Astm D 4373 Instant
The test operates on a simple acid digestion principle:
The primary purpose of this standard is to measure the relative amount of carbonate compounds in soils. This data is critical for several reasons: astm d 4373
Or directly from a pre-established calibration curve using pure CaCO₃. The test operates on a simple acid digestion
| Step | Action | |------|--------| | 1 | Dry the soil sample at 105°C to a constant mass. | | 2 | Crush soil to pass a No. 200 (75 µm) sieve. | | 3 | Weigh a specimen (typically 1–10 g, depending on expected carbonate content). | | 4 | Place specimen into the reaction vessel. | | 5 | Add HCl (without allowing contact until sealed) into a separate chamber or capsule within the vessel. | | 6 | Seal the gas-measuring apparatus. | | 7 | Tip the apparatus to allow acid to contact the soil. | | 8 | Record the maximum gas pressure or volume reading after reaction stabilizes (usually 1–2 minutes). | | | 2 | Crush soil to pass a No