Sample No. | Longnan abrasion pH | Lonan exchange pH | Anyuan abrasion pH | Anyuan exchange pH | Dinan abrasion pH | Dinan exchange pH |
1 | 5.47 | 4.34 | 6.13 | 4.3 | 5.7 | 4.5 |
2 | 5.35 | 4.33 | 6.14 | 4.32 | 6.18 | 4.49 |
3 | 5.5 | 4.33 | 6.18 | 4.28 | 5.76 | 4.48 |
4 | 5.74 | 4.39 | 5.92 | 4.43 | 5.72 | 4.72 |
5 | 5.67 | 4.39 | 5.93 | 4.39 | 5.69 | 4.75 |
6 | 5.68 | 4.43 | 6.24 | 4.37 | 5.71 | 4.74 |
Average | 5.57 ± 0.13 | 4.37 ± 0.03 | 6.09 ± 0.11 | 4.35 ± 0.05 | 5.80 ± 0.13 | 4.61 ± 0.12 |