Sökning: "redox-sensitive elements"

Hittade 3 uppsatser innehållade orden redox-sensitive elements.

  1. 1. Assessing the biodiversity crisis within the Triassic-Jurassic boundary interval using redox sensitive trace metals and stable carbon isotope geochemistry

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Halla Margrét Viðarsdóttir; [2020]
    Nyckelord :Stenlille; Schandelah; redox conditions; C-isotopes; marine sediments; trace elements; enrichment factors; mass extinction; Triassic – Jurassic boundary; Earth and Environmental Sciences;

    Sammanfattning : Around the Triassic-Jurassic-Boundary time interval, a severe mass extinction event occurred, which has been associated to volcanism of the Central Atlantic Magmatic Province (CAMP). Significant amounts of greenhouse gases as carbon dioxide (CO2) or methane (CH4) and other volatiles are suggested to have been released into the atmosphere, leading to global warming with subsequent impact on the biosphere. LÄS MER

  3. 2. 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

  4. 3. Variability in Hydrogeochemical Characteristics in Regions with High Arsenic Groundwater at Matlab, Southeastern Bangladesh.

    Master-uppsats, KTH/Miljögeokemi och ekoteknik

    Författare :Md Moklesur Rahman; [2009]
    Nyckelord :Arsenic; groundwater; Matlab; Bangladesh; variability; redox-sensitive elements; groundwater system;

    Sammanfattning : Elevated levels of geogenic arsenic (As) in groundwater are regarded as the most formidable environmental crisis in the contemporary world and an estimated 30-70 million people in Bangladesh are at risk. Many of the provided options for mitigation have not been well accepted. LÄS MER