Methodological and experimental studies of the abiotic uptake of gaseous substances by organic soils were performed. The static adsorption method of closed vessels for assessing the interaction of gases with the solid and liquid soil phases and the dynamic method of determining the sorption isotherms of gases by soils were analyzed. The theoretical substantiation of the methods and their practical implementations on the basis of a PGA-7 portable gas analyzer (Russia) were considered. Good agreement between the equilibrium sorption isotherms of the gases and the Langmuir model was revealed; for the real ranges of natural gas concentrations, this model can be reduced to the linear Henry equation. The limit values of the gas sorption (Langmuir monolayer capacity) are typical for dry samples; they vary from 670–4000 g/m3 for methane and oxygen to 20 000–25 000 g/m3 for carbon dioxide. The linear distribution coefficients of gases between the solid and gas phases of organic soils (Henry constants) are 8–18 units for poorly sorbed gases (O2, CH4) and 40–60 units for CO2. The kinetics of the chemicophysical uptake of gases by the soil studied is linear in character and obeys the relaxation kinetic model of the first order with the corresponding relaxation constants, which vary from 1 h −1 in wet samples to 10 h −1 in dry samples.
KeywordsSorption Isotherm EURASIAN Soil Science Organic Soil Elution Curve Henry Constant
Unable to display preview. Download preview PDF.
- 1.A. V. Smagin, Gaseous Phase of Soils (Moscow, 2005) [in Russian].Google Scholar
- 2.A. V. Smagin, N. B. Sadovnikova, and Mizuri Maauia Ben-Ali. “The Determination of the Primary Hydrophysical Function of Soil by the Centrifuge Method,” Pochvovedenie, No. 11, 1362–1370 (1998) [Eur. Soil Sci. 31 (11), 1237–1244 (1998)].Google Scholar
- 3.A. V. Smagin, N. B. Sadovnikova, D. D. Khaidapova, and E. M. Shevchenko, Ecological Assessment of the Biophysical State of Soils (Moscow, 1999) [in Russian].Google Scholar
- 4.A. V. Smagin and G. V. Smirnov, “Use of Gas Chromatography to Determine the Sorption Isotherms of Water Vapor by Soil,” Pochvovedenie, No. 9, 155–158 (1991).Google Scholar
- 5.A. V. Kiselev and Ya. I. Yashin, Gas-Adsorption Chromatography (Nauka, Moscow, 1967) [in Russian].Google Scholar