Sökning: "Stream Chemistry"

Visar resultat 6 - 10 av 37 uppsatser innehållade orden Stream Chemistry.

  1. 6. Improvement of Pt-based catalyst supported on CeZrO2 used for the high-temperature water-gas shift reaction

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Milda Grikainyte; [2022]
    Nyckelord :Water-gas shift; catalyst; chemical engineering; Chemistry;

    Sammanfattning : The iron-chromium (Fe/Cr) catalyst is used for high-temperature water-gas shift (HT WGS) reaction. A major concern using the Fe/Cr catalyst is that it contains hexavalent chromium (Cr+6) which is a potent carcinogen causing health and environmental issues. LÄS MER

  3. 7. Utvärdering av Tväråns vattenkemi : Källor för metaller och organiska ämnen

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Matilda Hellnersson; [2022]
    Nyckelord :Tvärån; Klockarbäcken; Västerslätt industriområde; Vattenkemi; Metaller;

    Sammanfattning : Tvärån is an urban stream close to the center of Umeå that serve as a recipient of contaminants from various industries. Therefore, the county administrative board (Länsstyrelsen) in Västerbotten were interested in a compilation of water chemistry data from earlier studies done in Tvärån. LÄS MER

  4. 8. Dynamics of streamflow and stream chemistry in a Swiss pre-Alpine headwater catchment : A fine scale investigation of flow occurrence and electrical conductivity in the temporary streams in the lower Studibach catchment

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Elise Baumann; Hanna Berglund; [2021]
    Nyckelord :Temporary Streams; Pre-Alpine Catchment; Streamflow; Stream Chemistry; Fine Scale Investigation; Electrical-conductivity; Stream Mapping; Temporära bäckar; Pre-Alpina avrinningsområden; Bäckflöden; Vattenkemi; Finskalig undersökning; Elektrisk konduktivitet; Bäck-kartering;

    Sammanfattning : Temporary streams and their dynamics have often been largely overseen in hydrological research and there is relatively little knowledge about how the occurrence of flow in these streams varies temporally and spatially. Temporary streams are important from a hydro- logical perspective because they affect water quantity and quality in downstream peren- nial reaches, and from an ecological perspective because they provide habitat to unique species. LÄS MER

  5. 9. The Effects of Depth and Hydrological Connectivity on Heavy Metal Loading in Riparian Zones

    Magister-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Emily Rose Williams; [2021]
    Nyckelord :Riparian zones; metal elements in soils; Discrete Riparian Inflow Zones DRIPs ; riparian soils; metal retention;

    Sammanfattning : The area between a stream and land is known as a riparian zone. These zones are highly dynamic whichcarry and accumulate heavy metals and environmental contaminants. Discrete Riparian Input Zones(DRIPs) are a subset of such zones that carry concentrated amounts of water into streams at discrete points. LÄS MER

  7. 10. Hydrological catchment analysis from characterisation of organic matter in stream water

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Hannes Berg Wiklund; [2020-02-05]
    Nyckelord :Organic matter; Time-of-flight mass spectrometry; aquatic chemistry; catchment hydrology;

    Sammanfattning : Organic matter (OM) in aquatic systems is a complex field which have rapidly developed during the last decade due to the introduction of high resolution mass spectrometers. The composition of OM in the aquatic environment is directly dependent on factors such as oxygen supply, pH and the flow rate in the local system. LÄS MER