Taloženje kalcijeva karbonata u umjetnoj krškoj vodi uz dodatak odabranih okolišnih i antropogenih molekula

Matijaković Mlinarić, Nives (2021) Taloženje kalcijeva karbonata u umjetnoj krškoj vodi uz dodatak odabranih okolišnih i antropogenih molekula. Doctoral thesis, Sveučilište u Zagrebu, Prirodoslovno matematički fakultet.

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Abstract

In this disertation, the physico-chemical analyzes of karst water and travertine were performed in the Plitvice Lakes National Park. Due to the most intensive mineralization, high pH and supersaturation the chemical composition of water on the Lake Novakovića brod was chosen for comparison of precipitation in nature and in laboratory conditions in artificial karst water. Using a laboratory model of calcium carbonate (CaCO3) precipitation the influence of environmental molecules (humic acid, HA and fulvic acid, FA) and anthropogenic ions (phosphate, PO43− and polyphosphate, (PO3−)n) were investigated. Spontaneous precipitation experiments, in the range 10 ° C < θ < 25 °C, have shown that the added additives change the morphology, polymorph composition and inhibit the formation of vaterite and aragonite: (PO3−)n > (FA ≈ HA) > PO43−. Lower temperatures cause the formation of smaller amounts of CaCO3 and with the addition of the high concentrations of additives, the precipitation of CaCO3 is completely inhibited. Rhombohedral {104} calcite and plate-like {001} calcite were used for crystal growth experiments in artificial karst water. Analysis of kinetic measurements showed that the growth of {104} calcite and {001} calcite crystals in artificial karst water, θ = 20 ° C, occurs on a spiral dislocation and that the growth of {104} calcite is much faster than the growth of {001} calcite. The addition of additives causes inhibition of {104} and {001} calcite growth: (PO3−)n > (FA ≈ HA) > PO43−. The applied additives cause a change in the growth mechanism, which becomes controlled by surface nucleation.

Item Type:

Thesis (Doctoral thesis)

Uncontrolled Keywords:

anthropogenic molecules; karst water; environmental molecules; plate-like calcite; crystal growth; rhombohedral calcite; tufa; spontaneous precipitation

Subjects:

NATURAL SCIENCES > Chemistry > Physical Chemistry
NATURAL SCIENCES > Chemistry > Inorganic Chemistry
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science

Divisions:

Division of Materials Chemistry

Projects: