Sökning: "PFOA"

Visar resultat 1 - 5 av 31 uppsatser innehållade ordet PFOA.

  1. 1. 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

  2. 2. Binding of per- and polyfluoroalkyl substances (PFASs) to organic soil horizons of peat and mor : effect of solution chemistry and soil organic matter composition

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

    Författare :Jennifer Makselon; [2019]
    Nyckelord :sorption; electrostatic interactions; isotherms; partitioning coefficient; soil organic matter; cation; PFOS; PFOA; desorption;

    Sammanfattning : The understanding of sorption processes of per- and polyfluoroalkyl substances (PFASs) in soils is important for the determination of their fate and transport in the environment. The sorption behavior of PFASs of varying chain length and hydrophilic headgroup was studied in three organic soils, two peat soils and one mor layer, with differing chemical composition of the soil organic matter (SOM). LÄS MER

  3. 3. Perfluorooctane sulfonate (PFOS) and related chemicals in eggs from Sweden and China

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

    Författare :Yasmin Karimi; [2019]
    Nyckelord :PFOS; PFOA; Chicken Egg; LC-MS MS; Organic egg; Conventional egg;

    Sammanfattning : Dietary intake is one of the major routes of human exposure to perfluoroalkyl and/or polyfluoroalkyl substances (PFAS). The objective of this study was to measure perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS) in organic and conventional egg from Sweden (n=8, consisted of 4 pooled eggs and 4 individuals) and China (n=9, consisted of 4 pooled eggs and 5 individuals) and compare the concentrations of PFAS between the two categories (organic and conventional). LÄS MER

  4. 4. Trace level analyses of selected perfluoroalkyl substancesin food: Method development and validation

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

    Författare :Mohammad Sadia; [2019]
    Nyckelord :;

    Sammanfattning : To comprise the future requirements to detect low levels of perfluoroalkane acids, includingbranched and linear perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA),and perfluorohexane sulfonic acid (PFHxS) in food items, here analytical methods fordetermination of PFOS, PFOA and PFHxS in six different food matrices (cow milk, butter,chicken egg, chicken meat, beef, and fish) were optimized and validated. The optimizedmethod was based on alkaline digestion and solid-liquid extraction using acetonitrile,followed by solid phase extraction (SPE) using a weak anion exchange cartridge as clean-up. LÄS MER

  5. 5. Nutidsbeskrivning av PFAS i dagvatten för området Frösö Park : Med fokus mot reningsmetoder och hur PFAS-situationen ser ut för framtiden

    Master-uppsats, Karlstads universitet

    Författare :Tore Johansson; [2019]
    Nyckelord :Urban runoff; PFOA; PFOS; Purification methods;

    Sammanfattning : PFAS is a relatively new group of contaminants with unique characteristics, which in the early 21st century was understood being dangerous for both humans and the environment. In 2008, EFSA published a report on guidelines for human intake of PFAS. LÄS MER