Sökning: "Gibbsite"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet Gibbsite.

  1. 1. Surface chemistry of Al and Si (hydr)oxides, with emphasis on nano-sized gibbsite (α-Al(OH)3)

    Författare :Jörgen Rosenqvist; Umeå universitet; []
    Nyckelord :Gibbsite; silica; kaolinite; surface complexation; protonation; adsorption; carboxylates; modeling; AFM; IR; XPS;

    Sammanfattning : This thesis contains an introduction to the surface chemistry of minerals in aqueous environment, and a summary of five manuscripts concerning adsorption reactions at the surfaces of nano-sized gibbsite (α-Al(OH)3), amorphous silica and kaolinite. Nano-sized gibbsite was synthesized and thoroughly characterized using X-ray diffraction, high-resolution transmission electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy. LÄS MER

  3. 2. Characterization of aluminum in environmental systems using X-ray absorption and vibrational spectroscopy : The importance of organic matter

    Författare :Kristoffer Hagvall; Torbjörn Karlsson; Per Persson; Lars Lövgren; Dan Berggren Kleja; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The fate and behavior of many metals in the environment are highly dependent on interactions with natural organic matter (NOM), which is abundant in most soils and surface waters. The complexation with NOM can influence the speciation of the metals by affecting their hydrolysis and solubility. LÄS MER

  4. 3. Pit lakes from sulphide ore mining, geochemical and limnological characterization before treatment, after liming and sewage sludge treatments : cases studies at Rävlidmyran and Udden, Sweden

    Författare :Ming Lu; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Due to the increasing number of acidic mining-pit lakes and a growing awareness of the environmental risks associated with them, pit lakes have attracted more and more attention. This study started with a full-year- round investigation of two abandoned sulphide mine pit lakes, the Rävlidmyran and Udden pit lakes in northern Sweden, followed by studies of two full-scale remediation treatments, liming and sewage sludge treatment, respectively, in the Rävlidmyran pit lake. LÄS MER

  5. 4. Dynamics of forest soil chemistry

    Författare :Mattias Alveteg; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical technology and engineering; critical loads; regional; recovery; acidification; modelling; SAFE; MAKEDEP; Kemiteknik och kemisk teknologi; Environmental technology; pollution control; Miljöteknik; kontroll av utsläpp;

    Sammanfattning : Acidification caused by emissions of Nitrogen and Sulphur and associated adverse effects on forest ecosystems has been an issue on the political agenda for decades. Temporal aspects of soil acidification and/or recovery can be investigated using the soil chemistry model SAFE, a dynamic version of the steady-state model PROFILE used in critical loads assessment on the national level, e. LÄS MER

  7. 5. Aqueous geochemistry of pit lakes : two cases studies at Rävlidmyran and Udden, Sweden

    Författare :Lu Ming; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Two abandoned pit lakes in northern Sweden were studied in order to improve the understanding of the geochemistry of pit lakes, Rävlidmyran Pit Lake and Udden Pit Lake. Both lakes show strong similarity with other mining lakes in terms of low pH and high metal and sulphate contents. LÄS MER