91 | 6.85 | 68 | 5.0 | 4.8 |
| AVG | 6.56 | 98 | 6.54 | 92 | 21.2 | 8.6 |
| HR-2 | 6.65 | 64 | 6.64 | 40 | 5.4 | 2.7 |
| HR-4 | 6.76 | 73 | 6.8 | 66 | 4.8 | 7.3 |
| HR-5 | 7.52 | 45 | 7.42 | 28 | 4.4 | 2.7 |
| HR-8 | 6.54 | 91 | 6.57 | 98 | 9.0 | 8.8 |
| AVG | 6.87 | 68 | 6.86 | 58 | 5.9 | 5.4 |
| NB-1 | 6.40 | 50 | 6.55 | 11 | 0.0 | 3.9 |
| NB-2 | 6.99 | 18 | 7.02 | 4 | 0.0 | 0.7 |
| NB-3 | 6.87 | 45 | 6.92 | 15 | 0.0 | 2.3 |
| NB-4 | 6.93 | 27 | 6.87 | 13 | 0.0 | 1.6 |
| NB-5 | 6.98 | 64 | 6.85 | 53 | 0.0 | 1.1 |
| NB-6 | 6.71 | 45 | 6.76 | 38 | 0.8 | 3.2 |
| AVG | 6.81 | 42 | 6.83 | 22 | 0.1 | 2.1 |
| NBG1-1 | 7.23 | 64 | 7.16 | 49 | 0.0 | 0.5 |
| NBG1-2 | 7.22 | 9 | 7.18 | 9 | 0.0 | 0.5 |
| NBG1-3 | 6.87 | 18 | 7.05 | 15 | 0.0 | 0.5 |
| AVG | 7.11 | 30 | 7.13 | 25 | 0.0 | 0.5 |
| NBG2-1 | 7.02 | 45 | 6.88 | 43 | 0.0 | 2.7 |
| NBG2-2 | 6.88 | 27 | 6.74 | 36 | 0.0 | 2.4 |
| NBG3-2 | 7.04 | 9 | 6.90 | 9 | 0.3 | 1.6 |
| NBG3-3 | 7.60 | 55 | 7.61 | 9 | 0.3 | 1.3 |
| AVG | 7.14 | 34 | 7.03 | 25 | 0.2 | 2.0 |