Search for dissertations about: "headspace sampling"

Showing result 1 - 5 of 6 swedish dissertations containing the words headspace sampling.

2. 1. Biodegradation of hydrocarbons in soil and water

   Author : Mikael Eriksson; KTH; []
   Keywords : Solid Phase Microextraction; SPME; biodegradation; bioremediation; bioavailability; monitoring; Volatile Organic Compounds VOC ; Screening; headspace sampling; polycyclic aromatic hydrocarbons; PAHs; aliphatic hydrocarbons; total petroleum hydrocarb;

   Abstract : Biodegradation of aliphatic and polycyclic aromatichydrocarbons was studied in soil and liquid cultures attemperatures ranging from -5 º C to 20 º C undervarious aerobic or anaerobic, nitrate reducing, conditions. Twocontaminated soils were used in the studies. READ MORE

4. 2. Determination of benzene in urine and breath for monitoring of benzene exposure

   Author : Göran Ljungkvist; Göteborgs universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Biological monitoring; benzene; breath; urine; dynamic headspace; membrane; gas chromatography; mass spectrometry; thermal desorption;

   Abstract : The aim of this work was to develop and validate methods for determination of unmetabolized benzene in breath and urine. The methods were intended for the bio monitoring of benzene to assess both occupational and environmental exposure.A method was developed for the determination of benzene in end-exhaled air. READ MORE

5. 3. Sample preparation and analysis of metabolites from plants in the families of Cyperaceae, Poaceae and Apiaceae

   Author : Linus Svenberg; Åsa Emmer; Jenny Lindh; Margareta Sandahl; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Gas chromatography; Mass spectrometry; Ultrasound assisted extraction; Solid-phase microextraction; Volatile compounds; Allelopathy; Bioassay; Gaskromatografi; Masspektrometri; Ultraljudsassisterad extraktion; fastfas-mikroextraktion; Flyktiga ämnen; Allelopati; Bioanalys; Kemi; Chemistry;

   Abstract : An important aspect of understanding how plants effect their environmentis the study of volatile compounds and how these influence interactions between plants and other living organisms. The study of these secondary metabolites from plants can be used in practical applications, such as behaviour control of insects, and is an important part in the search for novel compounds that can be used to influence the behaviour of disease spreading vectors. READ MORE

6. 4. Solid-Phase Microextraction in Polymer Analysis - Extraction of Volatiles from Virgin and Recycled Polyamide 6.6

   Author : Mikael Gröning; Minna Hakkarainen; Stephen Kelley; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; polymer; polyamide 6.6; volatiles; emissions; degradation; quantitation; Kemi; Chemistry; Kemi;

   Abstract : The extraction and quantitative analysis of low molar mass compounds in polymers is an analytical challenge. It is also important from a practical point of view because the low molar mass compounds in time will migrate from the polymers into the surrounding environment. READ MORE

7. 5. Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance

   Author : Lina Burman; Ann-Christine Albertsson; Marek Kowalczuk; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; polymer; chromatographic fingerprinting; gas-chromatography – mass spectrometry; GC-MS; degradable polyethylene; prooxidant systems; chemiluminescence; oxidation; degradation mechanisms; accelerated ageing; antioxidants; transformation products; microwave assisted extraction; MAE; solid-phase microextraction; SPME; volatiles; solid phase extraction; SPE; Kemiteknik; Chemical engineering; Kemiteknik;

   Abstract : Chromatography and extraction techniques, and also chemiluminescence have been utilized to develop new rapid and informative tools in the evaluation of long-term properties and environmental effects of polymeric materials. Methods were developed for classification of materials and for early and rapid degradation detection. READ MORE