Table 4.
Diameter of the particles of humic acids and zeta potential at different pH values.
| HA from Amd-C | HA from OMWF | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| pH | D (nm) | PDI/D | ZP (mV) | IC (mS cm-1) | pH | D (nm) | PDI/D | ZP (mV) | IC (mS cm-1) |
| 2 | 949 ± 45a | 0.39 ± 0.03d | -2.68 ± 0.82c | 15.10 ± 2.03a | 2 | 869 ± 24a | 0.41 ± 0.04c | -3.15 ± 0.23d | 14.30 ± 1.40a |
| 4 | 219 ± 34d | 0.53 ± 0.06c | -27.90 ± 1.48b | 1.81 ± 0.18b | 4 | 313 ± 18d | 0.47 ± 0.04c | -33.30 ± 1.52b | 2.24 ± 0.24b |
| 6 | 358 ± 40c | 0.76 ± 0.07b | -30.80 ± 1.60ab | 1.71 ± 0.20b | 6 | 478 ± 26b | 0.80 ± 0.06a | -27.10 ± 1.83c | 2.31 ± 0.21b |
| 8 | 424 ± 26c | 0.70 ± 0.07b | -33.70 ± 1.23a | 1.67 ± 0.33b | 8 | 381 ± 25c | 0.64 ± 0.06b | -30.66 ± 1.55bc | 1.68 ± 0.23c |
| 10 | 692 ± 40b | 1.00 ± 0.08a | -34.90 ± 1.30a | 2.02 ± 0.13b | 10 | 419 ± 37bc | 0.71 ± 0.03ab | -37.00 ± 2.10a | 1.84 ± 0.14b |
D, diameter; PDI, Poly Dispersity Index; ZP, zeta potential; IC, ionic conductivity. Different letters along columns indicate significant differences (p < 0.05, ±SD, n = 3) according to Student–Newman–Keuls test.