The Free On-line Aquaculture Dictionary
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The Free On-line Aquaculture Dictionary |
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Alkalinity / Liming Tables |
| Properties of commonly used lime types |
| eq/l alkalinity required for pH shifts |
| kg of different lime types required for pH shift |
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See also acid sulphate soils |
| Chemical formula | Name | g/eq | Solubility | Rate of solubility |
| NaOH | Sodium hydroxide | 40 | High | High |
| Na2CO3 | Sodium Carbonate | 53 | High | High |
| NaHCO3 | Sodium bicarbonate | 83 | High | High |
| CaCO3 | Calcium carbonate | 50 | Moderate | Moderate |
| CaO | Slaked lime | 28 | High | Moderate |
| Ca(OH)2 | Calcium hydroxide (Hydrated lime) | 37 | High | Moderate |
| CaMg(CO3)2 | Dolomite | 46 | Moderate | Slow |
| MgCO3 | Magnesium carbonate | 42 | Moderate | Slow |
| Mg(OH2) | Magnesium hydroxide | 29 | Moderate | Slow |
| pH shift | eq/l |
| 4.5 - 6.5 | 0.0001 |
| 6.5 - 7.0 | 0.0001 |
| 7.0 - 7.5 | 0.00015 |
| 7.5 - 8.0 | 0.0003 |
For example to shift from 6.5 to 7.5 will require 0.0001 + 0.00015eq/l
| pH shift required | NaOH | Na2CO3 | NaHCO3 | CaCO3 | CaO | Ca(OH)2 | CaMg(CO3)2 |
| 4.5 - 6.5 | 4 | 5.3 | 8.3 | 5.0 | 2.8 | 3.7 | 4.6 |
| 4.5 - 7.0 | 6 | 7.95 | 12.5 | 7.5 | 4.2 | 5.6 | 6.9 |
| 4.5 - 7.5 | 8 | 10.6 | 16.6 | 10.0 | 5.6 | 7.4 | 9.2 |
| 5.0 - 7.0 | 4 | 5.3 | 8.3 | 5.0 | 2.8 | 3.7 | 4.6 |
| 5.5 - 7.0 | 2.4 | 3.2 | 5.0 | 3.0 | 1.8 | 2.2 | 2.8 |
| 5.0 - 6.5 | 2 | 2.65 | 4.15 | 2.5 | 1.4 | 1.85 | 2.3 |