Search for dissertations about: "Extraktionsteknik"

Found 5 swedish dissertations containing the word Extraktionsteknik.

2. 1. Uptake and bioaccumulation of ionizable pharmaceuticals in aquatic organisms

   Author : Marja L. Boström; Enhet akvatisk ekologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Antidepressiva medel; Avloppsvatten; BAF; BCF; Bioackumulation; Biokoncentration; Biomagnifikation; CYP; Extraktionsteknik; HF-LPME; Joniserbara läkemedel; Metabolism; pH; Riskanalys; Tolerans; Antidepressant; BAF; BCF; Bioaccumulation; Bioconcentration; Biomagnification; CYP; Extraction technique; HF-LPME; Ionizable pharmaceutical; Metabolism; pH; Risk assessment; Tolerance; Wastewater;

   Abstract : Pharmaceuticals are found at low concentrations (ng/L) in aquatic environments but bioaccumulation may result in aquatic organisms reaching internal effect levels (µg/L). Environmental hazard assessments include standardized bioaccumulation tests but contrary to the model substances around which the frameworks are built most pharmaceuticals are designed to mimic endogenic chemicals, ionizable, and less lipophilic. READ MORE

4. 2. On-line Sample Pretreatment Based on Membrane Enrichment, Mainly Using Supported Liquid Membranes, for Chromatographic Analysis

   Author : Yin Shen; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biological Sample; Environmental Sample; Capillary Gas Chromatography; Ion Chromatography; Automation; Sample Pretreatment; Enrichment; Membrane; Extraction; Analytical chemistry; Analytisk kemi;

   Abstract : The main objective of this work was to construct practical analytical systems for the analysis of environmental and biological samples, using membrane-based techniques for sample pretreatment and chromatography for final analysis. Two types of membrane processes have been applied, with emphasis on automation. READ MORE

5. 3. Recent Extraction Techniques with Emphasis on Supercritical Fluid Extraction and Microwave-assisted Extraction

   Author : Cecilia Sparr Eskilsson; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; Pressurized hot water extraction; Pressurized liquid extraction; Microwave-assisted extraction; Recent extraction techniques; Supercritical fluid extraction;

   Abstract : Today’s requirements of fast, reliable and selective analytical methods with minimal usage of organic solvents have accelerated the development of new, automated extraction techniques. In this thesis recent extraction techniques with emphasis on supercritical fluid extraction (SFE) and microwave-assisted extraction (MAE) were investigated. READ MORE

6. 4. Evaluations of Non-metallic Inclusionsin Ca-treated Steels and Their Effect on the Machinability

   Author : Hongying Du; Andrey Karasev; Pär Jönsson; Lauri Holappa; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-metallic inclusions; Ca treatment; stainless steel; machinability.; icke-metalliska inneslutningar; kalciumbehandling; rostfritt stål; skärbarhet.; Teknisk materialvetenskap; Materials Science and Engineering;

   Abstract : In recent decades, a considerable development of steel with respect to the performance of steel has taken place, which also has resulted in large challenges to process these steel grades. Therefore, it is essential to make suitable modifications of non-metallic inclusions (NMI) in the steelmaking process and to have a good control of its characteristics to meet the target mechanical properties and to obtain a good machinability. READ MORE

7. 5. Extraction of PCBs from Sediments: Towards Bioavailability Assessment Based on Supercritical Fluid Extraction

   Author : Tobias Nilsson; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; Bioavailability; PCB; SFE;

   Abstract : Persistent organic pollutants (POPs) pose serious threats to our global environment. These compounds have high chemical and biological stability and they are also very lipophilic. READ MORE