Sökning: "Pre-concentration"

Visar resultat 1 - 5 av 17 avhandlingar innehållade ordet Pre-concentration.

1. 1. Improved techniques for CE and MALDI-MS including microfluidic hyphenations foranalysis of biomolecules

   Författare :Johan Jacksén; Åsa Emmer; Tomas Bergman; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Capillary electrophoresis; Hydrophobic peptides proteins; Matrix-Assisted Laser Desorption Ionization Mass Spectrometry; Prestructured target; Off-line interface; Silicon micro canal; Matrix; Peptide-fluorescein isothiocyanate adducts; Bovine serum albumin; DHAP; Hyphenations; Hydrophobicity; Single wood fiber analysis; Pre-concentration; Concentration platform; Analytical chemistry; Analytisk kemi;

   Sammanfattning : In this thesis, improved techniques for biomolecule analysis using capillary electrophoresis (CE) and matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) and hyphenations between those have been presented.A pre-concentration method which is possible to apply in both techniques, has also been investigated. LÄS MER

3. 2. Analysis of tracer molecules from organic aerosols - Application of liquid phase microextraction to aerosol analysis

   Författare :Murtaza Hyder; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Liquid membrane extraction; Secondary organic aerosols; Enrichment; Tracers; Hollow fiber liquid phase microextraction; Biomass burning; Organic carbon;

   Sammanfattning : Airborne particulate matter is well known because of its adverse impacts on human health and its role in climate processes. In order to understand completely the role of aerosols in atmosphere, their chemical composition is of basic importance. LÄS MER

4. 3. Instrumental and methodological developments for isotope dilution analysis of gaseous mercury species

   Författare :Tom Larsson; Erik Björn; Holger Hintelmann; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mercury; gas; species; speciation analysis; isotope dilution analysis; permeation tubes; Analytical chemistry; Analytisk kemi;

   Sammanfattning : This thesis deals with instrumental and methodological developments for speciation analysis of gaseous mercury (Hg(g)), based on isotope dilution analysis (IDA). The studied species include Hg0, (CH3)2Hg, CH3HgX and HgX2 (where X symbolises a negatively charged counter ion in the form of a halide or hydroxyl ion). LÄS MER

5. 4. New directions in non-porous membrane extraction

   Författare :Eddie Thordarson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extracting syringe; solvent-free; miniaturisation; micro-porous membrane liquid-liquid extraction; polymeric membrane extraction; Non-porous membrane extraction; supported liquid extraction; integration; automation; Analytical chemistry; Analytisk kemi;

   Sammanfattning : Complex biological and environmental samples require a high degree of selectivity in order to determine components therein. Sensitivity measures, such as analyte pre-concentration are often required for assessing composition quantitatively. LÄS MER

7. 5. Analytical Aspects of Atmospheric Pressure Ionisation in Mass Spectrometry

   Författare :C. Fredrik Bökman; J. David Pinkston; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Sammanfattning : The actual signal recorded with an analytical instrument is not always a true reflection of the analysed sample. In this thesis a further insight of the atmospheric pressure ionisation processes electrospray (ESI) and atmospheric pressure chemical ionisation (APCI) has been endeavoured, to provide a deeper understanding of and ways to minimize this bias. LÄS MER