Age dating ground water by use of chlorofluorocarbons (CCl{sub 3}F and CCl{sub 2}F{sub 2}), and distribution of chlorofluorocarbons in the unsaturated zone, Snake River Plain aquifer, Idaho National Engineering Laboratory, Idaho

Busenberg, Eurybiades; Weeks, Edwin P.; Plummer, L. Niel; Bartholomay, Roy C.

doi:10.2172/10177237

Cited by 68 publications

(43 citation statements)

References 42 publications

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“…12B). Using the method proposed by Plummer et al (2006), the CFC-12 apparent age can be regarded as the recommended age due to less potential for contamination during sampling, lower solubility in water, and less bias due to hydrodynamic dispersion than the other CFCs Busenberg et al, 1993). Apparent ages (CFC-12) of 10 groundwater samples ranged from 7 to 29 years using CFCs data ( Table 2).…”

Section: Groundwater Mean Residence Timesmentioning

confidence: 99%

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Han

Cao

McCallum

et al. 2015

Science of The Total Environment

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• Examine high nitrate contents in the coastal carbonate aquifer of northeast China • Estimate renewal rates and mean residence times of groundwater in coastal aquifers • Evaluate the relation between groundwater age distribution and nitrate transport • Propose potential pollution patterns of nitrate distribution in the coastal aquifer • Identify anthropogenic input mainly responsible for increasing groundwater salinity a b s t r a c t a r t i c l e i n f o H and CFCs methods were applied to provide a better understanding of the relationship between the distribution of groundwater mean residence time (MRT) and nitrate transport, and to identify sources of nitrate concentrations in the complex coastal aquifer systems. There is a relatively narrow range of isotopic composition (ranging from − 8.5 to − 7.0‰) in most groundwater. Generally higher tritium contents observed in the wet season relative to the dry season may result from rapid groundwater circulation in response to the rainfall through the preferential flow paths. In the well field, the relatively increased nitrate concentrations of groundwater, accompanied by the higher tritium contents in the wet season, indicate the nitrate pollution can be attributed to domestic wastes. The binary exponential and piston-flow mixing model (BEP) yielded feasible age distributions based on the conceptual model. The good inverse relationship between groundwater MRTs (92-467 years) and the NO 3 − concentrations in the shallow Quaternary aquifers indicates that elevated nitrate concentrations are attributable to more recent recharge for shallow groundwater. However, there is no significant relationship between the MRTs (8-411 years) and the NO 3 − concentrations existing in the carbonate aquifer system, due to the complex hydrogeological conditions, groundwater age distributions and the range of contaminant source areas. Nitrate in the groundwater system without denitrification effects could accumulate and be transported for tens of years, through the complex carbonate aquifer matrix and the successive inputs of nitrogen from various sources.

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Section: Groundwater Mean Residence Timesmentioning

confidence: 99%

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Han

Cao

McCallum

et al. 2015

Science of The Total Environment

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“…Hence the combination of tracer techniques enables not only the dating of water masses (e.g., Busenberg et al 1993;Plummer 2000, Schlosser andWinckler 2002), but also· the study of the dynamics of the gas-water interaction in the unsaturated zone Brennwald et al 2001).…”

Section: Radioactive Noble Gas Isotopesmentioning

confidence: 99%

Noble Gases in Lakes and Ground Waters

Kipfer

Aeschbach–Hertig

Peeters

et al. 2002

Reviews in Mineralogy and Geochemistry

322

352

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“…Studies tracking contaminant plumes, ch]orofluorocarbon compounds and/or "bomb pulse" radionuclides have provided information regarding groundwater flow directions and velocities (Barraclough et al, 1982;Beasley et al, 1993;Busenberg et al, 1993), However, these relative] y recent anthropogenic tracers can be tracked for relatively short distances and do not reveal regional scale flow patterns. The natural groundwater chemistry reported in this study provides regional scale groundwater flow information and thus complements smaller scale studies using anthropogenic tracers.…”

Section: Hydrogeologic Setting and Methodsmentioning

confidence: 99%

“…Anthropogenic tracers such as tritium (e.g., Clark and Fritz, 1997) and chlorofluorocarbons (e.g., Busenberg et al, 1993) are effective for tracking groundwater flow when residence times are less than about 50 years, but additional tools are needed for systems containing older groundwater.…”

Section: Introductionmentioning

confidence: 99%

Investigation of groundwater flow paths through combined inversion of strontium isotope ratios and hydraulic head data. Final report

Thomas M. Johnson

1999

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Project Objective: The objective of the project is to provide fundamental knowledge and diagnostic tools needed to design new technologies that will allow ultrahigh speed web transfer from press rolls and dryer cylinders.Fundamental Questions: From a timdamental standpoint, we expect that roll surface performance depends on the composition of contaminants that deposit on those surfaces during use, as well as the materials and finishing techniques used in manufacturing these surfaces. We need to understand, the contamination process, the influence of contamination on work of adhesion, the roles of surface topology, film splitting, and process conditions on web transfer. 1.What is the status of the technical scope of work? Answers should be tailored to the tasks in the Statement of Work that are being performed. Task 1 -The techniques and procedures described under sub-tasks 1 and 2 were developed during the last quarter of FY 1998-99. These techniques were refined during the quarter covered by this progress reportls' quarter 1999-00. During the past two quarters four mills, comprising three different grades (coated, liner, and medium) were visited. Personnel ffom IPST collected dryer surface topology data using an epoxy replicate technique, measure dryer surface contamination density, and collected contamination samples. The contamination samples were subjected to chemical analysis at IPST. One of the most interesting tindings from this work is that all dryer cylinders have some form of contamination. While the samples collected provide a suitable database, one or more mills maybe visited in the coming quarter to widen the scope of the data base. This task will be completed by the end of the second quarter of this FY. Task 2 -During the last quarter, the shakedown process for the CTS began. There were several problems uncovered. The induction heater used to heat the roll, a requirement for dryer can simulation, had previously been returned to the manufacturer for reconditioning. Upon testing, it did not operate properly and had to be sent back to the manufacturer. It has since been returned, installed on the CTS, tested, and shown to operate properly. The contamination system was tested. It was found that lower than expected flow rates were needed to keep the felt wetted with the contamination solution. The flow loop is being modified to incorporate a higher resolution flow meter. Contamination studies will begin by March 1.The topology of the coupons, that will be used in both the contamination studies and the web adhesion studies, were compared to those obtained from the dryer cylinders examined as part of Task 1. There was a reasonable correlation between the two sets of data. Thus, the test coupons should provide a representative surface for the contamination work. The results were interpreted quantitative y through construction of numerical models that capture the many details of this hydrologic system and simultaneously consider hydraulic head and isotope ratio data. The model ing results reinforce the qual...

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Age dating ground water by use of chlorofluorocarbons (CCl{sub 3}F and CCl{sub 2}F{sub 2}), and distribution of chlorofluorocarbons in the unsaturated zone, Snake River Plain aquifer, Idaho National Engineering Laboratory, Idaho

Cited by 68 publications

References 42 publications

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Noble Gases in Lakes and Ground Waters

Investigation of groundwater flow paths through combined inversion of strontium isotope ratios and hydraulic head data. Final report

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