Browsing by Subject "PHREEQC"

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Charakterystyka hydrogeochemiczna wód eksploatowanych w złożu Mateczny
(Data obrony: 2013-12-18) Kurek, Katarzyna
Wydział Geologii, Geofizyki i Ochrony Środowiska
This thesis presents the characteristic of therapeutic water deposit in Mateczny (Krakow). The mineral water from Mateczny are therapeutic sulphurous water. Water exploited in Mateczny are of the type: $SO_{4}—Cl—Na—Mg—Ca$, $H_{2}S$. They can be used in balneotherapy. There is a description of location, geological and hydrogeological conditions of water deposit in Mateczny. The thesis presents chemical characteristic of waters and their changes in time. Results of hydrgeochemical modeling in PHREEQC are presented as well.
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Eksperymentalny model przemian cerusytu $PbCO_{3}$ w hydroksylmimetyt $Pb_{5}(AsO_{4})_{3}OH$
(Data obrony: 2012-07-16) Kosobudzka, Anna
Wydział Geologii, Geofizyki i Ochrony Środowiska
Bioavailability of $Pb$ and $A$s depends strongly on thermodynamic stability of crystalline species controlling their concentration in solutions. However, the mechanisms of transformation of more soluble cerrusite $PbCO_{3}$ into less soluble lead apatites are not well understood. In this study, the concentration of aqueous $Pb^{2+}$ and formation of secondary phases were monitored during dissolution of cerrusite $PbCO_{3}$ in the presence of $AsO_{4}{ ^{3-}}$ at various pH. XRD and SEM/EDS analyses indicate that hydroksylmimetite $Pb_{5}(AsO_{4})_{3}OH$ is the only reaction product at alkaline pH. In acidic solutions the main product of cerrusite reaction with arsenate ions is more soluble and less stable shultenite $PbHAsO_{4}$. Control reaction with lead ions from $Pb(NO_{3})_{2}$ allows to determine a $CO_{3}{^{2-}}$ substitution in the structure of lead apatites precipitating in the presence of cerrusite.
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Geochemia przemian minerałów skałotwórczych pod wpływem wód lodowcowych na Spitsbergenie
(Data obrony: 2011-07-07) Kwaśniak-Kominek, Monika
Wydział Geologii, Geofizyki i Ochrony Środowiska
This study focused on characteristics of mechanisms of chemical weathering and mineral transformations in young polar soils of Spitsbergen (Arctic). The study area is located on the foreland of a retreating glacier. Mineral composition of the bottom moraine in the foreland of the glacier as well as chemical composition and physicochemical parameters of pore waters were determined. The dominating processes governing the system were inferred from characteristics and correlation of mineral surfaces in micro scale (scanning electron microscopy) with bulk chemistry of pore waters. Computer program PHREEQC was used to model the mechanisms of mineral-water interaction and weathering reactions. Soils from this area are in the initial stage of development and the dominant minerals in the skeleton are minerals from country rocks. Secondary minerals were determined mostly in the older sediment. The study shows a strong correlation between pore water chemistry and progress of mineral alterations with the distance from the front of the glacier.