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4 produkter
4 produkter
Groundwater Geochemistry
A Practical Guide to Modeling of Natural and Contaminated Aquatic Systems
2008
1 249 kr
Skickas inom 7-10 vardagar
This second edition remains a comprehensive book on the subject. It offers beginners and advanced modelers alike a minimum theoretical background and a strong focus on the practical solution of geochemical modeling with PHREEQC.
878 kr
Skickas inom 10-15 vardagar
Auch die zweite Auflage von „Grundwasserchemie" bietet als praxisorientierter Leitfaden einen schnellen Einstieg in die thermodynamische Modellierung. Wie in der ersten Auflage helfen detaillierte Beschreibungen der Lösungen dem Nutzer, Schritt für Schritt von einfachen hin zu immer komplexeren hydrogeochemischen Modellierungen zu gelangen.
533 kr
Skickas inom 10-15 vardagar
Preface Uranium is a radioactive element and a heavy metal which is naturally occurring in ground and surface water. Although uranium is enriched in granites and gneiss ground water from these host rocks often shows low to intermediate uranium con centrations, while some ground waters from sandstone and carbonate aquifers show elevated uranium concentrations up to several hundred mg/1 without man made impact. On the other side, surface water contains increased anthropogenic uranium concentrations due to the intensive use of phosphate fertilizers and in mining areas due to mining and milling activities. Saxony and Thuringia both be ing states of the reunified Germany are probably an area where uranium mining activities have impacted the environment more severely than in any other part of the world. Thus, the federal government of Germany allocated huge amounts of money for the rehabilitation work, a unique proceeding without precedent in min ing history. In October 1995 the first international conference on Uranium Mining and Hydrogeology (UMM I) was held in Freiberg being organized by the Department of Geology at the technical University Freiberg by the support of the Saxon State Ministry of Geology and Environment. Due to the large scientific interest in the topic ofuranium a second conference (UMH II) took place in Freiberg in Septem ber 1998.
Groundwater Geochemistry
A Practical Guide to Modeling of Natural and Contaminated Aquatic Systems
Häftad, Engelska, 2017
743 kr
Skickas inom 10-15 vardagar
To understand hydrochemistry and to analyze natural as well as man-made impacts on aquatic systems, hydrogeochemical models have been used since the 1960’s and more frequently in recent times. Numerical groundwater flow, transport, and geochemical models are important tools besides classical deterministic and analytical approaches. Solving complex linear or non-linear systems of equations, commonly with hundreds of unknown parameters, is a routine task for a PC. Modeling hydrogeochemical processes requires a detailed and accurate water analysis, as well as thermodynamic and kinetic data as input. Thermodynamic data, such as complex formation constants and solubility-products, are often provided as databases within the respective programs. However, the description of surface-controlled reactions (sorption, cation exchange, surface complexation) and kinetically controlled reactions requires additional input data. Unlike groundwater flow and transport models, thermodynamic models, in principal, do not need any calibration. However, considering surface-controlled or kinetically controlled reaction models might be subject to calibration. Typical problems for the application of geochemical models are: • speciation • determination of saturation indices • adjustment of equilibria/disequilibria for minerals or gases • mixing of different waters • modeling the effects of temperature • stoichiometric reactions (e.g. titration) • reactions with solids, fluids, and gaseous phases (in open and closed systems) • sorption (cation exchange, surface complexation) • inverse modeling • kinetically controlled reactions • reactive transport Hydrogeochemical models depend on the quality of the chemical analysis, the boundary conditions presumed by the program, theoretical concepts (e.g.