A simple method for measuring the carbonate content of soils
2005
Horváth, Balázs | Opara-Nadi, Oliver | Beese, Friedrich
The traditional measurement of the carbonate content of soils with the Scheibler apparatus is slow and labor intensive. Our objective was to develop a relatively simple and accurate method. The pressure calcimeter principle was used; the pressure change caused by the reaction between HCl and a weighed soil sample was measured with a digital plunge-in manometer through a silicone-rubber septum placed on a screw-capped tube. The method was calibrated with pure CaCO₃ The correlation between the measured and weighed amounts was excellent (r ² = 0.999). The carbonate content of a natural soil sample was measured 10 times; the coefficient of variation was 1.9%. Ten ISE (International Soil-Analytical Exchange) samples were analyzed with this method which contained a carbonate content of 3 to 170 g kg⁻¹ Satisfactory results were obtained, indicating the suitability of the proposed method for practical purposes.
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