Design and laboratory testing of a chamber device to measure total flux of volatile organic compounds from the unsaturated zone under natural conditions

Journal of Contaminant Hydrology
Fred D Tillman, James A Smith

Abstract

To determine if an aquifer contaminated with volatile organic compounds (VOCs) has potential for natural remediation, all natural processes affecting the fate and transport of VOCs in the subsurface must be identified and quantified. This research addresses the quantification of air-phase volatile organic compounds (VOCs) leaving the unsaturated zone soil gas and entering the atmosphere-including the additional flux provided by advective soil-gas movement induced by barometric pumping. A simple and easy-to-use device for measuring VOC flux under natural conditions is presented. The vertical flux chamber (VFC) was designed using numerical simulations and evaluated in the laboratory. Mass-balance numerical simulations based on continuously stirred tank reactor equations (CSTR) provided information on flux measurement performance of several sampling configurations with the final chamber configuration measuring greater than 96% of model-simulated fluxes. A laboratory device was constructed to evaluate the flux chamber under both diffusion-only and advection-plus-diffusion transport conditions. The flux chamber measured an average of 82% of 15 diffusion-only fluxes and an average of 95% of 15 additional advection-plus-diffusion flux...Continue Reading

References

Jul 10, 1959·Science·R J Millington
Jul 1, 1995·Environmental Science & Technology·C ChenJ A Knuteson
Jul 1, 1988·Environmental Science & Technology·D L Marrin, H B Kerfoot

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Citations

Jul 11, 2012·Environmental Science & Technology·Heonki KimMichael D Annable
May 7, 2013·Environmental Science & Technology·William DoucetteBruce Bugbee
Aug 31, 2011·Journal of the Air & Waste Management Association·Xiang LiDemetrios J Moschandreas
Apr 24, 2012·Journal of Hazardous Materials·Talib R AbbasLi-Ming Yeh
May 2, 2008·Journal of Contaminant Hydrology·Kevin G MumfordSarah E Dickson

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