Sökning: "compound-specific isotope analysis"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden compound-specific isotope analysis.

  1. 1. Compound-specific stable chlorine isotope analysis : A versatile tool for investigating biochemical and geochemical processes of organochlorine substances

    Författare :Henry Holmstrand; Per Andersson; Örjan Gustafsson; Neil Sturchio; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; compound-specific chlorine isotope analysis; chlorinated organic compounds; Environmental chemistry; Miljökemi;

    Sammanfattning : Chlorinated organic compounds (OCls) from anthropogenic sources are generally considered to be a class of chemicals with high potential for ecotoxicity, including infamous substances such as polychlorinated biphenyls (PCB), dichloro-dibenzo-trichloroethane (DDT) and polychlorinated dibenzo-p-dioxins (PCDD). OCls are also produced naturally, sometimes at the same order of magnitude as anthropogenic compounds. LÄS MER

  3. 2. Stable chlorine isotope analysis of chlorinated acetic acids

    Författare :Milena Edith Ivansson; Henry Holmstrand; Örjan Gustafsson; Teresia Svensson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stable chlorine isotope analysis; chlorinated acetic acids; compound-specific isotope analysis;

    Sammanfattning : Chlorinated acetic acids (CAAs) constitute a group of polar organic compounds that are ubiquitous in the environment. Their environmental occurrence has been extensively studied but their sources are still not well constrained. LÄS MER

  4. 3. Compound-specific bromine isotope analysis of methyl bromide using GC-multiple collector mass spectrometry

    Författare :Axel Horst; Örjan Gustafsson; David Bastviken; Ulla Sellström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The isotopic composition of ozone depleting methyl halides may provide valuable information on the sources and sinks of these compounds. However, so far mostly stable carbon isotope analysis of methyl chloride and methyl bromide has been at­tempted. LÄS MER

  5. 4. Coping with environmental change : Lessons from isotope studies in a sentinel species

    Författare :Matias Ledesma; Agnes Karlson; Marleen De Troch; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stable isotope; compound-specific nitrogen stable isotope analysis; trophic niche; harmful algae blooms; contaminants; stress; reproductive success; environmental change; Baltic Sea; marin ekologi; Marine Ecology;

    Sammanfattning : Adaptive evolution and phenotypic plasticity are two key mechanisms by which natural populations avoid extinction in the face of environmental change. Evolutionary young systems, such as the Baltic Sea with low species diversity and steep environmental gradients, are good models for studying how wild populations cope with environmental changes, such as climate-induced alterations in food supply and exposure to environmental contaminants. LÄS MER

  7. 5. Application of two dimensional compound specific carbon-chlorine isotope analyses for degradation monitoring and assessment of organic pollutants in contaminated soil and groundwater

    Författare :Charline Wiegert; Örjan Gustafsson; Thomas Hofstetter; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; organochlorines; chlorinated ethenes; PCE; TCE; hexachlorocyclohexanes; soil contamination; groundwater contamination; remediation; natural attenuation; biodegradation; carbon isotopes; chlorine isotopes; CSIA; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Nearly 250,000 sites with past and present potentially polluting activities need urgent remediation within Europe. Major pollutants include organochlorines (OCls), e.g. chlorinated ethenes (CEs) and hexachlorocyclohexanes (HCHs), mainly used as industrial solvents and pesticides, respectively. LÄS MER