Sökning: "Ferrihydrite"

Visar resultat 1 - 5 av 13 uppsatser innehållade ordet Ferrihydrite.

  1. 1. How is carbon stored in boreal forest soils? - A method development which investigates at what protein concentration ferrihydrite and goethite are saturated.

    Kandidat-uppsats, Lunds universitet/Centrum för miljö- och klimatvetenskap (CEC)

    Författare :Louise Berild; [2023]
    Nyckelord :Soil nitrogen; soil carbon; boreal forest; ectomycorrhizal fungi; decomposition; adsorption; ferrihydrite; goethite; Earth and Environmental Sciences;

    Sammanfattning : Boreal forests store the majority of their carbon in the soil and play an important role in the global carbon cycle. However, the mechanisms that control carbon storage in boreal soils are not well understood. LÄS MER

  3. 2. Solubility of arsenic in untreated and ZVI-treated contaminated aquifer material

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Oscar R. Davies; [2022]
    Nyckelord :Hjältevad; zerovalent iron; phosphate extraction; Oxalate extraction; Visual MINTEQ; geochemical modelling;

    Sammanfattning : Arsenic (As) is a toxic element to all life and exists in nature both naturally and anthropogenically. Naturally As contaminated soils are formed due to high geogenic background As concentrations which is released when bedrock is eroded. Asia is a continent with a high amount of naturally As contaminated soils and groundwater. LÄS MER

  4. 3. Arseniks löslighet i grundvattenakviferen i Hjältevad : Utvärdering med geokemisk modellering

    Uppsats för yrkesexamina på avancerad nivå,

    Författare :Martina Fastlund; [2018]
    Nyckelord :arsenik; arsenit As[III]; arsenat As[V]; adsorption; ferrihydrit; kd-värden; laktester; mobilisering; oxiderande förhållanden; pH; redoxpotential; reducerande förhållanden;

    Sammanfattning : Excessive concentrations of arsenic in soil- and groundwater constitute a global issue. The spread of arsenic is due to both natural and anthropogenic effects in the environment. Historically, the anthropogenic emissions have originated from several different industrial sectors e.g. LÄS MER

  5. 4. Removal of arsenic from groundwater using adsorption to ferrihydrite-coated laterite in Burkina Faso

    Kandidat-uppsats, KTH/Mark- och vattenteknik

    Författare :Agnes Hagstroem; [2017]
    Nyckelord :;

    Sammanfattning : In several parts of Burkina Faso, there is an urgent need of making arsenic contaminated water potable. The shallow, dug out wells traditionally used in the rural areas provides small, inconsistent yields and are vulnerable to microbes. LÄS MER

  7. 5. Geochemical processes in mine waste subjected to a changing chemical environment: Fe speciation in leachate water from column experiments

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Paula Lundberg; [2017]
    Nyckelord :Sulfidic mine waste; Sulfide oxidation; Water quality; Environmental analytical chemistry; Iron redox speciation;

    Sammanfattning : Oxidation of sulfidic mine waste is of significant environmental concern due to the consequent formation of acid rock drainage (ARD), deteriorating the water quality of natural water systems. Iron (Fe) and sulfur (S) are two major redox elements involved in these reactions and typically the major redox-sensitive elements (whose solubility, speciation, and mobility are affected by pH and Eh) in water affected by ARD. LÄS MER