Magnetic Resonance Imaging of Nonaqueous Phase Liquid Distribution in Unconsolidated Soils Using Discriminatory Freezing
| Autor: | Benjamin Kohn, A. Ted Watson, Tom Sale, Saeed Kiaalhosseini, Jens Blotevogel |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Petroleum engineering
0207 environmental engineering 02 engineering and technology 010501 environmental sciences 01 natural sciences Coring Human health Lead (geology) Liquid state Imaging Tool Phase (matter) Soil water Environmental science 020701 environmental engineering Porous medium 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Groundwater Monitoring & Remediation. 39:71-75 |
| ISSN: | 1745-6592 1069-3629 |
| DOI: | 10.1111/gwmr.12323 |
| Popis: | Organic contaminants present as nonaqueous phase liquids (NAPLs) in the subsurface often pose a long‐term risk to human health and the environment. Investigating the distribution of NAPLs in porous media remains a major challenge in risk assessment and management of contaminated sites. Conventional soil coring and monitoring wells have been widely used over past decades as the primary means of subsurface investigation to determine NAPL extent. Known limitations of conventional approaches have led us to explore an alternative or a complementary technique to provide high‐quality information of NAPL source zone architecture. This work advances an imaging tool for a variety of organic NAPL contaminants in unconsolidated soils through magnetic resonance imaging (MRI) of frozen cores. Using trichloroethylene (TCE) and o‐xylene as model species, we illustrate that discriminatory freezing of water, while keeping the NAPL in a liquid state, enables high‐resolution qualitative delineation of NAPL distribution within porous media. This novel approach may help improve site conceptual models and consequentially lead to highly tailored, more efficient remedial measures. |
| Databáze: | OpenAIRE |
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