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SOIL GAS SAMPLING FOR 1,4-DIOXANE DURING HEATED SOIL VAPOR EXTRACTION
Burris, D.R., P.R. Dahlen, and R.E. Hinchee.
Groundwater Monitoring & Remediation 38(1):85-89(2018)

Soil gas sampling for 1,4-dioxane at elevated soil temperatures, such as those experienced during in situ thermal treatment, has the potential to yield low results due to condensation of water vapor in the ambient temperature sampling vessel and the partitioning of 1,4-dioxane into that condensate. A simple vapor/condensate sampling apparatus was developed to collect both condensate and vapor samples to allow for determination of a reconstituted effective soil gas concentration for 1,4-dioxane. Results using the vapor/condensate sampling apparatus during a heated air injection SVE field demonstration are presented, along with those of a comparable laboratory system. Extraction well effluent sampling at the wellhead by direct vapor canister sampling provided erratic results compared to those of the vapor/condensate apparatus, whereas direct vapor canister sampling of extraction well effluent after the air-water separator provided results reasonably comparable (within 35%) to those using the vapor/condensate apparatus at the wellhead. This paper is temporarily Free Access at http://onlinelibrary.wiley.com/doi/10.1111/gwmr.12255/full.



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