Download or read book Geochemical Factors Controlling Radium in the Cambrian Ordovician Aquifer System of Southeastern Wisconsin written by Michael Cape and published by . This book was released on 2003 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Impacts on Radium Mobility in the Midwestern Cambrian Ordovician Aquifer System written by Madeleine Mathews and published by . This book was released on 2021 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Midwestern Cambrian-Ordovician aquifer system (MCOAS) covers a large portion of the Midwestern United States and is a major source for public and domestic water supply. Radium (Ra) is a contaminant frequently exceeding the EPA maximum contaminant level of 185 mBq/L (5 pCi/L) for combined [226]Ra and [228]Ra in the MCOAS. While elevated Ra is associated with low dissolved oxygen, old water, and elevated total dissolved solids in groundwater at the aquifer scale, it is difficult to predict elevated Ra occurrence at individual wells. This dissertation uses field and laboratory methods to examine the geochemical influences on Ra mobility within the MCOAS, to gain insight into the influence of local hydrogeology on Ra partitioning to the groundwater. Multiple factors impact Ra sources and mobility in the MCOAS at the local scale; at discrete intervals within the aquifer system, elevated total dissolved solids are related to elevated Ra in an unconfined aquifer, while low dissolved oxygen is related to elevated Ra in a confined aquifer. Local geochemical conditions control Ra sorption to rock, as determined by whole-rock parent-daughter isotope ratios and sequential extractions on representative MCOAS bedrock samples. Potential hydrologic flow from Ra-rich stratigraphy to stratigraphy with lower sorptive capacity may result in increased Ra mobility within the MCOAS. The coupling of field and laboratory work compared the contribution of Ra from aquifer solids across specific stratigraphy. Isotopic evidence ([226]Ra/[238]U) demonstrates radionuclide mobility, where geochemical influences (e.g., ORP, alkalinity) likely influence U partitioning within the system. Additionally, Ra concentrations during a short-term pumping test are shown to be consistent with trends on 1-year timeframe, although the analytical method for Ra is important to verify trend precision. The larger implications of this project are that the presence of parent nuclides, as well as local geochemical and hydrologic conditions are important to consider in terms of predicting where elevated Ra will occur in groundwater samples. This approach provides new insight into how water-rock interactions within specific stratigraphy contribute Ra to the aqueous system within the MCOAS.
Download or read book Hydrogeochemical Changes Impacting Radium Activity in the Midwestern Cambrian Ordovician Aquifer System written by Amy K. Wiersma and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Midwestern Cambrian-Ordovician aquifer system (MCOAS) is a valuable source of drinking water in the North Central United States, but can contain elevated levels of naturally occurring radium (Ra). Long-term consumption of Ra in drinking water is linked to an increased risk of bone cancer, and is therefore federally regulated in the U.S. at 185 millibecquerels per liter (mBq/L) or 5 picocuries per liter (pCi/L) for the total of 226Ra and 228Ra. While the hydrogeochemical conditions associated with elevated activity Ra in the MCOAS are well documented, less is known about how Ra occurrence is affected due to hydrogeochemical changes initiated by natural and anthropogenic aspects. This dissertation uses field and modeling studies to explore Ra occurrence when hydrogeochemical change is instigated by factors including natural hydrogeologic conditions, release of organic contaminants to the subsurface, and well field management. Radium activity increases as groundwater evolves along a regional flow path and approaches the boundary of the Maquoketa shale, a regional confining unit; here, the aquifer becomes locally confined and groundwater is older with geochemical conditions conducive to Ra mobility, including low dissolved oxygen and elevated total dissolved solids (TDS). A complex organic chemical mixture released to the subsurface alters aquifer pH, redox, and TDS conditions, resulting in elevated Ra activity within the dissolved phase plume that highlights the importance of characterizing Ra at hydrocarbon-contaminated sites. As demonstrated by groundwater flow modeling, well construction and pumping rates can alter hydraulic gradients that enhance groundwater exchange between units of different geochemistry and modify the contribution of groundwater from stratigraphic units with different Ra activity to wells. Overall, this dissertation provides insight into how environmental and anthropogenic factors influence hydrogeochemical conditions and Ra occurrence in groundwater, and can help guide long-term groundwater management strategies for mitigating Ra activity in groundwater pumped from the MCOAS.
Download or read book Groundwater Geochemistry and Radionuclide Activity in the Cambrian Ordovician Sandstone Aquifer of Dodge and Fond Du Lac Counties Wisconsin written by Tamie R. Weaver and published by . This book was released on 1988 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geochemistry of Radioactive Ground Water Within the Cambrian ordovician Aquifer System of Central Missouri written by Patricia Leigh Settles and published by . This book was released on 1989 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Radium in Wisconsin Groundwater and Removal Methods for Community Water Systems written by Norman A. Hahn and published by . This book was released on 1984 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Groundwater Quality written by Harriet Nash and published by Springer. This book was released on 1994-10-31 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality monitoring and testing is of paramount importance both in the developed and developing world. This book presents a series of papers illustrating the varied nature of current research into groundwater quality. Urban and rural supplies are covered through a case history approach, and the importance of remedial action to prevent deterioration is emphasized.
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.
Download or read book Geochemical Hydrologic and Geologic Factors Affecting Radon 222 and Radium 226 Concentrations in Ground Waters at Deerfield New Hampshire written by Cynthia Diane Campisano and published by . This book was released on 1987 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study and Interpretation of the Chemical Characteristics of Natural Water 2nd Ed written by Geological Survey (U.S.) and published by . This book was released on 1961 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radium in Ground Water written by Bernice Anne Aument and published by . This book was released on 1989 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tracerlpm Version 1 written by Bryant C. Jurgens and published by CreateSpace. This book was released on 2014-06-16 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: TracerLPM is an interactive Excel(r) (2007 or later) workbook program for evaluating groundwater age distributions from environmental tracer data by using lumped parameter models (LPMs). Lumped parameter models are hydrodynamic dispersion or mixing within the aquifer, well bore, or discharge area. Five primary LPMs are included in exponential model (PEM), and dispersion model (DM). Binary mixing models (BMM) can be created by combining primary LPMs in various combinations. Travel time through the unsaturated zone can be included as an additional parameter. TracerLPM also allows users to enter age distributions determined from other methods, such as particle tracking LPMs not included in this program. Tracers of both young groundwater (anthropogenic atmospheric gases and isotopic substances indicating post-1940s recharge) and much older groundwater (carbon-14 and helium-4) can be interpreted simultaneously so that estimates of the groundwater age distribution for samples with a wide range of ages can be constrained.
Download or read book Environmental Isotopes in Hydrogeology written by Ian D. Clark and published by CRC Press. This book was released on 2013-11-20 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is an increasingly important resource to human populations around the world, and the study and protection of groundwater is an essential part of hydrogeology - the subset of hydrology that concentrates on the subsurface. Environmental isotopes, naturally occurring nuclides in water and solutes, have become fundamental tools for tracing
Download or read book Subsurface Hydrology written by George F. Pinder and published by John Wiley & Sons. This book was released on 2006-09-29 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an emphasis on methodology, this reference provides a comprehensive examination of water movement as well as the movement of various pollutants in the earth's subsurface. The multidisciplinary approach integrates earth science, fluid mechanics, mathematics, statistics, and chemistry. Ideal for both professionals and students, this is a practical guide to the practices, procedures, and rules for dealing with groundwater.
Download or read book Radium and Radon in Ground Water in the Chickies Quartzite Southeastern Pennsylvania written by Lisa A. Senior and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth Materials written by Kevin Hefferan and published by John Wiley & Sons. This book was released on 2010-11-09 with total page 935 pages. Available in PDF, EPUB and Kindle. Book excerpt: Minerals and rocks form the foundation of geologic studies. This new textbook has been written to address the needs of students at the increasing number of universities that have compressed separate mineralogy and petrology courses into a one- or two-semester Earth materials course. Key features of this book include: equal coverage of mineralogy, sedimentary petrology, igneous petrology and metamorphic petrology; copious field examples and regional relationships with graphics that illustrate the concepts discussed; numerous case studies to show the uses of earth materials as resources and their fundamental role in our lives and the global economy, and their relation to natural and human-induced hazards; the integration of earth materials into a cohesive process-based earth systems framework; two color thoughout with 48 pages of four color. Readership: students taking an earth materials, or combined mineralogy and petrology course in an earth science degree program. It will also be useful for environmental scientists, engineering geologists, and physical geographers who need to learn about minerals, rocks, soil and water in a comprehensive framework. A companion website for this book is available at: www.wiley.com/go/hefferan/earthmaterials.
