Sökning: "analytical chemistry"

Visar resultat 1 - 5 av 21 uppsatser innehållade orden analytical chemistry.

  1. 1. Occurrence and fate of organic micropollutants (OMPs) in Lake Mälaren

    Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Anna-Lena Rehrl; [2019]
    Nyckelord :multi-residue method; UPLC-MS MS; SPE; organic micropollutants; surface water;

    Sammanfattning : The main objective of this study is to investigate the occurrence and fate of organic micropollutants (OMPs) in surface water in Lake Mälaren over one year, including their seasonal variations, correlations between compounds, spatial and vertical distribution. The water samples were enriched with solid phase extraction (SPE) and subsequently analyzed by ultra-high pressure liq-uid chromatography tandem mass spectrometry (UPLC-MS/MS). LÄS MER

  2. 2. Fyllnadsnivåers påverkan, tidsförlängning innan analys och blodprovers stabilitet

    Kandidat-uppsats, Högskolan i Jönköping/HHJ, Avd. för naturvetenskap och biomedicin; Högskolan i Jönköping/HHJ, Avd. för naturvetenskap och biomedicin

    Författare :Yasmin Chahrour; Helen Ishak; [2018]
    Nyckelord :Pre-analytical factors; Ionized calcium; Standard bicarbonate; Clinical chemistry tests; Post-analytical stability; Pre-analytiska faktorer; Joniserat kalcium; Standardbikarbonat; Kliniskt kemiska analyser; Post-analytisk stabilitet;

    Sammanfattning : Bakgrund: Provmaterial för joniserat kalcium är känsligt för pH-förändringar och med tanke på svårstuckna patienter är det betydelsefullt att undersöka lägre fyllnadsnivåers påverkan på analysresultatet. På grund av olika pre-analytiska faktorer kan tidsgränsen (4 timmar) för analys av standardbikarbonat överskridas. LÄS MER

  3. 3. Conditioning of chromatographic systems prior to metabolomic studies : Investigation of the conditioning effect and the possibility to alter it

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för analytisk farmaceutisk kemi

    Författare :Jasmin Telo; [2017]
    Nyckelord :Analytical chemistry; metabolomics; metabonomics; conditioning; conditioning effect; UPLC; Q-TOF; HILIC; Protein precipitation; Liquid-liquid extraction;

    Sammanfattning : The conditioning effect in metabolomic studies is the phenomenon of initial variation of analytical results in the first 5-10 injections of a biological sample in chromatographic systems. The deviation manifests itself as a drift in retention time, peak area and in multivariate analysis. LÄS MER

  4. 4. Geochemical processes in mine waste subjected to a changing chemical environment: Fe speciation in leachate water from column experiments

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Paula Lundberg; [2017]
    Nyckelord :Sulfidic mine waste; Sulfide oxidation; Water quality; Environmental analytical chemistry; Iron redox speciation;

    Sammanfattning : Oxidation of sulfidic mine waste is of significant environmental concern due to the consequent formation of acid rock drainage (ARD), deteriorating the water quality of natural water systems. Iron (Fe) and sulfur (S) are two major redox elements involved in these reactions and typically the major redox-sensitive elements (whose solubility, speciation, and mobility are affected by pH and Eh) in water affected by ARD. LÄS MER

  5. 5. Photodegradation study of 3,5-diamino-6-chloro- N-(2-(methylamino)ethyl)pyrazine-2-carboxamide using preparative SFC and LC-MS

    Master-uppsats, Uppsala universitet/Institutionen för farmaci

    Författare :Sara Sillén; [2016]
    Nyckelord :photodegradation; UPLC; SFC; liquid chromatography; supercritical fluid chromatography; mass spectrometry; freeze drying; 18O-water; analytical chemistry; structure elucidation; photodegradants;

    Sammanfattning : In this project the photodegradation of 3,5-diamino-6-chloro-N-(2-(methylamino)ethyl)pyrazine-2-carboxamide was studied. A hypothetical degradation pattern for the compound was proposed and the aim of the project was to study the formed secondary photodegradants and to, if possible, structure elucidate some of these compounds. LÄS MER