Results 161 to 170 of about 5,730,086 (191)

Novel Insights into Dissolved Organic Matter Processing Pathways in a Coastal Confined Aquifer System with the Highest Known Concentration of Geogenic Ammonium

Environmental Science & Technology, 2021
High levels of geogenic ammonium in groundwater is a highly neglected nitrogen pool in coastal aquatic systems. Although organic matter (OM) mineralization is known to significantly influence geogenic ammonium enrichment, the detailed mechanism underlying ammonium enrichment based on dissolved organic matter (DOM) characterization in coastal aquifer ...
Yao Du, Yamin Deng, Zhaohui Liu, Yanwen Huang, Xinwen Zhao, Qinghua Li, Teng Ma, Yanxin Wang   +7 more
openaire   +2 more sources

Assessment of hydrogeochemical processes and geogenic mercury pollution in coastal karstic aquifers in semi-arid environments

2020
<p>Water resources management in coastal where the freshwater availability is limited has often led to rising concerns about the capability of local resources to cover the increased water needs. This condition is especially amplified in areas whereextra stress is added to the water sources from overexploitation and/or quality ...
Christos Pouliaris, Alexandra Spyropoulou, Ioannis Sarris, Chrysi Laspidou, Andreas Kallioras   +4 more
openaire   +1 more source

Arsenic fate in the Brahmaputra river basin aquifers: Controls of geogenic processes, provenance and water-rock interactions

Applied Geochemistry, 2019
Abstract The influence of aquifer sediments provenance and geochemical processes on groundwater solute chemistry, including the fate of groundwater arsenic (As) in aquifers for three distinct tectono-morphic zones (north-western, northern, and southern [NW, N, and S] in the basin of Himalayan Mega Rivers, i.e., Brahmaputra river basin (BRB), and ...
Swati Verma, Abhijit Mukherjee, Chandan Mahanta, Runti Choudhury, Rakesh P. Badoni, Gopal Joshi   +5 more
openaire   +1 more source

Geogenic sources and sinks of trace metals in the Larsemann Hills, East Antarctica: Natural processes and human impact

Applied Geochemistry, 2006
To evaluate the extent of human impact on a pristine Antarctic environment, natural baseline levels of trace metals have been established in the basement rocks of the Larsemann Hills, East Antarctica. From a mineralogical and geochemical point of view the Larsemann Hills basement is relatively homogeneous, and contains high levels of Pb, Th and U ...
Gasparon, Massimo, Matschullat, Jorg
openaire   +4 more sources

The Coarse Volcanic Rock Industry at the Río Ibáñez 6 West Site, Chilean Patagonia: Assessing Geogenic Versus Anthropogenic Processes

Lithic Technology, 2016
Prentiss et al. (2015, The Coarse Volcanic Rock Industry at Rio Ibanez 6 west, Aisen Region, Patagonian Chile. Lithic Technology 40:112–127) described a unique assemblage of bifacial and unifacial tools made from coarse volcanic rock at the Rio Ibanez 6 west site in Chilean Patagonia.
Prentiss, Anne Marie, Barnett, Kristen D., Walsh, Matthew   +2 more
openaire   +1 more source

Hydrogeochemical modeling strategies and geophysical–geological integration to identify geogenic and anthropogenic processes in a metamorphic basement aquifer

Science of The Total Environment
A comprehensive hydrogeological-hydrogeochemical model of an aquifer situated on a metamorphic basement and overlain by a vulnerable alluvial fill was developed using a novel methodology that integrates geological-geophysical interpretation, hydrogeochemical analysis, inverse modeling, and mixing models.
Berenice, Gómez-Mena, Janete, Morán-Ramírez, José Alfredo, Ramos-Leal, David Ernesto Torres, Gaytán, Briseida, López-Álvarez, Isaac, Bonola-Alonso, Manuel, Martínez-Morales   +6 more
openaire   +2 more sources

Volatile organic compounds (VOCs) in soil gases from Solfatara crater (Campi Flegrei, southern Italy): Geogenic source(s) vs. biogeochemical processes

Applied Geochemistry, 2015
The chemical composition of volatile organic compounds (VOCs) in soil gases from the Solfatara crater (Campi Flegrei, Italy) was analyzed to investigate the effects of biogeochemical processes on gases discharged from the hydrothermal reservoir and released into the atmosphere through diffuse degassing.
Tassi F. [1, 2] Venturi S.[1], Cabassi J.[1], Capecchiacci F.[1, 2], Nisi B.[3], Vaselli O. [1, 2]   +7 more
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Geogenic fluoride enrichment in groundwater of a volcanic terrain: hydrogeochemical processes, exposure pathways, and human health risk assessment

Environmental Geochemistry and Health
Elevated fluoride in groundwater is increasingly recognized as a major geogenic and public health concern in volcanic terrains. In the Taftan volcanic region of southeastern Iran, fluoride concentrations ranged from 0.04 to 1.77 mg/L, with 43% of samples exceeding the WHO drinking-water guideline value (1.5 mg/L) and approximately 57% exceeding the ...
Reza Jahanshahi, Hafizeh Rigi Karvandari, Sepideh Mali   +2 more
openaire   +2 more sources

Unravelling the role of sediment disposition influenced redox-dominated geochemical processes in distribution of geogenic contaminants in groundwater of a major fluvial aquifer: Implications for safe drinking water sources

Journal of Contaminant Hydrology
Groundwater-sourced drinking water in large sedimentary basins across the world are highly vulnerable to geogenic contamination. The Brahmaputra River Basin (BRB) in the northeastern part of India is found to have widespread groundwater contamination from redox-sensitive elements, arsenic (As) and nickel (Ni), besides having elevated levels of iron (Fe)
David Anand Aind, Swati Verma, Tirumalesh Keesari, Bijoy Krishna Chetia, Ankuran Dewgharia, Abhijit Mukherjee   +5 more
openaire   +2 more sources

Biogeochemical Processes in Soils Affecting Volatile Organic Compounds (Vocs) from Geogenic Sources and Municipal Waste Landfills: A Comprehensive Study

2023
Antonio Randazzo, Stefania Venturi, Franco Tassi   +2 more
openaire   +1 more source