Sökning: "Natural organic matter NOM"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden Natural organic matter NOM.

  1. 1. Export and sources of organic carbon in the Lena River basin, Northeastern Siberia

    Detta är en avhandling från Stockholm : Department of Geological Sciences, Stockholm University

    Författare :Liselott Kutscher; Stockholms universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; organic carbon; DOC; POC; organic matter; NOM; DOM; POM; Lena River; organsikt kol; DOC; POC; organiskt material; NOM; DOM; POM; Lenafloden; geokemi; Geochemistry;

    Sammanfattning : Permafrost areas are considered to be one of the largest terrestrial storages of carbon. In a warming climate these areas are expected to experience changes in carbon transport to rivers and the oceans due to permafrost thawing, which could enhance erosion, change water flow pathways and increase greenhouse gas emissions. LÄS MER

  2. 2. Removal of natural organic matter by enhanced coagulation in Nicaragua

    Detta är en avhandling från Stockholm : KTH

    Författare :Indiana García; KTH.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; drinking water; surrogate parameters; enhanced coagulation; natural organic matter; NATURAL SCIENCES Chemistry Environmental chemistry; NATURVETENSKAP Kemi Miljökemi;

    Sammanfattning : The existence of trihalomethanes (THMs) in a drinking water plant of Nicaragua has been investigated in order to see whether the concentration exceeded the maximum contaminant level recommended by the environmental protection agency of the United States (USEPA) and the Nicaragua guidelines. The influence of pH, temperature, chlorine dose and contact time on the formation of THMs were studied. LÄS MER

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

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Kristoffer Hagvall; Umeå universitet.; [2015]
    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. 4. Interactions between Fe and organic matter and their impact on As(V) and P(V)

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Anneli Sundman; Umeå universitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; XAS; Fe III ; As V ; P V ; natural organic matter; Fe II; III -NOM complexes; Krycklan catchment; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys;

    Sammanfattning : Iron (Fe) speciation is important for many biogeochemical processes. The high abundance and limited solubility of Fe(III) are responsible for the widespread occurrence of Fe(III) minerals in the environment. LÄS MER

  5. 5. Intra-annual variability of natural organic matter in boreal streams

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Mattias Winterdahl; Sveriges lantbruksuniversitet.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Natural organic matter (NOM) is a key component in aquatic ecosystems. It influences for example acidity, mobility and toxicity of metals and organic pollutants, energy input to aquatic food webs, weathering, and water light conditions. There are also considerable costs associated with removing NOM in drinking water production. LÄS MER