Sökning: "Tillämpad geologi"

Visar resultat 6 - 10 av 95 avhandlingar innehållade orden Tillämpad geologi.

  1. 6. Multi-element analysis of environmental samples using LA-ICP-MS : method developments with emphasis on calibration strategies

    Författare :Mikael D. Axelsson; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Analytical applications based on the use of laser ablation-inductively coupled plasma-sector field mass spectrometry (LA-ICP-SFMS) have shown great potential for both quantitative and qualitative determination of elements in a variety of materials, although the weak point is finding a suitable calibration approach. The major focus of this work has, therefore, been internal standardisation and calibration. LÄS MER

  3. 7. Multielemental analysis of geological and biological samples using laser ablation ICP-SFMS

    Författare :Mikael D. Axelsson; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : The analytical performance of laser ablation (LA) for multielemental determination of geological and biological samples has been investigated. In the present study, LA has been used for sample introduction in inductively coupled plasma sector field mass spectrometry (ICP-SFMS). LÄS MER

  4. 8. Dissolved and suspended transport of tungsten, molybdenum, and vanadium in natural waters

    Författare :Susanne Bauer; Johan Ingri; Carl-Magnus Mörth; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tungsten; molybdenum; vanadium; Baltic Sea; redox cycling; suspended particles; boreal rivers; Applied Geology; Tillämpad geologi;

    Sammanfattning : Some transition metals and metalloids occur primarily as oxyanions in natural waters including antimony, arsenic, chromium, molybdenum, tungsten and vanadium. These oxyanions can pass through cell walls along the same pathways as phosphate or sulfate. Some of these oxyanions are essential for life, but in high concentrations they become all toxic. LÄS MER

  5. 9. Role of manganese redox cycling for trace metals in the Baltic Sea

    Författare :Susanne Bauer; Per Hall; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Redox zones are defined by steep gradients of changing concentrations and changing redox potential. They form a transition zone between oxic and anoxic/sulfidic conditions, where nitrate, manganese and iron reduction occurs. These redox zones can be situated in the sediment as well as in the water column. In the Baltic Sea both types are found. LÄS MER

  7. 10. Geochemical studies of north Swedish rivers using inductively coupled plasma optical emission spectroscopy for multielement determinations

    Författare :Jan-Ola Burman; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : .... LÄS MER