Changes in CO2 Absorption Efficiency of NaOH Solution Trap with Temperature

다국어 초록 (Multilingual Abstract)

Under the projected global warming, release of carbon as CO2 through soil organic matter decomposition isexpected to increase. Therefore, accurate measurement of CO2 released from soil is crucial in understanding thesoil carbon dynamics under increased temperature conditions. Sodium hydroxide (NaOH) traps are frequentlyused in laboratory soil incubation studies to measure soil respiration rate, but decreasing CO2 gas solubilitywith increasing temperature may render the reliability of the method questionable. In this study, the influencesof increasing temperature on the CO2 capture capacity of NaOH traps were evaluated under 5~35°Ctemperature range at 10°C interval. Two closed-chamber experiments were performed where NaOH traps wereused to capture CO2 either released from acidified Na2CO3 solution or directly injected into the chamber. Thesorption of ambient CO2 within the incubators into NaOH traps was also measured. The amount CO2 capturedincreased as temperature increased within 2 days of incubation, suggesting that increased diffusion rate of CO2at higher temperatures led to increases in CO2 captured by the NaOH traps. However, after 2 days, over 95% ofCO2 emitted in the emission-absorption experiment was captured regardless of temperature, demonstratinghigh CO2 absorption efficiency of the NaOH traps. Thus, we conclude that the influence of decreased CO2solubility by increased temperatures is negligible on the CO2 capture capacity of NaOH traps, supporting thatthe use of NaOH traps in the study of temperature effect on soil respiration is a valid method.

참고문헌 (Reference)

1 전병준, "용존유기탄소의 δ13 C 분석시 고형화 전처리 방법 비교: 알칼린 과황산칼륨산화-탄산침전과 동결건조" 한국환경농학회 36 (36): 113-118, 2017

2 Raich, J.W., "The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate" 44 (44): 81-99, 1992

3 Fang, C., "The dependence of soil CO2 efflux on temperature" 33 : 155-165, 2001

4 Reid, R. C., "The Properties of Gases and Liquids" McGraw-Hill 1987

5 Haney, R. L., "Soil CO2 respiration: Comparison of chemical titration, CO2 IRGA analysis and the Solvita gel system" 23 (23): 171-176, 2008

6 Müller, E., "Soil CO2 evolution rates in the field-a comparison of three methods" 57 (57): 597-608, 2010

7 Lucretia, A. S., "Rapid and cost-effective method for soil carbon mineralization in static laboratory incubations" 43 : 958-972, 2012

8 Shell Internationale Petroleum Maatschappij BV, "Physical and Engineering Data"

9 Lim, S. S., "Nitrogen, carbon, and dry matter losses during composting of livestock manure with two bulking agents as affected by co-amendments of phosphogypsum and zeolite" 102 : 280-290, 2017

10 Rottmann, N., "Microbial use and decomposition of maize leaf straw incubated in packed soil columns at different depths" 46 : 27-33, 2009

11 Rottmann, N., "Measuring the CO2 production from maize-straw-amended soil columns-a comparison of four methods" 174 : 373-380, 2011

12 Boutton, T.W., "Mass Spectrometry of Soils" Marcel Dekker 47-82, 1996

13 Belgodere, C., "Experimental determination of CO2 diffusion coefficient in aqueous solutions under pressure at room temperature via Raman spectroscopy: impact of salinity (NaCl)" 46 : 1025-1032, 2015

14 Cadogan, S. P., "Diffusion coefficients of CO2 and N2 in water at temperatures between 298.15 K and 423.15 K at pressures up to 45 MPa" 59 : 51-525, 2014

15 Lindsey, E. R., "Controls on soil respiration: Implications for climate change" 48 : 1-6, 2000

16 Edwards, N.T., "Continuous measurement of carbon dioxide evolution from partitioned forest components" 54 : 406-412, 1973

17 Harris, S., "Continuous flow isotope ratio mass spectrometry of carbon dioxide trapped as strontium carbonate" 28 : 747-757, 1997

18 Bruno, G., "Compound-specific stable-isotope (δ13C) analysis in soil science" 168 : 633-648, 2005

19 Lim, S. S., "Carbon mineralization and retention of livestock manure composts with different substrate qualities in three soils" 12 : 312-322, 2012

20 David, R.L., "CRC Handbook of Chemistry and Physics" CRC Press 1991