Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026667 |
A Mathematical Model for the Release, Transport, and Retention of Per- and Polyfluoroalkyl Substances (PFAS) in the Vadose Zone | |
Guo, Bo1; Zeng, Jicai1; Brusseau, Mark L.1,2 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Per- and polyfluoroalkyl substances (PFAS) are emerging contaminants of critical concern. As surfactants, PFAS tend to accumulate at air-water interfaces and may stay in the vadose zone for long times before contaminating groundwater. Yet not well understood, the extent of retention in the vadose zone has critical implications for risk management and remediation strategies. We present the first mathematical model that accounts for surfactant-induced flow and solid-phase and air-water interfacial adsorption. We apply the model to simulate PFOS (a PFAS compound of primary concern) transport in the vadose zone at a model fire-training area site impacted by aqueous film-forming foam (AFFF). Air-water interfacial adsorption is shown to have a significant impact-amplified by the low water content due to gravity drainage-total retardation factors range from 233 to 1,355 for the sand and 146 to 792 for the soil used in the study. The simulations illustrate it can take several decades or longer for PFOS to reach groundwater. Counterintuitively, the lower water content in the sand-due to stronger drainage and weaker capillary retention-leads to retardation factors greater than for the soil. Also, most PFOS is adsorbed at air-water interfaces with only 1-2% in the aqueous phase. The implications include (1) fine-texture materials could have lower retardation factors than sand due to higher retained water content, (2) soil PFAS concentrations are likely to be orders of magnitude higher than those in groundwater at source zones. Both implications are consistent with recent field observations at hundreds of AFFF-impacted sites. |
英文关键词 | PFAS PFOS air-water interface variably saturated flow retardation transport |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800023 |
WOS关键词 | WATER INTERFACIAL AREA ; SURFACTANT-ENHANCED SOLUBILIZATION ; SATURATED POROUS-MEDIA ; PERFLUORINATED SURFACTANTS ; HYDRAULIC CONDUCTIVITY ; ADSORPTION-KINETICS ; CAPILLARY-PRESSURE ; RESIDUAL DODECANE ; SOLUTE TRANSPORT ; UNSATURATED FLOW |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280544 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85724 USA; 2.Univ Arizona, Dept Environm Sci, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Guo, Bo,Zeng, Jicai,Brusseau, Mark L.. A Mathematical Model for the Release, Transport, and Retention of Per- and Polyfluoroalkyl Substances (PFAS) in the Vadose Zone[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Guo, Bo,Zeng, Jicai,&Brusseau, Mark L..(2020).A Mathematical Model for the Release, Transport, and Retention of Per- and Polyfluoroalkyl Substances (PFAS) in the Vadose Zone.WATER RESOURCES RESEARCH,56(2). |
MLA | Guo, Bo,et al."A Mathematical Model for the Release, Transport, and Retention of Per- and Polyfluoroalkyl Substances (PFAS) in the Vadose Zone".WATER RESOURCES RESEARCH 56.2(2020). |
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