Development of Radon-222 as Natural Tracer for Monitoring the Remediation of NAPL in the Subsurface
Naturally occurring 222-radon in ground water can potentially be used as an in situ partitioning tracer to characterize dense nonaqueous phase liquid (DNAPL) saturations. The static method involves comparing radon concentrations in water samples from DNAPL-contaminated and non-contaminated portions of an aquifer. During a push-pull test, a known volume of test solution (radon-free water containing a conservation tracer) is first injected (''pushed'') into a well; flow is then reversed and the test solution/groundwater mixture is extracted (''pulled'') from the same well. In the presence of NAPL radon transport is retarded relative to the conservative tracer. Assuming linear equilibrium partitioning, retardation factors for radon can be used to estimate NAPL saturations.The utility of this methodology was evaluated in laboratory and field settings.
- Research Organization:
- Oregon State University/Dept of Chemical Engineering (US)
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG07-97ER62523
- OSTI ID:
- 809809
- Report Number(s):
- DOE/ER/62523; Project no. 60158; TRN: US0302596
- Resource Relation:
- Other Information: PBD: 27 Feb 2003
- Country of Publication:
- United States
- Language:
- English
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