Calciumcarbonate content
Last modified by TerraIndex TerraIndex on 2021/09/30 15:20
Calcium carbonate content
To determine the amount of chalk (CaCO3) present in a soil sample one needs to use hydrochloric acid (10% HCl) and drip this on the sample. The amount of fizzing is the indication for the amount of chalk present. One must take into consideration that the fizzing is also determined by the speed of the hydrochloric acid in the sediment. For example: sand will give a quicker and more violent fizzing than clay, but clay will fizz for a longer time.
Amount of calcium
Indicator | Reaction 10% HCl |
|---|---|
| Calcium free | No fizzing, less than 0.5% CaCO3 |
| Low calcium | Audible fizzing, about 0.5% CaCO3 |
| Slightly calcareous | Audible fizzing and very less visible, about 1 % CaCO3 |
| Calcareous | Audible fizzing and less visible, about 2% CaCO3 |
| Calcium rich | Visible fizzing, more than 1 or 2% CaCO3 |
References
- NEN-EN-ISO 14688-1:2019
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