Sökning: "anion exchange"

Visar resultat 1 - 5 av 27 uppsatser innehållade orden anion exchange.

  1. 1. Arsenite removal from contaminated water by different sorbent materials

    Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

    Författare :Kaijie Ding; [2020]
    Nyckelord :Arsenic contamination; adsorption; hydrotalcite; Mg−Al layered double hydroxide; amorphous aluminium hydroxide; amorphous titanium oxide; adsorption isotherm; co-existing anions;

    Sammanfattning : Arsenic (As) contamination is a worldwide problem, and millions of people are suffering from it. There are two major inorganic forms of As in waters: arsenate(V) and arsenite(III), and adsorption to a sorbent material may be an efficient method to handle them. LÄS MER

  2. 2. 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

  3. 3. 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

  4. 4. Optimizing purification of oligonucleotides with reversed phase trityl-on solid phase extraction

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

    Författare :Ninorta Bartuma; [2019]
    Nyckelord :Oligonucleotides; purification; trityl-on; SPE; AIE-HPLC;

    Sammanfattning : Oligonucleotides are synthetic strings of DNA or RNA used mostly for biochemical analysis and diagnostics. For them to be useful in these fields, a purity over 90% is most often required. However, when synthesizing these sequences, many “failures” (shorter sequences) are made in the step-wise process. LÄS MER

  5. 5. Electrodialytic Remediation of PFAS-Contaminated Soil

    Master-uppsats, KTH/Vatten- och miljöteknik

    Författare :Georgios Niarchos; [2018]
    Nyckelord :Per- and polyfluoroalkyl substances; Electrokinetic; Ground; Groundwater; Treatment; Electrochemistry; Environment; Per- och polyfluoralkylsubstanser; Electrokinetisk; Grundvatten; Förorening; Elektrokemi; Miljö;

    Sammanfattning : Per- and polyfluoroalkyl substances (PFASs) are a group of anthropogenic aliphatic compounds, widelyknown for their environmental persistence and toxicity to living beings. While they are ubiquitous in theenvironment, interest has been focused on contaminated soil, which can act as a primary recipient andsource of groundwater contamination. LÄS MER