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    Wyświetlanie 1-3 z 3
    Tytuł:
    Synthesis and solubility of hopeite Zn3(PO4)2·4H2O
    Autorzy:
    Bajda, Tomasz
    Rogowska, Melania
    Pawłowska, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/46220160.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    zinc
    phosphate
    apatite
    dissolution
    solubility product
    Opis:
    Minerals from the phosphate groups are used in environmental engineering as thermodynamically stable vehicles for heavy metals such as zinc. The hopeite Zn3(PO4)2·4H2O was synthesized and characterized by X-ray diffraction and scanning electron microscopy. The solubility of the hopeite was measured at 25°C. The average solubility product, log Ksp, for the reaction Zn3(PO4)2·4H2O ⇔ 3Zn2+ + 2PO4 3− + 4H2O at 25°C is –35.72 ± 0.03. The free energy of formation, ΔG°f ,298, calculated from this measured solubility product is –3597.4 ± 1.0 kJ mol−1. The immobilization of zinc in the hopeite structure offers the possibility of developing an effective method for removing Zn from wastewater, water and soils.
    Źródło:
    Mineralogia; 2023, 54, 1; 78-81
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and solubility of brompyromorphite Pb5(PO4)3Br
    Autorzy:
    Janicka, Urszula
    Bajda, Tomasz
    Manecki, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/127627.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    lead
    phosphate
    apatite
    dissolution
    brompyromorphite
    solubility product
    Opis:
    The bromide analogue of pyromorphite Pb5(PO4)3Br was synthesized and characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The solubility of the brompyromorphite was measured at 25°C and pH values of 2.0, 2.6 and 3.2. For the 3 pH measurements, the average solubility product, log KSP, for the reaction Pb5(PO4)3Br 5Pb2+ + 3PO4 3– + Br– at 25ºC is –77.38 ± 0.70. The free energy of formation, Gf,298, calculated from this measured solubility product is –3724.7 ± 4.3 kJ mol−1. These results confirm that brompyromorphite is more soluble than pyromorphite.
    Źródło:
    Mineralogia; 2012, 43, 1/2; 129-135
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Litogenolitic and solubility properties of products obtained from common ivy extract (Hederae helicis e folium) and medium of diversified polarity (ԐM)
    Autorzy:
    Nowak, E.
    Marczynski, Z.
    Skibska, B.
    Nachajski, M.J.
    Jambor, J.
    Zgoda, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/72008.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    litogenolitic property
    solubility property
    product
    common ivy
    plant extract
    dry extract
    Hedera helix
    diversified polarity
    cholesterol
    hederasaponin C
    Opis:
    Introduction: Common ivy (Hedera helix) is a plant used successfully in the treatment of various ailments. This is possible owing to the unique set of substances contained in it such as large amount of saponins, flavonoids, phenolic acids and phytosterols as well as polyacetylenes and coumarins. All these substances have been used in the production of cosmetic and medicinal preparations. Clinical trials on the efficacy and safety of dry ivy leaf extract have shown its high efficacy, comparable to synthetic medications, and better tolerance of herbal drugs. Objective: Investigations were performed on model ivy leaf (Hedera helix) extracts which were created using a medium of diversified polarity (ԐM). Measurements of viscosity and surface activity on phase boundary were performed. During preformulation studies attention was drawn to the possibility of micellar solubilization of cholesterol and selected structures of nonsteroidal anti-inflammatory drugs (NSAIDs) – ketoprofen. Methods: Viscosity measurements of Extractum Hederae helicis e folium aqueous solutions and in 0.1 mol HCl were performed according to the Polish Standard with Ubbelohde dilution viscometer. The surface tension of aqueous solutions – Δγ25 of Hederae helicis e folium extracts was determined according to the Polish Standard with stalagmometric method . Critical micellar concentration (cmc) was calculated. This enabled to evaluate the dependence ΔG0 =2.303 RT× log cmc of the thermodynamic potential of micelle formation (ΔG0 ). Results: It has been confirmed in the conducted comparative studies that aqueous solutions of Extr. Hederae helicis e folium created with maltodextrin as well as with SiO2 – maltodextrin result in micellar solubilization. The increase of granulometric size of cholesterol particle to Ø 1.60 mm decreased the amount of solubilized cholesterol but solubility preferences of the extracts were maintained. Conclusions: Model extracts produced from Hederae helicis e folium with diversified polarity of the extraction medium (water – ethanol) are characterized by appropriate solubility of the components which results not only from the presence of chlorophyll and its derivatives in the extract but also from the technique used for spray drying of the extract.
    Źródło:
    Herba Polonica; 2019, 65, 1
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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