Sökning: "UPLC-MS MS"

Visar resultat 11 - 15 av 26 uppsatser innehållade orden UPLC-MS MS.

1. 11. 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

3. 12. Occurrence of per- and polyfluorinated alkyl substances (PFAS), including ultra-short-chain compounds. Seasonal variation in rainwater from the Swedish west coast

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

   Författare :Felicia Jansson; [2019]
   Nyckelord :PFAS; rainwater; ultra-short chain PFAS; atmospheric transport; wet deposition;

   Sammanfattning : Per- and polyfluoroalkyl substances (PFAS) are a group of highly fluorinated compounds which comprises of more than 4700 substances. A smaller number of those substances is rou-tinely measured, usually the short (C4-C7) and long chain PFAS (>C7). LÄS MER

4. 13. A study to understand the information gap between total organofluorine analysis and total oxidizable precursor assay on polyfluoroalkyl/perfluoroalkyl substances (PFASs)

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

   Författare :Pontus Larsson; [2018]
   Nyckelord :;

   Sammanfattning : Total oxidizable precursor (TOP) assay is an oxidation method to convert precursor compound of polyfluoroalkyl/perfluoroalkyl substances (PFASs) into measurable perfluorinated carboxylic acids (PFCAs). A previous mass balance study has shown that a loss of fluorine was observed after employing the method to convert the precursors in firefighting foams. LÄS MER

5. 14. An assessment of thermal desorption as a remediation technique for per- and polyfluoroalkyl substances (PFASs) in contaminated soil

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Anna-Stina Lind; [2018]
   Nyckelord :Thermal desorption; per- and polyfluoroalkyl substances; PFASs; PFBA; PFPeA; PFHxA; PFHpA; PFOA; PFNA; PFDA; PFUnDA; PFBS; PFHxS; PFOS; 6:2 FTSA; 8:2 FTSA; FOSA; PCB; PAH; UPLC MS MS; Termisk rening; Per- och polyfluoralkylsubstanser; PFASs; PFBA; PFPeA; PFHxA; PFHpA; PFOA; PFNA; PFDA; PFUnDA; PFBS; PFHxS; PFOS; 6:2 FTSA; 8:2 FTSA; FOSA; PCB; PAH; UPLC MS MS;

   Sammanfattning : Per- and polyfluoroalkyl substances (PFASs) are a diverse group of persistent organic pollutants. PFASs have a wide area of applications such as stain repellent for paper, textile, furniture and industrial products such as aqueous film forming foams (AFFFs) used for firefighting. LÄS MER

7. 15. Microbial binding of per- and polyfluorinated alkyl substances (PFASs) : - Analysis of PFASs in microbes with ultra-performance liquid chromatography – tandem mass spectrometry (UPLC-MS/MS)

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

   Författare :Karolina Majdak; [2018]
   Nyckelord :PFASs; microbes; microbial binding; PFOS; PFHxS; AFFFs.;

   Sammanfattning : Per- and polyfluorinated alkyl substances (PFASs) belong to a large group of man-made chemicals that pollute the environment. Perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) are the most commonly found PFASs. The pollution of PFASs can be caused among others by using of aqueous fire-fighting foams (AFFFs). LÄS MER