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Dissolved Organic Carbon 14c In Southern Nevada Groundwater And Implications For Groundwater Travel Times
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Book Synopsis Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times by : Ronald L. Hershey
Download or read book Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times written by Ronald L. Hershey and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times by :
Download or read book Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times written by and published by . This book was released on 2016 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved inorganic carbon (DIC) carbon-14 (14C) ages must be corrected for complex chemical and physical reactions and processes that change the amount of 14C in groundwater as it flows from recharge to downgradient areas. Because of these reactions, DIC 14C can produce unrealistically old ages and long groundwater travel times that may, or may not, agree with travel times estimated by other methods. Dissolved organic carbon (DOC) 14C ages are often younger than DIC 14C ages because there are few chemical reactions or physical processes that change the amount of DOC 14C in groundwater. However, there are several issues that create uncertainty in DOC 14C groundwater ages including limited knowledge of the initial (A0) DOC 14C in groundwater recharge and potential changes in DOC composition as water moves through an aquifer. This study examines these issues by quantifying A0 DOC 14C in recharge areas of southern Nevada groundwater flow systems and by evaluating changes in DOC composition as water flows from recharge areas to downgradient areas. The effect of these processes on DOC 14C groundwater ages is evaluated and DOC and DIC 14C ages are then compared along several southern Nevada groundwater flow paths. Twenty-seven groundwater samples were collected from springs and wells in southern Nevada in upgradient, midgradient, and downgradient locations. DOC 14C for upgradient samples ranged from 96 to 120 percent modern carbon (pmc) with an average of 106 pmc, verifying modern DOC 14C ages in recharge areas, which decreases uncertainty in DOC 14C A0 values, groundwater ages, and travel times. The HPLC spectra of groundwater along a flow path in the Spring Mountains show the same general pattern indicating that the DOC compound composition does not change along this flow path. Although DOC concentration decreases from recharge-area to downgradient groundwater, the organic compounds are similar, indicating that DOC 14C is unaffected by other processes such as microbial degradation. A small amount of organic carbon was leached from crushed volcanic and carbonate aquifer outcrop rock in rock-leaching experiments. The leached DOC was high in 14C (75 pmc carbonate rocks, 91 pmc volcanic) suggesting that the leached DOC likely came from microbes in the rock samples. The small amount of DOC and high 14C indicates that the amount of old organic carbon in these rocks is low so there should be minimal impact on groundwater DOC 14C ages. Based on the results from this study, DOC 14C ages do not require additional corrections. Several correction models were applied to DIC 14C ages to correct for water-rock reactions along two carbonate and two volcanic flow paths and the corresponding travel times were compare to DOC 14C travel times. The DOC 14C travel times were hundreds to thousands of years shorter than uncorrected and corrected DIC 14C travel times except for the upper section of one carbonate flow path. DOC 14C travel times ranged from 400 to 5,400 years as compared to DIC 14C that ranged from modern to 20,900 years. The DIC 14C ages are greatly influenced by carbonate mineral and gas reactions and other processes such as matrix diffusion, isotope exchange, or adsorption, which are not always adequately accounted for in DIC 14C groundwater age correction models.
Book Synopsis Dating Groundwater Using Dissolved Organic Carbon and Estimating Flow Path Travel Times in Southern Nevada Aquifers by : Wyatt Fereday
Download or read book Dating Groundwater Using Dissolved Organic Carbon and Estimating Flow Path Travel Times in Southern Nevada Aquifers written by Wyatt Fereday and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study's objective was to evaluate the use of dissolved organic carbon (DOC) carbon-14 (14C) to estimate groundwater ages in southern Nevada aquifers. Hydrogeologists have traditionally used dissolved inorganic carbon (DIC) 14C to estimate groundwater ages. However, because multiple processes change DIC 14C activities in groundwater, complex corrections are often required, and the ages generated can be frustratingly inexact. The hypothesis was that DOC 14C dating is more accurate because DOC is less reactive with aquifer rocks. Water samples were analyzed for 14C by accelerator mass spectrometry. Laboratory experiments indicated that there is no significant dilution of groundwater DOC 14C by leaching of 'dead' (no 14C) organic carbon from aquifer rocks. Similar DOC compounds were identified in both up- and down-gradient waters meaning that alterations from kerogen or bacteria likely have minimal effects on DOC 14C activities. Loss of DOC 14C through matrix diffusion is minimal because calculated diffusion coefficients were relatively small for DOC 14C compared to a conservative bromide tracer. Dissolved organic carbon 14C activity, expressed in percent modern carbon (pmc), for 14 recharge area locations ranged from 96.0 to 120.1 pmc, with an average of 105.8 pmc, yielding a recent (post-atmospheric nuclear weapons testing) age. Dissolved organic carbon 14C activity for eight down-gradient locations ranged from 45.8 to 75.2 pmc with an average of 62.3 pmc, or about 3,900 years. Flow-path travel times are thousands of years less for DOC than for both corrected and uncorrected DIC. This discrepancy likely is the result of water-rock reactions and other physical processes such as matrix diffusion that lower DIC 14C activities in groundwater. Results from this study demonstrate that the DOC 14C dating technique can be used to estimate groundwater ages in aquifers with low DOC and provides an alternative to the traditional DIC 14C dating.
Book Synopsis Hydrogeologic Studies and Groundwater Monitoring in Snake Valley and Adjacent Hydrographic Areas, West-central Utah and East-central Nevada: report (304 pages), 4 Plates, Appendices and data tables by : Hugh A. Hurlow
Download or read book Hydrogeologic Studies and Groundwater Monitoring in Snake Valley and Adjacent Hydrographic Areas, West-central Utah and East-central Nevada: report (304 pages), 4 Plates, Appendices and data tables written by Hugh A. Hurlow and published by Utah Geological Survey. This book was released on 2015-02-01 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report (269 pages, 4 plates) presents hydrogeologic, groundwater-monitoring, and hydrochemical studies by the Utah Geological Survey (UGS) in Snake Valley, Tule Valley, and Fish Springs Flat in Millard and Juab Counties, west-central Utah. Data From the newly established UGS groundwater-monitoring network establish current baseline conditions, and will help quantify the effects of future variations in climate and groundwater pumping. New hydrochemical data show that groundwater quality is generally good, major-solute chemistry varies systematically from recharge to discharge areas, and suggest that most groundwater was recharged over one thousand years ago, implying low recharge rates and/or long or slow flow paths. Two aquifer tests yield estimates of transmissivity and storativity for the carbonate-rock and basin-fill aquifers. Variations in the potentiometric surface, hydrogeology, and hydrochemistry are consistent with the hypothesis of regional groundwater flow from Snake Valley northeast to Tule Valley and Fish Springs. Collectively, our work delineates groundwater levels, flow, and chemistry in Snake Valley and adjacent basins to a much greater degree than previously possible, and emphasizes the sensitivity of the groundwater system to possible increases in groundwater pumping.
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissolved Organic Carbon in Groundwater and Streams by : P. M. Wallis
Download or read book Dissolved Organic Carbon in Groundwater and Streams written by P. M. Wallis and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environment Abstracts Annual 1989 by : Bowker Editorial Staff
Download or read book Environment Abstracts Annual 1989 written by Bowker Editorial Staff and published by R. R. Bowker. This book was released on 1990 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific Investigations Report by : Sharon E. Kroening
Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Use of Dissolved Organic Carbon (DOC) as an Indicator of Ground Water Contamination by : David M. Bjerklie
Download or read book The Use of Dissolved Organic Carbon (DOC) as an Indicator of Ground Water Contamination written by David M. Bjerklie and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Tracers by : Trevor Elliot
Download or read book Environmental Tracers written by Trevor Elliot and published by MDPI. This book was released on 2018-10-08 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Environmental Tracers" that was published in Water
Download or read book Fact Sheet written by and published by . This book was released on 1998 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tracing and Dating Young Ground Water by :
Download or read book Tracing and Dating Young Ground Water written by and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotope Methods for Dating Old Groundwater by : International Atomic Energy Agency
Download or read book Isotope Methods for Dating Old Groundwater written by International Atomic Energy Agency and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guidebook provides theoretical and practical information for using a variety of isotope tracers for dating old groundwater, i.e. water stored in geological formations for periods ranging from about 1000 to one million years. Theoretical underpinnings of the methods and guidelines for their use in different hydrogeological environments are described. The guidebook also presents a number of case studies providing insight into how various isotopes have been used in aquifers around the world. The methods, findings and conclusions presented in this publication will enable students and practicing groundwater scientists to evaluate the use of isotope dating tools for specific issues related to the assessment and management of groundwater resources. In addition, the guidebook will be of use to the scientific community interested in issues related to radioactive waste disposal in geological repositories.
Book Synopsis Publications of the Geological Survey by : Geological Survey (U.S.)
Download or read book Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1986 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geochemical Processes by : Horst D. Schulz
Download or read book Geochemical Processes written by Horst D. Schulz and published by Wiley-VCH. This book was released on 2002-12-25 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a result of the Priority Programme 546 run by the Deutsche Forschungsgemeinschaft. It presents the various ideas, concepts and conclusions that resulted from this Programme on the subject of geochemical processes with long-term effects in anthropogenically influenced drainage and ground water.
Book Synopsis Monitored Natural Attenuation of Inorganic Contaminants in Ground Water by :
Download or read book Monitored Natural Attenuation of Inorganic Contaminants in Ground Water written by and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.3 ... consists of individual chapters that describe 1) the conceptual background for radionuclides, including tritium, radon, strontium, technetium, uranium, iodine, radium, thorium, cesium, plutonium-americium and 2) data requirements to be met during site characterization.
