Sökning: "humic matter"

Visar resultat 1 - 5 av 18 uppsatser innehållade orden humic matter.

  1. 1. Water quality and organic matter linkages in waters draining arable fields

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

    Författare :Adam Eriksson; [2021]
    Nyckelord :Natural organic matter NOM ; particular organic matter POM ; dissolved organic matter DOM ; allochthonous; autochthonous; Florescence index FIX ; Freshness index BIX ; Humification index HIX ; SUVA 254; E2:E3; Spectral Slope; Observation fields; microbial matter; humic matter; unfiltered samples UF ; filtered samples F45 ;

    Sammanfattning : This study investigated leaching of natural organic matter (NOM) in twelve Swedish arable fields with regards to the quality of dissolved organic matter (DOM) and particulate organic matter (POM), using Absorbance (UV-Vis) and fluorescence spectrometry (EEM). DOM is defined as organic matter (OM) 0.45 μm. LÄS MER

  3. 2. Optimisation of a small-scale ultrafiltration system for separation of humic substances from surface water

    Master-uppsats, KTH/Kemiteknik

    Författare :Nadia Nikzad; [2021]
    Nyckelord :Ultrafiltration; online-coagulation; pH; reaction time; coagulant dosage; NOM; humic substances; Ultrafiltrering; online-koagulation; pH; reaktionstid; koaguleringsdos; NOM; humusämnen;

    Sammanfattning : Norrvatten är den fjärde största dricksvattenproducenten i Sverige. De producerar och distribuerar dricksvatten till 14 kommuner norr om Stockholm. Norrvatten har under en tid studerat alternativa processer för att optimera och öka produktionskapaciteten och effektiviteten i deras dricksvattenreningsverk vid Görvälnverket. LÄS MER

  4. 3. Analysing the controls over DOM quality in two contrasting sub polar marine environments

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Chiara Monforte; [2020]
    Nyckelord :DOM optical properties; Absorbance; Fluorescence; EEMs; Burdwood Bank; Beagle Channel; Earth and Environmental Sciences;

    Sammanfattning : In this study, Dissolved Organic Matter (DOM) quality was analysed through its optical properties. Samples from the estuarine waters of the Beagle Channel and oceanic ones of the Burdwood Bank were examined in order to understand how DOM quality was changing. LÄS MER

  5. 4. Photo-chemical reactivity of dissolved organic carbon in subarctic lakes from northern Sweden

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Hani Younes; [2020]
    Nyckelord :Photo-reactivity; DOM; subarctic lakes; EEM-PARAFAC. Brownification; Earth and Environmental Sciences;

    Sammanfattning : Dissolved organic matter (DOM) is the major absorber of sunlight in most natural waters and a critical component of the carbon cycle in aquatic systems. The photochemical decomposition of DOM can have a significant impact on the landscape-atmosphere carbon exchange. LÄS MER

  7. 5. 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