Browsing by Subject "platinum"

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Access status: Restricted ,
Cu-Ni-PGE mineralization in the Morrison deposit, Sudbury
(Data obrony: 2017-07-20) Foltyn, Krzysztof
Wydział Geologii, Geofizyki i Ochrony Środowiska
Ore in Morrison deposit (Sudbury) is rich in copper, nickel, platinum, palladium and gold. Chalcopyrite dominates mineral assemblage, while the main Ni-bearing phases are pentlandite and millerite. Cubanite, pyrrhotite, mackinawite, magnetite, sphalerite and galena are accessory minerals. Platinum occurs as discrete minerals: moncheite ($PtTe_{2}$) grains with hessite ($Ag_{2}Te$), maslovite (PtBiTe) and sperrylite ($PtAs_{2}$). Palladium might occur as a substitution in pentlandite and as a discrete PGM phases: michenerite (PdBiTe) and paolovite ($Pd_{2}Sn$). Observed zonation in the deposit can be explained by fractional crystallization of magmatic sulfides. There is a possibility of partial remobilization of precious metals (especially gold) by later hydrothermal and/or metamorphic processes which are represented by authigenic quartz, silicates (epidote, amphiboles) and secondary magnetite containing sulphide inclusions.
Access status: Open Access ,
Influence of platinum ions on the germination and seedling root growth of different plant species
(Wydawnictwa AGH, 2014) Kołton, Anna; Czaja, Monika
For several decades an increase of platinum in the environment was recorded. This is connected with the release of platinum from automobile catalytic converters and pharmaceutical industries. In the conducted experiments the effect of various forms and concentrations of platinum on the germination and roots growth of different plants (oat, garden cress and tomato) was investigated. Two separate experiments were performed with lower (experiment 1$^{st}$: 1, 5 and 10 mg/L) and higher (experiment 2$^{nd}$: 10, 20 and 40 mg/L) $[Pt(NH_{3})_{4}](NO_{3})_{2}$ or $PtCl_{4}$ dosages. There was no significant effect of dose and form of platinum on the germination of seeds (experiment 1$^{st}$ and 2$^{nd}$). The effect of platinum containing substances dose on root growth of young seedlings was observed during experiment, dependent on the species of tested plants. The root length of oat plants was similar in all treatments in experiment 1$^{st}$. The shortest tomato roots were observed in the case of a 10 mg/L of $PtCl_{4}$, it was statistically shorter than the control plants (treated with water) as well. The roots of the tomato treated with $[Pt(NH_{3})_{4}](NO_{3})_{2}$ were the same length as observed for the control sample. The garden cress root growth was not affected by $[Pt(NH_{3})_{4}](NO_{3})_{2}$, but a solution containing $Pt^{4+}$ stimulated the root growth. The roots of tomato and oat treated with $[Pt(NH_{3})_{4}](NO_{3})_{2}$ had similar length as the control plants in contrast to the far shorter roots treated with $PtCl_{4}$ (experiment 2$^{nd}$). Moreover, the treatment with $[Pt(NH_{3})_{4}](NO_{3})_{2}$ stimulated the growth of garden cress roots compared to the control, while only the lowest dose of $PtCl_{4}$ stimulated the root growth.
Access status: Restricted ,
Występowanie metali szlachetnych w strefie złoża „zawieszonego” w południowej części OG „Polkowice”, O/ZG „Polkowice- Sieroszowice” (oddział G-12)
(Data obrony: 2018-11-28) Sopel, Alicja
Wydział Geologii, Geofizyki i Ochrony Środowiska
W pracy dokonano analizy prób pochodzących z obszarów graniczących ze strefą wtórnego utlenienia w złożu rud miedzi na monoklinie przedsudeckiej, pod kątem występowania metali szlachetnych (Au, Pt, Pd). Próby pobierane były z oddziału G-12 w południowej części obszaru górniczego Polkowice. Analizy obejmowały opis makroskopowy i mikroskopowy cząstek, badania chemiczne na zawartość złota, platyny, palladu i miedzi, badania w mikroobszarze wystąpień złota i minerałów towarzyszących. Wynikiem była charakterystyka stref występowania podwyższonych zawartości metali szlachetnych. Graficznie przedstawiono ich ilość oraz relacje pionowe w analizowanych profilach, formy i paragenezy mineralne oraz położenie względem złoża miedzi.