Sökning: "goethite"

Visar resultat 1 - 5 av 22 avhandlingar innehållade ordet goethite.

  1. 1. Coordination Chemistry of Monocarboxylate and Aminocarboxylate Complexes at the Water/Goethite Interface

    Detta är en avhandling från Umeå : Kemi

    Författare :Katarina Norén; Per Persson; Staffan Sjöberg; Stephan J. Hug; [2007]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Acetate; benzoate; adsorption; surface complex; ternary surface complexes; ATR-FTIR spectroscopy; EXAFS spectroscopy.; cyclohexanecarboxylate; sarcosine; MIDA; EDDA; EDTA; gallium III ; goethite; mineral surface; MEDICINE Chemistry; MEDICIN Kemi;

    Sammanfattning : This thesis is a summary of five papers with focus on adsorption processes of various monocarboxylates and aminocarboxylates at the water/goethite interface. Interaction of organic acids at the water/mineral interfaces are of importance in biogeochemical processes, since such processes have potential to alter mobility and bioavailability of the acids and metal ions. LÄS MER

  2. 2. Aqueous surface chemistry of Goethite adsorption and desorption reactions involving phosphate and carboxylic acids

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Malin Lindegren; Per Persson; Staffan Sjöberg; Alan Stone; [2009]
    Nyckelord :;

    Sammanfattning : Phosphorus is an essential element for all known forms of life. In the form of phosphate, this nutrient is retained in soils and sediments by sorption on mineral particles, clays and other soil constituents. LÄS MER

  3. 3. Phase transformation and surface chemistry of secondary iron minerals formed from acid mine drainage

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Jörgen Jönsson; Lars Lövgren; Per Persson; Staffan Sjöberg; Douglas B Kent; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; schwertmannite; goethite; lepidocrocite; acid mine drainage; sulphate; natural organic matter; mineral surface; infrared spectroscopy; EXAFS; XRD; ternary surface complex; copper II ; cadmium II ; lead II ; zinc II ; Oorganisk kemi; NATURAL SCIENCES Chemistry Inorganic chemistry; NATURVETENSKAP Kemi Oorganisk kemi; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : The mining of sulphidic ore to extract metals such as zinc and copper produces huge quantities of waste material. The weathering and oxidation of the waste produces what is commonly known as Acid Mine Drainage (AMD), a dilute sulphuric acid rich in Fe(II) and heavy metals. LÄS MER

  4. 4. Modeling of glyphosate and metal-glyphosate speciation in solution and at solution-mineral interfaces

    Detta är en avhandling från Umeå : Kemi

    Författare :Caroline Jonsson; Staffan Sjöberg; Per Persson; Bernd Nowack; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; herbicide; glyphosate; surface complexation model; speciation; goethite; aged gamma-alumina; bayerite; manganite; cadmium II ; aluminium III ; potentiometric titration; adsorption; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi;

    Sammanfattning : Glyphosate (N-(phosphonomethyl)glycine, PMG, H3L) is a widely used organophosphorous herbicide. It interacts with metal ions and mineral surfaces, which may affect its mobility, degradation and bioavailability in the environment. However, these interactions are far from fully understood. LÄS MER

  5. 5. Solubility and Surface Complexation Studies of Apatites

    Detta är en avhandling från Umeå : Kemi

    Författare :Åsa Bengtsson; Staffan Sjöberg; Per Persson; Lars Lövgren; Laurent Charlet; [2007]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; apatite; dissolution; calcium; phosphate; fluoride; goethite; surface complexation; speciation; outer-sphere complexation; FTIR; XPS; potentiometry; MEDICINE Chemistry; MEDICIN Kemi;

    Sammanfattning : Apatites are a diverse class of phosphate minerals that are important in a great variety of natural and industrial processes. They are, for example, used as raw material in fertiliser production and in the remediation of metal-contaminated soils. LÄS MER