Essays about: "Solid-phase extraction"

Showing result 1 - 5 of 53 essays containing the words Solid-phase extraction.

  1. 1. Selected PFAS in the water treatment at the waste-to-energy plant in Umeå : Investigating concentration and composition of selected PFAS in different water treatment steps

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Amanda Carlund; [2023]
    Keywords : ;

    Abstract : The present study investigated the changes in concentration and composition of five selected PFAS substances in the water treatment at the waste-to-energy plant in Umeå. The five PFAS were PFHxA, PFHpA, PFOA, PFHxS and PFOS. As PFAS exists in a variety of consumer products, they will to some extent end up in waste incineration. READ MORE

  3. 2. Do selected CF3-containing pharmaceuticals oxidize to trifluoroacetic acid (TFA)? – Analysis of ultra-short perfluoroalkyl acids (PFAAs) and their analytical challenges following oxidation

    University essay from Örebro universitet/Institutionen för naturvetenskap och teknik

    Author : Johanna Gillberg; [2022]
    Keywords : ;

    Abstract : Total oxidizable precursor assay (TOPA) has been used to understand the contribution of unknown precursors to the extractable organofluorine (EOF) compounds. The investigation of compounds containing a CF3 moiety especially connected to an aromatic ring is important because any compounds with such a moiety (pharmaceuticals) may oxidize to form trifluoroacetic acid (TFA). READ MORE

  4. 3. Analysis of non-volatile chemicals from graminoid plants

    University essay from KTH/Kemi

    Author : Jakob Flygar; [2022]
    Keywords : Liquid Chromatography; Cyperus Rotundus; Panicum Repens; Malaria; Mass spectrometry; Vätskekromatografi; Cyperus Rotundus; Panicum Repens; Malaria; Masspektrometri;

    Abstract : Syftet med denna studie var att utveckla en separations- och analysmetod för identifiering av icke-volatila substanser från strån och rötter av de gräsliknande växterna Cyperus rotundus och Panicum repens. För analysen användes högpresterande vätskekromatografi (HPLC) och ultrahögpresterande vätskekromatografi (UHPLC) med en opolär stationär fas (RP-HPLC) med ultraviolett ljus (UV) och elektrosprej masspektrometri detektion (ESI-MS). READ MORE

  5. 4. Occurrence of organic micropollutants and hormones in Swedish surface water

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Malin Forsberg; [2022]
    Keywords : surface water; wastewater; SPE; pharmaceuticals; target analysis; ytvatten; avloppsvatten; SPE; läkemedel; målanalys;

    Abstract : The occurrence and source distribution of organic micropollutants (OMPs) have been investigated in Swedish surface waters, in 23 rivers connected to the lakes Vänern, Vättern and Mälaren, 3 Wastewater treatment plants (WWTPs) and 3 Drinking water plants (DWTPs) located in the middle of Sweden was sampled. Compounds such as pharmaceuticals, industrial chemicals, pesticides, personal care products, hormones, Per- and polyflouroalkyl substances (PFASs), isoflavones, stimulants and parabens were selected. READ MORE

  6. 5. Evaluation of Pre-Analytical Processes on Lipemic Whole Blood Samples Used in Forensic Toxicology

    University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

    Author : Emily Elenstål; [2022]
    Keywords : lipemia; post-mortal; whole blood; benzodiazepines; Intralipid; liquid-liquid extraction; solid-phase extraction;

    Abstract : Introduction: Post-mortem whole blood samples differ greatly in quality, lipemia is one cause of concern in toxicological analyses. Around 4 % of all samples sent to RMV are given a notation of lipemic content. READ MORE