geochemical Articles
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The stability of the relative content ratios of Cu, Pb and Zn in soils and sediments
The study indicates that the relative content ratios of Cu, Pb and Zn in soils and sediments tend to have stability compared to those in meteorites, rocks and organisms. This stability is considered to be associated with their geochemical properties and has no relationship to the existing environments if it is not disturbed by an anthropogenic factor. In addition, it can serve as a background ...
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Full-scale application of nZVI: innovative geochemical barrier supported by direct current
Massive contamination by chlorinated ethenes (CHCs) under an engineering plant showed to be problem for a near groundwater receiving river. The innovative approach including formation of nZVI reactive geochemical barrier was chosen by the remediation company MEGA. Moreover, a prolongation of activity of the applied NANOFER was achieved thanks to the usage of DC. Long-term monitoring and ...
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Svratka Site: Innovative NZVI Geochemical Barrier Supported by Direct Current (DC)
Massive contamination by chlorinated ethenes (CHCs) under an engineering plant showed to be problem for a near groundwater receiving river. The innovative approach including formation of nZVI reactive geochemical barrier was chosen by the remediation company MEGA. Moreover, a prolongation of activity of the applied NANOFER was achieved thanks to the usage of DC. Long-term monitoring and ...
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A Calibrated Predictive Geochemical Model of Leaching and Attenuation Reactions in a Mine Pit Lake
Abstract: A geochemical model was developed to predict future water quality of the Cove pit lake in support of site closure and regulatory permitting. The terminal, groundwater-fed Cove pit lake began filling in 2001, and water-quality samples from the 15-year filling period were used to calibrate the pit-lake model and evaluate the accuracy of the predictions. Inputs to the pit-lake model ...
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Case Study - Hydrogeologic Investigation - Reno Creek, Nevada, USA
AUC LLC's application for a new In Situ Recovery Site before the U.S. Nuclear Regulatory Commission required a comprehensive understanding of site hydrogeology. AUC LLC utilized EnviroInsite's sophisticated contouring tools to map water levels and then mapped the geochemical variability by application of EnviroInsite's stiff and piper ...
By EI LLC
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Integrated assessment: rhetoric of models and perceptions of world futures
Integrated assessment of climate change implies the construction of models describing the very complex interactions among economic processes, geochemical or geophysical phenomena and ecological processes at the Earth level. This attempt is unprecedented in the history of science. To build models of a unique, very large and extremely complex object, the whole Earth, supposes the definition of ...
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Geochemical control processes and potential sediment toxicity in a mine‐impacted lake
Geochemical parameters and major ion concentrations from sediments of a freshwater lake in the town of Åtvidaberg, south‐eastern, Sweden, were used to identify the geochemical processes that control the water chemistry. The lake sediments are anoxic, characterized by reduced sulphur and sulphidic minerals. The hypothesis tested is that in sulphidic‐anaerobic contaminated sediments, the ...
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Heavy metals and clay minerals in surface sediments from the Mazatlan Bay, Mexican subtropical Pacific coast
To know the geochemical behaviour of Al, Cd, Cr, Cu, Fe, Li, Mn, Ni and Zn, their sources, distribution patterns and association with sedimentological factors (organic carbon and carbonate contents, grain size and clay mineralogy of the sediments), 29 surface sediment samples were collected from the Mazatlan Bay, Mexico. In addition to the determination of the concentration of these variables by ...
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Shallow groundwater surrounding the Likeng landfill, Guangzhou, China – major ions and elements indicating the contamination sources
An investigation of groundwater contamination around the Likeng landfill, Guangzhou, was carried out. Major ions and elements of 34 groundwater samples were measured, and the Piper trilinear diagram and expanded Durov diagram were used to analyze the chemical types and hydro-geochemical processes of the groundwater. End Member Mixing Analysis was used to find the types and sources of ...
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Hydro-geochemical characteristics of groundwater of Sirhind Nala sub-basin (Ghaggar river basin, India) in relation to salinity hazard
Hydro-geochemical investigation of groundwater of Sirhind Nala sub-basin of the Ghaggar river basin (Southwest Punjab) has been carried out to study the distribution and sources of various dissolved ions. The levels of EC indicated that high salinity of groundwater was confined to small patches. The variations in EC levels seem to be related to non-flushing of water entrapped by clay beds, ...
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Determination of anthropogenic pedo-geochemical backgrounds (FPGAs): the case of Toulouse Métropole - Case Study
Urban soils hold the "memory" of cities; the geochemical quality of urban soils, to which the population is exposed, reflects its history: emissions since the industrial revolution, successive reconstructions on rubble, particularly following historical conflicts, etc. This is why we know little about the quality of these surface layers, made up of rubble of uncertain composition, even though it ...
By BRGM
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Hydro–geochemical behaviour of two coastal aquifers under severe climatic and human constraints: comparative study between Essaouira basin in Morocco and Jeffara basin in Tunisia
Since surface waters are mostly irregular and rare, groundwater in arid and semi–arid regions are submitted to high human constraints enhanced by severe climatic conditions. Multiple isotope analyses and chemical tracing of groundwater from the Essaouira basin (South–Western Morocco) and from the Jeffara basin (South–Eastern Tunisia) reveal that salinisation processes are mainly related to ...
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Spatial and temporal variations in the transport and storage of trace metal contaminants in the upper Rio Pilcomayo, southern Bolivia
Mining of the Cerro Rico de Potosi precious metal-polymetallic tin deposits of Bolivia began in 1545 and has led to severe contamination of water and sediments of the upper Rio Pilcomayo drainage system. Detailed geomorphological, stratigraphic and geochemical analyses show that the downstream transport and deposition of sediment-borne trace metals from Cerro Rico vary among three types of river ...
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Effects of two different water sources used for irrigation on the soil geochemical properties and the quality of the Lohan guava (Psidium guajava L. Lohan)
The effect of two different water sources (treated waste water and lake water) used for irrigation on the soil geochemical properties and the fruit quality parameters of the Lohan guava were studied. The fruits' physical attributes, physicochemical attributes, nutritional attributes, mineral content as well as consumers’ acceptance were evaluated. The properties of the different water sources ...
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Bioerosion by chemosynthetic biological communities on Holocene submarine slide scars
Geomorphic, stratigraphic, and faunal observations of submarine slide scars that occur along the flanks of Monterey Canyon in 2.0–2.5 km water depths were made to identify the processes that continue to alter the surface of a submarine landslide scar after the initial slope failure. Deep-sea chemosynthetic biological communities and small caves are common on the sediment-free surfaces of the ...
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Recharge areas and geochemical evolution of groundwater in an alluvial aquifer system in the Sultanate of Oman
A regional hydrogeochemical model was developed to evaluate the geochemical evolution of different groundwaters in an alluvial aquifer system in the Interior of Oman. In combination with environmental isotopes the model is able to extract qualitative and quantitative information about recharge, groundwater flow paths and hydraulic connections between different aquifers. The main source of water ...
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Fluoride contamination mapping of groundwater in Northern India integrated with geochemical indicators and GIS
There are many incidents of increasing fluoride concentrations observed in India's groundwater. In the present study, the fluoride content was chemically analysed and integrated with geochemical model WATEQ4F sampled from Allahabad district, Northern India, with other water quality parameters. Geospatial technique was employed to depict the spatial distribution of fluoride ...
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Assessment of raw materials for cement industry in Sohag area, upper Egypt
In the last few years, cement industry become a major player in materials recycling, although it is environmental polluted industry and a great consumer of limestone and clay. Cement manufacturing depends greatly upon chemical and physical characteristics of raw materials, its quality and quantity, simplicity of its extraction and its costs. Sohag Governorate is surrounded by the Eocene ...
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Field application of ChitoRem chitin complex as a slow release electron donor for dechlorination: Distler Brickyard Site, West Point, KY Case Study
Background Chloroethene source area (mainly TCE) is present in low permeability sediments. The objective is to clean up the source and prevent migration of contamination to underlying aquifer, which is a local drinking water source. The selected approach enhances the formation permeability while simultaneously providing an electron donor, chitin, for anaerobic reductive dechlorination (ARD). ...
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Arsenite sorption and oxidation by synthetic birnessite
Arsenite (As(III)) is a more toxic form of inorganic arsenic and its removal from drinking water is less effective compared with arsenate (As(V)). In the present study, synthetic birnessite (δ-MnO2) was used to investigate the oxidative transformation of arsenite into arsenate using batch experiments under different reaction conditions. Results showed that arsenite transformation ...
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