Astm - D 4373 =link=

[ \textCarbonate (%) = \frac\textCO_2 \text pressure/volume reading\textDry soil mass \times \textCalibration factor ]

Or directly from a pre-established calibration curve using pure CaCO₃. astm d 4373

The method relies on the chemical reaction between carbonates present in the soil and hydrochloric acid (HCl). The reaction produces carbon dioxide (CO₂) gas. astm d 4373

D4373 – 14 (or current active version: 2021) astm d 4373

1. Title Standard Test Method for Rapid Determination of Carbonate Content of Soils