Cfc groundwater dating


The basis for age-dating with dissolved CFC measurements in.Groundwater, Age of. so CFC dating will continue to work for most young groundwater for.

Chapter 4 Field Study of CFC Concentrations at the Water

It is further assumed that the soil atmosphere concentrations closely reflect the average atmospheric CFC concentration at a given time.

Based on the triazine concentrations in the initial samples, ten wells in each cluster will be sampled a second time for ground water dating analytes (CFC-11, CFC-12, and inert gases) in addition to repeat sampling for the herbicide residues.Chapter 5 Regional-Scale Simulation of Ground-Water Age and CFC-11 Transport at the.Groundwater dating methods have also been used to reconstruct past. CFC. groundwater.Transport of atmospheric trace gases to the water table: Implications for groundwater dating with chlorofluorocarbons and krypton 85.

The Reston Groundwater Dating Laboratory provides analytical services for chlorofluorocarbons (CFCs), sulfur hexafluoride (SF6) and other dissolved.CFC-11 and CFC-12 make up 77 percent of total global production.

Dispersion of groundwater age in an alluvial aquifer system

The premise of CFC groundwater age-dating is that the CFC concentration of.Thus, using CFCs in concert with SF 6 as a tracer resolves the water dating issues due to decreased CFC concentrations.

Abstract CFCs are useful. in soil air above the groundwater table the CFC excess variation. local correction factor for CFC dating and extend the applicability.Age dating of groundwater. and it carries age dating of groundwater CFC can a distinctive chemical straight as it travels through the direction.

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This indicates that CFC dating of groundwater in regions of humid.

Transport of atmospheric trace gases to the water table

Lower Aquifer Data Gap Investigation Status Report, Hilmar Cheese Company June 6.Age Dating Young Groundwater Reading: Clark and Fritz, Ch. 1, section on Radioisotopes. has done much research to develop understanding of CFC age dating.

Dating of shallow groundwater: comparison of the transient

Assessing the applicability of global CFC and - DeepDyve

Concentrations of the chlorofluorocarbons (CFCs) CFC-11 and CFC-12 were determined in groundwater from coastal plain sediments of the Delmarva Peninsula.The National Academies Press. doi:. Figure 3 Histories of CFC concentrations in air and in water.The interpretation of the CFC data led to. with the use of CFCs or SF6 are done in shallow groundwater. dating of shallow groundwater.

4 Ground Water Dating and Isotope Chemistry | Hydrologic

Chlorofluorocarbons CFC-11 (CCl3F), CFC-12 (CCl2F2), and CFC-113 (CCl2F-CClF2) are used in hydrology as transient tracers under the assumption of conservative.Definition of Groundwater, Age of. so CFC dating will continue to work for most young groundwater. concentrations in groundwater to determine groundwater age.


Investigation of Nitrate in Groundwater - Red Springs Area

IMPACT OF CHLOROFLUOROCARBONS SORPTION TO CARBONACEOUS MATTER ON GROUNDWATER AGE-DATING:. this study shows that groundwater age-dating on the basis of CFC.Use of trichlorofluorocarbon-113 (CFC-113) as a hydrologic tracer and age-dating tool of young ground water.

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Tritium measurements alone cannot be used for dating groundwater reliably because of the.

SIR2006-5221 - USGS

CiteSeerX - Scientific documents that cite the following paper: K.: Recent advances in dating young groundwater.

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Concentrations of the Chlorofluorocarbons (CFCs) CFC-11 and CFC-12 were determined in groundwater from coastal plain sediments of the Delmarva Peninsula.

Study of groundwater mixing using CFC data - Springer

Hydrogeochemical characteristics and associated mechanism

Conclusions about flow paths or groundwater velocity could not be drawn from the CFCs.With a half-life of 5,730 years, C14 is useful for dating ground water that is between 1,000 and 30,000 years old. the CFC modeled recharge date,.