Sökning: "handheld XRF"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden handheld XRF.

  1. 1. APPLICATION OF IN SITU Rb-Sr DATING AND GEOCHEMICAL INVESTIGATIONS ON A NEW, 1.52-1.56 GA. OLD PEGMATITE FIELD IN THE ARCHIPELAGO OFF GOTHENBURG, IDEFJORDEN TERRANE, WESTERN SWEDEN

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Laszlo Zorc; [2023-08-18]
    Nyckelord :;

    Sammanfattning : In this study, Rb-Sr geochronology was used to determine the crystallization/cooling ages of muscovites and biotites from mapped primitive barren and rare element pegmatites in the Stora-Le-Marstrand Formation in the southwestern archipelago of Gothenburg. The results indicate that primitive barrens can be linked to the DG2 deformation event that occurred 1. LÄS MER

  3. 2. Hg concentration in humus soils in different Arctic and Subarctic tundra vegetation types : Including a method comparison for analyzing metals in humus soils

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

    Författare :Alice Sandvärn; [2022]
    Nyckelord :Hg concentration; vegetation types; Arctic tundra; elevation gradient; XRF;

    Sammanfattning : Heavy metals, such as mercury (Hg), have a long residence time in the atmosphere and can be transported long distances and deposited in the Arctic via wet and dry deposition. Still, there are few studies on the complex mercury cycle and how different plant groups absorb Hg. LÄS MER

  4. 3. Hg concentration in humus soils in different Arctic and Subarctic tundra vegetation types : Including a method comparison for analyzing metals in humus soils

    Kandidat-uppsats,

    Författare :Alice Sandvärn; [2022]
    Nyckelord :Hg concentration; vegetation types; Arctic tundra; elevation gradient; XRF;

    Sammanfattning : Heavy metals, such as mercury (Hg), have a long residence time in the atmosphere and can be transported long distances and deposited in the Arctic via wet and dry deposition. Still, there are few studies on the complex mercury cycle and how different plant groups absorb Hg. LÄS MER

  5. 4. Kemikalier på museum : Ett arbetsmiljöproblem som konsekvens av åtgärder mot skadedjur.

    Magister-uppsats, KTH/Ergonomi

    Författare :Anna Klepczynska Nyström; [2017]
    Nyckelord :museum; herbarium; taxidermi; arsenic; sublimate; risk assessment; museum; herbarium; taxidermi; arsenik; sublimat; riskbedömning;

    Sammanfattning : Bakgrund: I museivärlden har man i skyddande syfte fram till 1980-talet behandlat fågel- och djurskinn med arsenikföreningar som har cancerframkallande egenskaper. Torkade museiväxter har behandlats mot ohyra med kvicksilverdiklorid, som succesivt förångas till reproduktionstoxiskt kvicksilver. LÄS MER

  7. 5. Grundämnessammansättning i lössjordar på norra halvklotet

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Anna Oskar; [2017]
    Nyckelord :dust; loess; geochemistry; handheld XRF; Greenland; stoft; lössjord; geokemi; handhållen XRF; Grönland;

    Sammanfattning : The content of atmospheric dust in ice cores from Greenland varies with changes in climate, but the exact relationship is yet unknown. To determine this correlation, the source of the Greenland dust must be known. There are several hypotheses on the location of the source, but no current methods have been sufficient in determining the exact origin. LÄS MER