Use of chlorofluocarbons to date ground water: a comparison to the tritium method
AuthorSertic (McKay), Kathy Ann
AdvisorMiller, Glenn C.
Geological Sciences and Engineering
AltmetricsView Usage Statistics
The presence of chlorofluorocarbons (CFCs) in ground water indicates the water has been recharged within the last 30-40 years. Therefore, CFCs may be an alternative to tritium for dating ground water. Since atmospheric contamination of samples has been the main operational problem during testing of the CFC method, sampling and analytical techniques designed to reduce the potential for contamination were evaluated. Several problems were encountered with the methodology tested. To evaluate the relationship between CFCs and tritium, ground water samples were collected throughout the Carson River Basin in Western Nevada and analyzed for dichlorodifluoromethane (F-12), trichlorofluoromethane (F-Tl), and tritium. Water with tritium <5 TU (assumed to be older than 40 years) had F-11 concentrations <1.2 pmol/1 and F-12 concentrations <0.7 pmol/1. Water with tritium >10 TU (assumed to be less than 40 years) had F-11 concentrations >2.1 pmol/1 and F-12 concentivations >1.0 pmol/1.
Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives and Public Records through the Library Services and Technology Act (LSTA). To obtain a high quality image or document please contact the DeLaMare Library at https://unr.libanswers.com/ or call: 775-784-6945.
Showing items related by title, author, creator and subject.
Use of major ion chemistry and environmental isotopes to delineate subsurface flow in Eagle Valley, Nevada Szecsody, James Edward (University of Nevada, Reno, 1982)Snow sampling in the main recharge mountains of Eagle Valley indicates non-equilibrium fractionation of stable isotopes from: 6D/H = 6.0 ( 618o/160)-14 . There is significant correlation of isotopic depletion with elevation ...
Geothermal resources of the western Black Rock Desert, northwestern Nevada: Hydrology and aqueous geochemistry Welch, Alan Herbert (University of Nevada, Reno, 1985)The western Black Rock Desert includes several systems, some of which exceed 150 and may reach 200 degrees Celsius at depth based on chemical geothermometry. Geochemical and isotopic data, used in conjunction with hydrologic ...
Evaluation of factors influencing the inorganic water-quality regimen of Carson River, Carson Valley, Nevada-California Spane, Frank A., Jr. (University of Nevada, Reno, 1977)Carson River exhibits a significant increase with respect to dissolved solids concentration as it flows through Carson Valley. The increase in dissolved solids is particularly evident during late summer and early fall ...