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    Wyświetlanie 1-4 z 4
    Tytuł:
    Silica solubility in groundwater from Permian volcanogenic rocks (the Sudetes Mts., SW Poland) : the role of reversible aluminosilicate solids
    Autorzy:
    Dobrzyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059124.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Sudetes
    groundwater chemistry
    volcanic rocks
    silicon
    aluminium
    hydroxyaluminosilicates (HAS)
    allophanes
    Opis:
    The chemistry of groundwater in Permian volcanic rocks (rhyolitic tuffs, trachyandesites) in two small headwater catchments (the SudetesMts., SW Poland) has been investigated. The calculated transfer of silica released during weathering is greater than the real concentration in groundwater, and indicates that part of the silica is immobilized in secondary aluminosilicates. Silica solubility is interpreted in terms of the solubility of reversible secondary aluminosilicates (allophanes, hydroxyaluminosilicates). Partial chemical equilibrium of these phases is sometimes locally achieved. In groundwaters with pH above 6.7 from trachyandesites of the BukowiecMt. type, chemical equilibrium with respect to the hydroxyaluminosilicate HASB is probably maintained. Its solubility constant, calculated accordingly to the method given by Schneider et al. (2004), is lgK HASB = –44.74 (۪.52), and indicates that this "field" HASB has a solubility lower than the published experimental value (lgK HASB = –40.6 ۪.15) for synthetic HASB (op.cit.). Non-equilibrium with respect to aluminosilicates in groundwaters from rhyolitic tuffs and from trachyandesites of the Stożek Wielki Mt. type is caused by the short turn-over time of groundwater in the systemand by the poor neutralisation capacity of the bedrock. The silica concentration in these groundwaters results from steady-state conditions achieved between weathering release, hydrological removal and precipitation of secondary phases. The hydrogeochemical data are conducive to the presence of allophane minerals in the weathered rhyolitic tuffs.
    Źródło:
    Geological Quarterly; 2006, 50, 4; 407-417
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania potencjału redoks na przykładzie sudeckich wód leczniczych
    Research of redox potential on the example of curativewaters in the Sudetes Mts., Poland
    Autorzy:
    Dobrzyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074741.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    chemizm wód podziemnych
    ptencjał redoks
    wody lecznicze
    Sudety
    groundwater chemistry
    redox potential
    curative water
    Sudetes
    Opis:
    In Poland, the redox potential (EH) is seldomly measured in groundwater. Since the year 2006 determination of redox potential is required for documenting properties of curative mineral waters. Investigations of redox conditions in groundwater need both proper measurement and interpretation. In the paper, crucial questions of: 1) redox equilibrium in groundwater, 2) field measurement, 3) correction methods, and 4) EH interpretation are presented. Some aspects of applying the redox potential for interpreting groundwater chemistry and using geochemical modelling are illustrated by hydrochemical data of curative waters from spas in the Sudetes Mts., SW Poland. Main reasons of the common redox non-equilibrium found in groundwater are co-existence of numerous aqueous redox pairs and usually non-equilibrium in particular redox pairs. Redox determinations have to be done in the field, and require extreme cleanness and precision, e.g., measuring without contact with the atmospheric air. Field measurements must be corrected to the standard hydrogen electrode, considering: type of reference electrode, concentration of electrode filling solution, type of standard redox solution, and water temperature. The redox potential has been measured in water at first from all the Sudetic spas, totally in 33 water intakes. In curative waters from the Sudetes corrected EH ranges between –159 mV and +343 mV. Usually, thermal waters show lower EH values than cold, CO2-rich waters. The lowest redox potential was found in the hottest thermal waters, i.e., in water from Zdzisław intake (in Lądek Zdrój) and C-2 intake (in Cieplice Śląskie Zdrój). Generally, the higher the pH, the lower the EH in groundwater. Methods of geochemical modelling, which are often and often applied in groundwater research, also require the EH determination. Information about EH are used in the calculation of speciation models of water, and affect the results of whole geochemical modelling as well as evaluations of the saturation state. The speciation-solubility modelling for the Sudetic curative waters, presented in the paper, shows that the proper correction of field EH measurement determines the quality of calculations. Improperly corrected EH values might lead to species activity errors, even up to several order of magnitudes, and erroneous interpretation of the mineral phases stability in the hydrogeochemical system.
    Źródło:
    Przegląd Geologiczny; 2010, 58, 1; 46-53
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie częściowych równowag chemicznych w kształtowaniu chemizmu wód podziemnych w systemach krzemianowych strefy wietrzenia
    The importance of partial chemical equilibrium for the formation of groundwater chemistry in silicate systems of the weathered zone
    Autorzy:
    Dobrzyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074527.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    skład chemiczny wód podziemnych
    poziom równowagi chemicznej
    modelowanie geochemiczne
    wtórne fazy mineralne
    allofany
    koloidy glinokrzemianowe HAS
    groundwater chemistry
    partial chemical equilibrium
    geochemical modelling
    secondary aluminosilicate phases
    allophanes
    hydroxyaluminosilicate colloids (HAS)
    Opis:
    Partial chemical equilibrium plays an important role in geochemical systems. In the short turn-over time zone of hydrogeological systems, the conditions for the full chemical equilibrium amongst groundwaters, mineral phases and gases are rarely fulfilled. In these systems, partial chemical equilibrium is often responsible for controlling activity of solutes. Examples of partial chemical equilibrium with secondary phases in silicate systems of the weathered zone are given, and the role of metastable and stable secondary silicate solids is discussed.
    Źródło:
    Przegląd Geologiczny; 2007, 55, 6; 460-466
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie geochemiczne narzędziem poznania geochemii systemów wód podziemnych. Przykłady zastosowań, aktualny stan w Polsce
    Geochemical modelling-a tool for understanding geochemistry of groundwater systems. Case studies, and present-day state in Poland
    Autorzy:
    Dobrzyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074438.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    geochemia
    modelowanie
    woda podziemna
    geochemical modelling
    water chemistry
    groundwater
    Opis:
    Potential of geochemical modelling for groundwater systems, with the most important up-to-date literature was concisely described. Case studies considering different methods of geochemical modelling used for understanding of groundwater systems geochemistry are presented. Most of case studies concern modelling of groundwater in short turn-over time zone in the Sudetes Mts. (SW Poland). Present-day geochemical modelling state-of-art in Poland was discussed and evaluated.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 11; 976-981
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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