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Visar resultat 21 - 25 av 56 uppsatser som matchar ovanstående sökkriterier.

  1. 21. Chemical degradation of PFAS using hydrogen peroxide and persulfate

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Jonathan Bannister; [2020]
    Nyckelord :PFOS; PFOA; PFBA; Hydrogen Peroxide; Persulfate; Degradation;

    Sammanfattning : PFAS are a group of relatively newly discovered man-made pollutants. PFAS contains a C-F bond which is one of the strongest bonds in organic chemistry. Therefore, PFAS are not easily degradable and, once release into nature, are very persistent. LÄS MER

  3. 22. Bindning av PFAS-ämnen till humus- och fulvosyror : en dialysstudie

    Kandidat-uppsats, SLU/Dept. of Soil and Environment

    Författare :Johannes Kikuchi; [2020]
    Nyckelord :PFOS; PFOA; sorption; kinetics; dissolved organic matter; natural organic matter; DOC; DOM; membrane;

    Sammanfattning : To make more accurate predictions of the mobility of perfluoroalkyl substances (PFAS) in soil and water, better understanding of PFAS sorption to components of the terrestrial and aquatic systems is needed. This study investigated the possible sorption of a range of PFAS compounds with varying chemistries to humic acid (HA) and fulvic acid (FA) using a dialysis bag experimental set-up. LÄS MER

  4. 23. Total oxidizable precursor assay: Applications and limitations. A study on the occurrence of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in Chinese Wastewater Treatment Plants

    Master-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknik

    Författare :Pontus Larsson; [2020]
    Nyckelord :;

    Sammanfattning : Total oxidizable precursor (TOP) assay is an in-lab method which oxidatively converts precursor compounds of poly- and perfluoroalkyl substances (PFASs) into measurable perfluorinated alkyl acids (PFAAs). The method is a very strong tool to semi-quantify PFASs that would otherwise be missed in conventional targeted analysis using liquid chromatography - tandem mass spectrometry (LC-MS/MS). LÄS MER

  5. 24. Screening of per- and polyfluoroalkyl substances (PFASs) in drinking water in Sweden

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

    Författare :Erik Gunnars; [2020]
    Nyckelord :PFASs; drinking water; per- and polyfluoroalkyl substances; persistent organic pollutants; PFOA; PFOS;

    Sammanfattning : Worldwide use of per- and polyfluoroalkyl substances (PFASs), both legacy and past, are problematic due to their persistent nature. To date, PFASs are of high concern since they have been found not only in the environment but also in animals, plants and humans. LÄS MER

  7. 25. Method development for the analysis of PFAS and neutral precursors in active and passive air samplers

    Master-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknik

    Författare :Pascal Camoiras González; [2019]
    Nyckelord :;

    Sammanfattning : Poly- and perfluoroalkyl substances (PFAS) are a chemical class of global concern because of their persistence, toxicity and widespread presence in the environment. This work aimed to develop a robust and reliable method to analyse perfluorohexane sulfonic acid (PFHxS), perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), as well as the neutral volatile PFOS precursors, namely perfluorooctane sulfonamides and perfluorooctane sulfonamidoethanols (FOSAs/FOSEs). LÄS MER