Browsing NTNU Open by Author "Ndungu, Kuria"

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    • Arctic Ocean’s wintertime mercury concentrations limited by seasonal loss on the shelf 

      Kohler, Stephen Gustav; Heimbürger-Boavida, Lars-Eric; Petrova, Mariia V.; Digernes, Maria Guadalupe; Sanchez, Nicolas; Dufour, Aurelie; Simic, Anica; Ndungu, Kuria; Ardelan, Murat Van (Peer reviewed; Journal article, 2022)
      High biota mercury levels are persisting in the Arctic, threatening ecosystem and human health. The Arctic Ocean receives large pulsed mercury inputs from rivers and the atmosphere. Yet the fate of those inputs and possible ...

    • Biotic transformation of methylmercury at the onset of the Arctic spring bloom 

      Kohler, Stephen Gustav; Heimbürger-Boavida, Lars-Eric; Assmy, Philipp Kurt Wolf; Müller, Oliver; Thiele, Stefan; Digernes, Maria Guadalupe; Ndungu, Kuria; Ardelan, Murat van (Journal article; Peer reviewed, 2024)
      Despite the lack of local anthropogenic mercury sources, methylated mercury (MeHg) concentrations in Arctic biota are higher than in biota from lower latitudes. The main entry route occurs during the bioconcentration of ...

    • Distribution pattern of mercury in northern Barents Sea and Eurasian Basin surface sediment 

      Kohler, Stephen Gustav; Kull, Laura M.; Heimbürger-Boavida, Lars-Eric; Ricardo de Freitas, Thaise; Sanchez, Nicolas; Ndungu, Kuria; Ardelan, Murat Van (Peer reviewed; Journal article, 2022)
      Marine sediment is a significant sink for the global pollutant mercury. In a rapidly changing Arctic region, mercury (Hg) bioaccumulation in the marine ecosystem remains a prominent environmental issue. Here, we report ...

    • Lithium Extraction from Seawater Brine; Investigating a Frugal Method that could be easily Implemented in Developing Countries 

      Torseth, Aase Mari (Master thesis, 2022)
      Behovet for litium (Li) øker i takt med det økende behovet for energilagring og blir nærmer seg p bli en forsyningsrisiko. I tillegg er effekten av utløpet av saltlaken fra ferskvannsindustrien et økende problem som kan ...

    • Seasonal biogeochemical cycling of mercury on the Arctic Ocean shelf 

      Kohler, Stephen G. (Doctoral theses at NTNU;2023:286, Doctoral thesis, 2023)
      The toxic pollutant mercury accumulates in marine food webs on a global scale, with consumption of seafood as the primary exposure pathway for humans. Since 2017, the Minamata Convention on Mercury has aimed to reduce human ...