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Environ Sci Technol

Title:		Bubble-Facilitated VOC Transport from LNAPL Smear Zones and Its Potential Effect on Vapor Intrusion
Author(s):		Soucy NC; Mumford KG;
Address:		"Department of Civil Engineering, Queen's University , Kingston, Ontario Canada , K7L 3N6"
Journal Title:		Environ Sci Technol
Year:		2017
Volume:		20170210
Issue:		5
Page Number:		2795 - 2802
DOI:		10.1021/acs.est.6b06061
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Most conceptual and mathematical models of soil vapor intrusion assume that the transport of volatile organic compounds (VOCs) from a source toward a building is limited by diffusion through the soil gas. Under conditions where advection occurs, transport rates are higher and can lead to higher indoor air concentrations. Advection-dominated conditions can be created by gas bubble flow in the saturated zone. A series of laboratory column experiments were conducted to measure mass flux due to bubble-facilitated VOC transport from light nonaqueous phase liquid (LNAPL) smear zones. Smear zones that contained both LNAPL residual and trapped gas, as well as those that contained only LNAPL residual, were investigated. Results showed that the VOC mass flux due to bubble-facilitated transport was orders-of-magnitude higher than under diffusion-limited conditions. Results also showed that the mass flux due to bubble-facilitated transport was intermittent, and increased with an increased supply of dissolved gases"
Keywords:		"Diffusion *Gases Models, Theoretical Soil *Volatile Organic Compounds;"
Notes:		"MedlineSoucy, Nicole C Mumford, Kevin G eng Research Support, Non-U.S. Gov't 2017/01/24 Environ Sci Technol. 2017 Mar 7; 51(5):2795-2802. doi: 10.1021/acs.est.6b06061. Epub 2017 Feb 10"