Adsorption Kinetics of Toluene on Soil Agglomerates:  Soil as a Biporous Sorbent

Arocha, Marco A.; Jackman, Alan P.; McCoy, Benjamin J.

doi:10.1021/es9504294

Cited by 27 publications

(24 citation statements)

References 35 publications

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“…Adsorption and desorption of organic compounds can occur in both vapor and dissolved phases (Breus & Mishchenko, 2006;Ruiz et al, 1998). Organic vapors adsorb to soil particles through their affinity for ionically charged surfaces (Arocha et al, 1996;Morrissey & Grismer, 1999;Petersen et al, 1995). Total soil surface area (determined by soil particle size, particle density, and porosity) regulates soil adsorption capacities for organic gases (Petersen et al, 1994).…”

Section: Adsorption-desorptionmentioning

confidence: 99%

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Tang

Schurgers

Rinnan

2019

Reviews of Geophysics

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Biogenic volatile organic compounds (BVOCs) can be released from soils to the atmosphere through microbial decomposition of plant residues or soil organic carbon, root emission, evaporation of litter‐stored BVOCs, and other physical processes. Soils can also act as a sink of BVOCs through biotic and abiotic uptake. Currently, the source and sink capabilities of soils have not been explicitly accounted for in global BVOC estimates from the terrestrial biosphere. In this review, we summarize the current knowledge of soil BVOC processes and aim to propose a generic framework for modelling soil BVOCs based on current understanding and data availability. To achieve this target, we start by reviewing measured sources and sinks of soil BVOCs and summarize commonly reported compounds. Next, we strive to disentangle the drivers for the underlying biotic and abiotic processes. We have ranked the list of compounds, known to be emitted from soils, based on our current understanding of how each process controls emission and uptake. We then present a modelling framework to describe soil BVOC emissions. The proposed framework is an important step toward initializing modelling exercises related to soil BVOC fluxes. Finally, we also provide suggestions for measurements needed to separate individual processes, as well as explore long‐term and large‐scale patterns in soil BVOC fluxes.

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Section: Adsorption-desorptionmentioning

confidence: 99%

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Tang

Schurgers

Rinnan

2019

Reviews of Geophysics

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“…Arocha et al [16] studied the adsorption kinetics of toluene on two soil agglomerates, Yolo silt loam and Na-montmorillonite, and indicated that soil was a biporous sorbent. Arocha et al [16] studied the adsorption kinetics of toluene on two soil agglomerates, Yolo silt loam and Na-montmorillonite, and indicated that soil was a biporous sorbent.…”

Section: Sorption Kinetics Of Toluene In Ca-montmorillonitementioning

confidence: 99%

“…The gravimetric method with a microbalance has been used to trace the time courses of sorption of VOCs on soil organic matter [13][14][15] and on oven-dried clay [16,17], all under dry conditions. However, the major constraint associated with gravimetric methods for the investigation of sorption dynamics is the inability to observe the behavior at the molecular level or under a wet condition.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of toluene sorption and desorption in Ca- and Cu-montmorillonites investigated with Fourier transform infrared spectroscopy under two different levels of humidity

Shih

2004

Environmental Toxicology and Chemistry

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Clays in soils or groundwater aquifer materials play roles in the sorption of organic pollutants. The intrinsic sorption kinetics of toluene in dry and humid clay films was investigated by tracking the change of infrared absorbance. Under the humid condition, similar toluene-sorbed intensities were found in Ca- and Cu-montmorillonites. However, a higher intensity of sorbed toluene was found in the Cu-form than in the Ca-form under the dry condition, which indicates a stronger interaction occurring in dry Cu-montmorillonite. The general time scale of sorption of toluene on clays is around 100 s. In both forms of montmorillonite, some portion of toluene was desorbed at an extremely slow rate under the dry condition. Some newly identified peaks were persistent against desorption from montmorillonites, suggesting the existence of irreversibly sorbed species and the possibility of toluene transformation occurring in clay systems.

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“…A few studies have been devoted to the desorption kinetics of volatiles from smectites to the gas phase (Shih and Wu, 2004;Chang et al, 2003;Bray and Redfern, 1999;Keyes and Silicox, 1994;Arocha et al, 1996;Siepmann et al, 1998;Steinberg et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Desorption of Water, Ethanol, Ethyl Acetate, and Toluene from a Montmorillonite

Clausen

Meier²,

Hughes

et al. 2013

Clays and clay miner.

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Desorption processes of low-molecular-weight compounds from the surface of smectites into the gas phase determine a number of processes, e.g. those involved in drug delivery and the release of herbicides. The desorption has not been investigated thoroughly and is not well understood. The present study was undertaken in order to understand better the factors influencing these desorption mechanisms. Starting with a very pure standard (Na + -rich) montmorillonite (Kunipia-F), which was exchanged against cations with different hydration properties (Ca 2+ , Li + , phenyltrimethylammonium, hexyltrimethylammonium), the experiments explored the rate of desorption of volatiles with different chemical functionalities (water, ethanol, ethyl acetate, and toluene). The desorption was monitored by thermogravimetry and differential scanning calorimetry under isothermal conditions, and by ramping the temperature at a constant rate. The experiments were compared with numerical calculations based on finite-element methods and with analytical models. These data point to a two-step mechanism where the desorption follows the curve of the equilibrium desorption isotherms of those molecules on the montmorillonite. The bulk-like volatiles (i.e. volatiles with release kinetics close to that of the bulk liquids) were desorbed in a first step. With a decrease in the degree of coverage of the volatile on the montmorillonite, the desorption was increasingly dominated by the strength of interaction between the volatile and the interlayer cations of the montmorillonite.

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Adsorption Kinetics of Toluene on Soil Agglomerates: Soil as a Biporous Sorbent

Cited by 27 publications

References 35 publications

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Kinetics of toluene sorption and desorption in Ca- and Cu-montmorillonites investigated with Fourier transform infrared spectroscopy under two different levels of humidity

Kinetics of Desorption of Water, Ethanol, Ethyl Acetate, and Toluene from a Montmorillonite

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