Download or read book Controls on Arsenic Mobility in Contaminated Wetland and Riverbed Streams written by Nicole Elise Keon and published by . This book was released on 2002 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Root plaque oxidation state maps showed that both As(ll) and As(V) were retained in the plaque, suggesting that the plaque sequesters even the more mobile As(lll) species. Mass balance analysis of As revealed that the plaque was a significant sink of aqueous As. We concluded that the As retained in the Wells G & H wetland is susceptible to redox changes (particularly reduction of Fe hydroxides onto which most As is adsorbed) and displacement by competitive anions. Iron plaque formation on T. latifolia roots was shown to affect As cycling within root zone contaminated sediments by providing a substrate onto which aqueous As can adsorb.
Download or read book Impacts of Sea Level Rise on Arsenic Mobility and Cycling in Contaminated Coastal Soils written by Joshua J. LeMonte and published by . This book was released on 2016 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impacts of sea level rise (SLR) on biogeochemical processes in contaminated soils and sediments along the world’s coastlines remains poorly understood. Elevated levels of the carcinogen arsenic (As), from both geogenic and anthropogenic sources, are found along many coasts, most notably in south and southeast Asia, but also in the US, particularly along the Mid-Atlantic coast. In this work, a combination of laboratory and field techniques were used to ascertain the potential impacts of impending SLR on As mobility and cycling, and the current state of As mobility in a contaminated coastal zone of Delaware, USA. Advanced biogeochemical microcosm reactors were used to simulate inundation with natural sea and river waters on two historically As-contaminated Delaware coastal soils – a wetland soil and ditch sediment – across a wide range of redox potentials while monitoring chemical variables that are known to impact As mobility. Direct As speciation of the soils after reaction at different Eh values was obtained by bulk X-ray absorption near-edge structure (XANES) spectroscopy, X-ray fluorescence (XRF) imaging, and XANES spectroscopy. Reducing conditions led to As release and partial reduction of solid-phase As for both inundation scenarios and both soils. Sulfur speciation was also determined via XANES spectroscopy and showed evidence of sulfate reduction. Prolonged reducing conditions induced by SLR will drive the release of As from historically contaminated soils, but As release may be tempered when inundated by seawater as compared to river water for some soils (e.g. ditch sediment), possibly due to reduced microbial growth in high salinity conditions or preferential sulfate reduction limiting reductive dissolution of As-bearing Fe oxides. However, other soils (e.g. wetland) may see ionic exchange driving pH shifts as a prominent factor driving As release in addition to Eh levels. To assess the contaminant mobility at one of these former industrial sites along the Christina River, we conducted quantitative comparisons of hydrologic and biogeochemical dynamics across time scales ranging from hours to months, and throughout seasonal environmental variations. The use of synchrotron-based X-ray absorption spectroscopy as a geoforensic tool suggests that As from a neighboring Superfund site is likely contributing to recent accumulation of As at the site studied. Data were collected from pressure transducers in wells, multi-level redox sensors, and porewater samplers. Results indicate that groundwater surface interaction induced a tidally controlled redox gradient. In the tidally impacted variably saturated zone, redox potential varied between oxidizing and reducing conditions depending on the water table elevation. This strong correlation indicates that a rising water table may increase contaminant mobility. Porewater samples also confirm increasing arsenic (As) concentration during the rising tide.
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 Description of Input and Examples for Phreeqc Version 3 written by David L. Parkhurst and published by Createspace Independent Publishing Platform. This book was released on 2014-07-17 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: PHREEQC version 3 is a computer program written in the C and C++ programming languages that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC implements several types of aqueous models: two ion-association aqueous models (the Lawrence Livermore National Laboratory model and WATEQ4F), a Pitzer specific-ion-interaction aqueous model, and the SIT (Specific ion Interaction Theory) aqueous model. Using any of these aqueous models, PHREEQC has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations with reversible and irreversible reactions, which include aqueous, mineral, gas, solid-solution, surface-complexation, and ion-exchange equilibria, and specified mole transfers of reactants, kinetically controlled reactions, mixing of solutions, and pressure and temperature changes; and (3) inverse modeling, which finds sets of mineral and gas mole transfers that account for differences in composition between waters within specified compositional uncertainty limits.
Download or read book Water Quality for Ecosystem and Human Health written by Geneviève M. Carr and published by UNEP/Earthprint. This book was released on 2008 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is intended to provide an overview of the major components of surface and ground water quality and how these relate to ecosystem and human health. Local, regional and global assessments of water quality monitoring data are used to illustrate key features of aquatic environments, and to demonstrate how human activities on the landscape can influence water quality in both positive and negative ways. Clear and concise background knowledge on water quality can serve to support other water assessments.
Download or read book Reservoir Sedimentation written by Anton J. Schleiss and published by CRC Press. This book was released on 2014-08-12 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the mechanisms of reservoir sedimentation being well known for a long time, sustainable and preventive measures are rarely taken into consideration in the design of new reservoirs. To avoid operational problems of powerhouses, sedimentation is often treated for existing reservoirs with measures which are efficient only for a limited time.Th
Download or read book Riparian Management in Forests of the Continental Eastern United States written by Ellen S. Verry and published by CRC Press. This book was released on 1999-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The timing could not be better for addressing riparian area management and the resulting impacts of surface water. The Forest Service leadership team has identified water and watershed management as the issue of the upcoming decade. These factors and more have moved riparian forests to the forefront of environmental management. Riparian Management in Forests of the Continental Eastern United States gives you the tools you need to take on this task. Each day, thousands of natural resource professionals face the problems involved in managing riparian forests. The challenge: fragmented ownership, fragmented ecosystems, and diverse interest groups. The solution requires a multidisciplinary approach, drawing on a complex mix of government agencies, private interests, and local communities as exemplified in the following initiatives: Chesapeake Bay Program "Save the Bay" Inland West Water Strategy New York City Watershed Project The Pacific Habitat Strategy The Anadromous Fish Habitat Riparian Management in Forests of the Continental Eastern United States summarizes the state-of-the-art in the management of forested riparian areas. It serves as a desktop reference for natural resource administrators, educators, and on-the-ground managers from industry, consulting firms, and municipal, state, and federal agencies who routinely face the complex problems of protecting riparian areas. Features
Download or read book Water Quality Assessments written by Deborah V Chapman and published by CRC Press. This book was released on 1996-08-22 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guidebook, now thoroughly updated and revised in its second edition, gives comprehensive advice on the designing and setting up of monitoring programmes for the purpose of providing valid data for water quality assessments in all types of freshwater bodies. It is clearly and concisely written in order to provide the essential information for all agencies and individuals responsible for the water quality.
Download or read book Arsenic in Ground Water written by Alan H. Welch and published by Springer Science & Business Media. This book was released on 2003 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consolidates much of what is known about the geochemistry of arsenic and provides new information on relationships between high concentrations of arsenic in ground water and geochemical environments. The subject matter of this book ranges in scope from molecular-scale geochemical processes that affect the mobility of arsenic in ground water, to arsenic contaminated ground water at the national scale. Chapters were contributed by an international group of research scientists from a broad range of backgrounds.
Download or read book Fundamentals of Urban Runoff Management written by Earl Shaver and published by . This book was released on 2007 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arsenic Pollution written by Peter Ravenscroft and published by John Wiley & Sons. This book was released on 2009-03-09 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic Pollution summarizes the most current research on the distribution and causes of arsenic pollution, its impact on health and agriculture, and solutions by way of water supply, treatment, and water resource management. Provides the first global and interdisciplinary account of arsenic pollution occurrences Integrates geochemistry, hydrology, agriculture, and water supply and treatment for the first time Options are highlighted for developing alternative water sources and methods for arsenic testing and removal Appeals to specialists in one discipline seeking an overview of the work being done in other disciplines
Download or read book River Mechanics written by Pierre Y. Julien and published by Cambridge University Press. This book was released on 2018-04-12 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completely updated and with three new chapters, this analysis of river dynamics is invaluable for advanced students, researchers and practitioners.
Download or read book Heavy Metals written by Wim Salomons and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Heavy Metals: Problems and Solutions" is divided into three sections dealing with basic geochemical processes, remediation and case studies. The basic geochemical processes are discussed with respect to mobility in the environment and impact as well as methods to derive guidelines for heavy metals. Remediation focuses on currently available methods to treat contaminated sediments and soils. In addition, it considers the concept of geochemical engineering for remediation of large areas contaminated by metals. A number of case studies of polluted sediments and soils and their environmental impact highlight the principles discussed in the first two sections.
Download or read book River restoration a strategic approach to planning and management written by Speed, Robert and published by UNESCO Publishing. This book was released on 2016-09-19 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Metal Mining Contaminated River Sediments in England and Wales written by Karen A. Hudson-Edwards and published by . This book was released on 2008 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a review of how sediments have been polluted by abandoned metal mines. Recommened actions are also discussed.
Download or read book Diffusive Gradients in Thin Films for Environmental Measurements written by William Davison and published by Cambridge University Press. This book was released on 2016-09-15 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential guide to the applications and usage of the diffusive gradients in thin-films (DGT) technique for students and professionals.
Download or read book Managing aquifer recharge written by UNESCO and published by UNESCO Publishing. This book was released on 2021-11-25 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
