Search for dissertations about: "analytical precision"

Showing result 1 - 5 of 109 swedish dissertations containing the words analytical precision.

2. 1. Fundamental Studies on Direct Injection Nebulisers for Sample Introduction in ICP Spectrometry : Aerosol Properties, ICP Characteristics and Analytical Performance

   Author : Daniel Goitom Asfaha; Wolfgang Frech; Ralph Edward Sturgeon; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ICP; ICP-MS; ICP-OES; sample introduction; DIHEN; Vulkan DIN; non-spectral interferences; noise power spectra; analytical precision; plasma diagnostic parameters; particle dynamic analysis PDA ; Analytical chemistry; Analytisk kemi;

   Abstract : The performance of different types of nebulisers: Vulkan direct injection nebuliser (Vulkan DIN), direct injection high efficiency nebuliser (DIHEN), microconcentric nebuliser coupled to cyclonic or double pass spray chamber (MCN-C or MCN-DP, respectively) was investigated and compared when used for sample introduction to ICP-MS or ICP-OES. With ICP-OES, in axial viewing mode, intensity distributions across the radius of the plasma (radial intensity profiles) were determined for different spectral lines with Esum 1. READ MORE

4. 2. Liquid Chromatography – Mass Spectrometry Analysis of Short-lived Tracers in Biological Matrices : Exploration of Radiotracer Chemistry as an Analytical Tool

   Author : Martin Lavén; Karin Markides; Bengt Långström; Rolf Ekman; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; liquid chromatography - mass spectrometry; radiotracer chemistry; positron emission tomography; biological samples; radionuclide imaging; Analytisk kemi; Analytical chemistry; Analytisk kemi;

   Abstract : Liquid chromatography – mass spectrometry (LC-MS) methods were developed for the analysis of positron emission tomography (PET) radiotracers in biological matrices. Additionally, radiotracer chemistry was explored as an analytical tool for supporting LC-MS method development and imaging molecular interactions in miniaturised chemical analysis systems. READ MORE

5. 3. Gas chromatography and mass spectrometry of polybrominated diphenyl ethers

   Author : Jonas Björklund; Jacob De Boer; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : The aim of this thesis has been to develop accurate and sensitive analytical methods for the determination of polybrominated diphenyl ethers (PBDEs). It focuses on the development and optimization of gas chromatographic and mass spectrometric analysis of PBDE. READ MORE

6. 4. Development of dynamic microwave and sonication-assisted extraction techniques coupled on-line to gas chromatography

   Author : Magnus Ericsson; Tuulia Hyötyläinen; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : This thesis describes the evaluation and construction of two solvent extraction methods for solid samples. The techniques are called Dynamic microwaveassisted extraction (I-III) and Dynamic sonication-assisted solvent extraction (IV-V). Both techniques are based on dynamic solvent extraction and are performed at elevated temperatures and pressures. READ MORE

7. 5. Metabolic Studies with Liquid Separation Coupled to Mass Spectrometry

   Author : Erik Allard; Jonas Berguist; Per Sjöberg; Risto Kostiainen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; liquid chromatography; mass spectrometry; tandem mass spectrometry; method development; capillary electrophoresis; electrospray ionization; time-of-flight; quantitation; metabolomics; metabonomics; pattern recognition; ximelagatran; melagatran; charge state; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : Metabolism is the sum of all chemical processes with the purpose to maintain life, as well as enable reproduction, in a living organism. Through the study of metabolism, increased understanding of pharmacological mechanisms and diseases can be achieved. READ MORE