Articles | Volume 21, issue 23
https://doi.org/10.5194/bg-21-5381-2024
https://doi.org/10.5194/bg-21-5381-2024
Research article
 | 
29 Nov 2024
Research article |  | 29 Nov 2024

Evaluating adsorption isotherm models for determining the partitioning of ammonium between soil and soil pore water in environmental soil samples

Matthew G. Davis, Kevin Yan, and Jennifer G. Murphy

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Cited articles

Alnsour, N. I.: Bi-Directional Exchange of Ammonia from Soils in Row Crop Agro-ecosystems, PhD thesis, North Carolina State University, http://www.lib.ncsu.edu/resolver/1840.20/37245 (last access: 27 November 2024), 2020. 
Bache, B. W.: The measurement of cation exchange capacity of soils, J. Sci. Food Agr., 27, 273–280, https://doi.org/10.1002/jsfa.2740270313, 1976. 
Bash, J. O., Cooter, E. J., Dennis, R. L., Walker, J. T., and Pleim, J. E.: Evaluation of a regional air-quality model with bidirectional NH3 exchange coupled to an agroecosystem model, Biogeosciences, 10, 1635–1645, https://doi.org/10.5194/bg-10-1635-2013, 2013. 
Bouwman, A. F., Lee, D. S., Asman, W. A. H., Dentener, F. J., Hoek, K. W. Van Der, Olivier, J. G. J., Tg, N., and Tg, N.: A global high-resolution emission inventory for ammonia, Global Biogeochem. Cy., 11, 561–587, 1997. 
Chu, K. H.: Revisiting the Temkin Isotherm: Dimensional Inconsistency and Approximate Forms. Industrial and Engineering Chemistry Research, 60, 13140–13147, https://doi.org/10.1021/acs.iecr.1c01788, 2021. 
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Short summary
Ammonia applied as fertilizer can volatilize into the atmosphere. This can threaten vulnerable ecosystems and human health. We investigated the partitioning of ammonia between an immobile adsorbed phase and mobile aqueous phase using several adsorption models. Using the Temkin model we determined that previous approaches to this issue may overestimate the quantity available for exchange by a factor of 5–20, suggesting that ammonia emissions from soil may be overestimated.
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