Sökning: "aquatic chemistry"

Visar resultat 11 - 15 av 32 uppsatser innehållade orden aquatic chemistry.

  1. 11. Hydrological catchment analysis from characterisation of organic matter in stream water

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Hannes Berg Wiklund; [2020-02-05]
    Nyckelord :Organic matter; Time-of-flight mass spectrometry; aquatic chemistry; catchment hydrology;

    Sammanfattning : Organic matter (OM) in aquatic systems is a complex field which have rapidly developed during the last decade due to the introduction of high resolution mass spectrometers. The composition of OM in the aquatic environment is directly dependent on factors such as oxygen supply, pH and the flow rate in the local system. LÄS MER

  3. 12. Brunifiering av boreala sjöar och vattendrag : en kunskapsöversikt och analys av trender i vattenkemin hos tre norrländska bäckar

    Kandidat-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Sebastian Carlzon; Andreas Uller; [2020]
    Nyckelord :brunifiering; DOC; Krycklan; dricksvatten;

    Sammanfattning : Brunifiering av ytvatten är idag ett växande problem i många boreala vattensystem. Syftet med studien var att undersöka hur det rådande kunskapsläget ser ut kring brunifiering av ytvatten i boreala sjöar och vattendrag. Studien innefattade även att undersöka bäckar i krycklans avrinningsområde utanför Umeå. LÄS MER

  4. 13. Comparison of two methods in deriving aquatic predicted no-effect concentration (PNEC) for α-Amylcinnamaldehyde, 1-Tridecanol and Paracetamol

    Magister-uppsats, Lunds universitet/Miljövetenskaplig utbildning

    Författare :Emma Holmén; [2019]
    Nyckelord :PNEC; Environmental risk assessment; ERA; α-Amylcinnamaldehyde; 1- tridecanol; paracetamol; Species Sensitivity Distributions; SSD; ECHA; Guidance on information requirements and chemical safety assessment; Earth and Environmental Sciences;

    Sammanfattning : This study is evaluating two methods in order to calculate predicted no effect concentrations (PNECs) used in environmental risk assessment for three chemicals (α-Amylcinnamaldehyde, 1-tridecanol and paracetamol). The methods used are Species Sensitivity Distributions (SSD) and the guideline from European Chemicals Agency (ECHA): “Guidance on information requirements and chemical safety assessment”. LÄS MER

  5. 14. 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

  7. 15. Lake biology as a function of catchment characteristics and water quality parameters – focus on phytoplankton

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

    Författare :Jenny Näslund; [2019]
    Nyckelord :phytoplankton; total phosphorus; catchment; soil properties; land use; agriculture; water framework directive; ecological status;

    Sammanfattning : According to the EU Water Framework Directive, phytoplankton should be included for assessment of the ecological status of lakes. Phytoplankton respond rapidly to environmental changes and are a particularly good indicator of nutrient loads. LÄS MER