Difluoromethane as Partitioning Tracer to Estimate Vadose Water Saturations
Publication: Journal of Environmental Engineering
Volume 125, Issue 7
Abstract
Water saturation in the vadose zone is an important parameter for many nonaqueous phase liquid (NAPL) remediation technologies. Conventional soil boring analyses may not provide accurate average water saturation data. Previous studies have shown that a partitioning interwell tracer test (PITT) can provide an accurate estimate of average subsurface NAPL saturations. The PITT is proposed as a suitable technology for estimating average subsurface water saturations. In this research, difluoromethane was evaluated as a suitable tracer compound to partition among air, water, and NAPL phases. Method of moments analyses were used to develop equations necessary to determine water saturations from difluoromethane PITT results. One-dimensional column experiments provided air-water and air-NAPL partition coefficient data for difluoromethane. Difluoromethane is shown to be a suitable tracer for use in field PITTs to predict water saturations in the vadose zone.
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References
1.
Annable, M. D., Jawitz, J. W., Rao, P. S., Dai, D. P., Kim, H., and Wood, A. L. (1998). “Field evaluation of interfacial and partitioning tracers for characterization of effective NAPL-water contact areas.” Ground Water, 36(3), 495–501.
2.
Brown, C. L., Delshad M., Dwarakanath, V., McKinney, D. C., and Pope, D. C. (1996). “Design of a field-scale surfactant enhanced remediation of a DNAPL contaminated aquifer.” I&EC Spec. Symp., American Chemical Society, Washington, D.C., 435–440.
3.
Deeds, N. E. ( 1997). “Application of a partitioning interwell tracer test to characterization of the unsaturated zone,” Master's Rep., Department of Civil Engineering, University of Texas at Austin.
4.
Deeds N. E., Pope, G. A., and McKinney, D. C. (1999). “Laboratory characterization of NAPL/tracer interaction in support of a vadose zone partitioning interwell tracer test.” J. Contaminant Hydro., in press.
5.
Himmelblau, D. M., and Bischoff, K. B. (1968). Process analysis and simulation: Deterministic systems. Wiley, New York.
6.
Jin, M. ( 1995). “A study of nonaqueous phase liquid characterization and surfactant remediation,” PhD dissertation, Dept. of Petroleum and Geosystems Engrg., University of Texas at Austin, Austin, Tex.
7.
Jin, M., et al. (1995). “Partitioning tracer test for detection, estimation and remediation performance assessment of subsurface nonaqueous phase liquids.” Water Resour. Res., 31(5), 1201.
8.
Jin, M., et al. (1997). “Sensitivity models and design protocol for partitioning tracer tests in alluvial aquifers.” Ground Water, 35(6), 964–972.
9.
Mayer, A. S., and Miller, C. T. (1990). “The influence of porous medium characteristics and measurement scale on pore-scale distributions of residual non-aqueous phase liquids.” J. Contaminant Hydro., 6, 107.
10.
Nelson, N., and Brusseau, M. (1996). “Field study of the partitioning tracer method for detection of dense nonaqueous phase liquid in trichloroethylene-contaminated aquifer.” Envir. Sci. and Technol., 30(9), 2859.
11.
Whitley, G. A. ( 1997). “An investigation of partitioning tracer for characterization of nonaqueous phase liquids in the vadose zones,” PhD dissertation, University of Texas at Austin.
12.
Whitley, G. A., Pope, G. A., McKinney D. C., Rouse, B. A., and Mariner, P. E. (1995). “Vadose zone nonaqueous phase liquid characterization using partitioning gas tracer.” Proc., 3rd Int. Symp. on In-Situ and On-Site Bioreclamation, Battelle Press, Columbus, Ohio, 211.
13.
Wilson, R. D., and Mackay, D. M. (1995). “Direct detection of residual nonaqueous phase liquid in the saturated zone using SF6 as a partitioning tracer.” Envir. Sci. and Technol., 29(5), 1255.
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Received: May 13, 1998
Published online: Jul 1, 1999
Published in print: Jul 1999
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