The method relies on the chemical reaction between carbonates present in the soil and hydrochloric acid (HCl). The reaction produces carbon dioxide (CO₂) gas.
A calibrated manometric or volumetric device (typically a or similar gas-measuring apparatus) measures the pressure or volume of CO₂ evolved. This measurement is directly proportional to the CaCO₃ content, which is expressed as a percentage of the dry soil mass. astm d 4373
Method: ASTM D4373 – 2021 Analyst: [Name] Date: [Current Date] The method relies on the chemical reaction between
[ \textCarbonate (%) = \frac\textCO_2 \text pressure/volume reading\textDry soil mass \times \textCalibration factor ] This measurement is directly proportional to the CaCO₃
| Sample ID | Dry Mass (g) | CO₂ Reading (mL) | CaCO₃ Equivalent (%) | |-----------|--------------|------------------|------------------------| | S-01 (CL) | 5.00 | 38.5 | 10.2 | | S-02 (GW) | 10.00 | 122.0 | 32.8 |