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J Environ Manage

Title:		Effect of vapour-solid interfacial adsorption on benzene multiphase partition and its implication to vapour exposure assessment of contaminated soil in arid area
Author(s):		Zhang R; Zhong M; Jiang L; Fu Q; Wang S; Zhang W; Li X; Ma L;
Address:		"National Engineering Research Centre of Urban Environmental Pollution Control, Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, Beijing Municipal Research Institute of Eco-Environmental Protection, Beijing, 100037, China. National Engineering Research Centre of Urban Environmental Pollution Control, Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, Beijing Municipal Research Institute of Eco-Environmental Protection, Beijing, 100037, China. Electronic address: jianglin@cee.cn"
Journal Title:		J Environ Manage
Year:		2022
Volume:		20220505
Issue:
Page Number:		115182 -
DOI:		10.1016/j.jenvman.2022.115182
ISSN/ISBN:		1095-8630 (Electronic) 0301-4797 (Linking)
Abstract:		"The partitioning of volatile organic compounds (VOCs) in soil multiphase system is a critical process for vapour intrusion, however, the importance of vapour-solid interface adsorption doesn't receive the due attention, which causes the exposure assessment too conservative particularly in arid conditions. This paper proposed a multiphase partitioning equilibrium (MPE) model establishing the quantitative relationship between VOCs and its various partitioning phases in soil, including solid-liquid interface adsorption phase, vapour phase and dissolved phase and vapour-solid interface adsorption phase. Taking benzene as the targeted pollutant, the model was found in good agreement with the experimental data while the errors were within one magnitude basically. The role of vapour-solid interface adsorption under different soil moisture conditions was also investigated by the model. The results reveals that a) soil moisture is the conspicuous controlling factor that affects the benzene partitioning in soil; b) vapour-solid interface adsorption dominates benzene uptake when soil relative saturation (RS) is under 20% among three typical soils; c) as adsorption by soil minerals (vapour-solid interface adsorption) is reduced by increasing amounts of humidity (RS > 20%), uptake by partitioning into the soil organic matter (OM) increasingly becomes a controlling factor; d) the common sense that vapour concentration of benzene is particularly high with low level of RS may not occur since the vapour-solid interface adsorption dominates benzene uptake in arid environment. The MPE model is suitable for prediction of VOCs partitioning and vapour exposure risk assessment of contaminated soil in arid area"
Keywords:		Adsorption Benzene Environmental Pollution Gases Soil *Soil Pollutants/analysis *Volatile Organic Compounds Contaminated soil Moisture Organic matter Organic pollutants Partitioning;
Notes:		"MedlineZhang, Ruihuan Zhong, Maosheng Jiang, Lin Fu, Quankai Wang, Shijie Zhang, Wenyu Li, Xiaoyan Ma, Lin eng England 2022/05/09 J Environ Manage. 2022 Aug 1; 315:115182. doi: 10.1016/j.jenvman.2022.115182. Epub 2022 May 5"