Sorption of pure N2O to biochars and other organic and inorganic materials under anhydrous conditions

Environmental Science & Technology
Gerard CornelissenColleen E Rostad

Abstract

Suppression of nitrous oxide (N2O) emissions from soil is commonly observed after amendment with biochar. The mechanisms accounting for this suppression are not yet understood. One possible contributing mechanism is N2O sorption to biochar. The sorption of N2O and carbon dioxide (CO2) to four biochars was measured in an anhydrous system with pure N2O. The biochar data were compared to those for two activated carbons and other components potentially present in soils-uncharred pine wood and peat-and five inorganic metal oxides with variable surface areas. Langmuir maximum sorption capacities (Qmax) for N2O on the pine wood biochars (generated between 250 and 500 °C) and activated carbons were 17-73 cm(3) g(-1) at 20 °C (median 51 cm(3) g(-1)), with Langmuir affinities (b) of 2-5 atm(-1) (median 3.4 atm(-1)). Both Qmax and b of the charred materials were substantially higher than those for peat, uncharred wood, and metal oxides [Qmax 1-34 cm(3) g(-1) (median 7 cm(3) g(-1)); b 0.4-1.7 atm(-1) (median 0.7 atm(-1))]. This indicates that biochar can bind N2O more strongly than both mineral and organic soil materials. Qmax and b for CO2 were comparable to those for N2O. Modeled sorption coefficients obtained with an independent polypar...Continue Reading

References

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Citations

Feb 7, 2001·Proceedings of the National Academy of Sciences of the United States of America·S J SowerbyN G Holm
Aug 7, 2004·Environmental Science & Technology·Gerard CornelissenOrjan Gustafsson
Jun 15, 2005·Environmental Science & Technology·Gerard CornelissenOrjan Gustafsson
Sep 30, 2005·Environmental Science & Technology·Christine M RothRené P Schwarzenbach
Feb 24, 2006·Environmental Toxicology and Chemistry·Hans Peter H ArpRené P Schwarzenbach
May 15, 2007·Nature·Johannes Lehmann
Apr 28, 2011·Journal of Environmental Quality·Arezoo Taghizadeh-ToosiRobin A Craigie
Nov 19, 2011·FEMS Microbiology Ecology·Peter DörschLars Reier Bakken
Jul 4, 2012·Journal of Environmental Quality·Claudia KammannChristoph Müller

Related Concepts

Thermodynamics
Organic Chemicals
Salvelinus
Inorganic Chemicals
Visual Suppression
Biochar
Metabolic Suppression
Carbon Dioxide
Nitrous Oxide
Actidose

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