| Preliminary storage (1 day in wet conditions + 6 days under water coating) | The following storage | |
28 days in water | 28 days in Na2SO4 | ||
Reference sample | 1.00* 0.69 0.16 | 1.02 1.09 0.29 | 1.96 0.68 0.16 |
Al(OH)3 | 1.37 1.31 0.26 | 1.40 1.72 0.42 | 3.14 0.81 0.11 |
Al2(SO4)3 | 2.46 0.92 0.17 | 2.52 1.25 0.36 | 3.92 0.78 0.08 |
Al2(SO4)3 + FeSO4 | 1.59 0.47 0.20 | 1.53 0.95 0.22 | 3.17 0.13 0.00 |