EN ISO 10693:2014 PDF

Overview

EN ISO 10693:2014 (ISO 10693:1995) specifies a volumetric method for the determination of carbonate content in air-dried soil samples. The procedure uses acid decomposition of carbonates and quantifies the evolved carbon dioxide with a Scheibler apparatus. The carbonate content is reported as an equivalent concentration of calcium carbonate (CaCO3) and applies to all types of air-dried soils prepared according to ISO 11464.

Key Topics

• Principle: Hydrochloric acid reacts with carbonates to release CO2. The gas volume is measured and compared with CaCO3 standards to calculate carbonate content.
• Primary equipment: Scheibler apparatus (single-sample unit), reaction vessels (~150 ml), plastic cups (~10 ml), calibrated U-tube, storage vessel with water, stop-cocks and an analytical balance (accuracy 0.1 mg).
• Reagents and materials: Analytical-grade water (conductivity ≤ 0.2 mS/m at 25 °C), hydrochloric acid c(HCl) = 4 mol/l (prepared by diluting 340 ml concentrated HCl to 1 000 ml), and calcium carbonate powder as standard.
• Sample prep: Use the