Blar i Publikasjoner fra Cristin - NIVA på forfatter "Ndungu, Kuria"

Viser treff 1-12 av 12

    • A mesocosm experiment on methyl mercury formation after cappingof U-864 sediments enriched with powdered algae 

      Ndungu, Kuria; Schaanning, Morten (NIVA-rapport;6867, Research report, 2015)
      A mesocosm experiment was performed on methylation of mercury in marine sediments from the wreck site at Fedje. The mercury contaminated sediment was enriched with zero, low, medium or high dose of labile organic carbon ...

    • 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 ...

    • Benthic community status and mobilization of Ni, Cu and Co at abandoned sea deposits for mine tailings in SW Norway 

      Schaanning, Morten Thorne; Trannum, Hilde Cecilie; Øxnevad, Sigurd; Ndungu, Kuria (Journal article; Peer reviewed, 2019)
      During 1960–94 tailings from an ilmenite mine in southwest Norway were placed in sea deposits in a sheltered fjord and a more exposed coastal basin. In 2015 both deposit sites were sampled to assess the state of metal ...

    • Beslutningsgrunnlag og tiltaksplan for forurensede sedimenter i Gunneklevfjorden. Delrapport fra Aktivitet 4.Biotilgjengelighet av kvikksølv og dioksiner i sedimenter og effekter av behandling med aktivt kull 

      Schaanning, Morten; Olsen, Marianne; Ndungu, Kuria (NIVA-rapport;6796, Research report, 2015)
      Denne rapporten beskriver 1)sedimentmiljøet i Gunneklevfjorden målt med elektroder, 2) målinger av utlekking og bioakkumulering av kvikksølv, metylkvikksølv og klororganiske forbindelser (HCB, OCS og PCDD/F) og 3)effekter ...

    • 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 ...

    • Effects of organic matter addition on methylmercury formation in capped and uncapped marine sediments 

      Ndungu, Kuria; Schaanning, Morten; Braaten, Hans Fredrik Veiteberg (Journal article; Peer reviewed, 2016)
      In situ subaqueous capping (ISC) of contaminated marine sediments is frequently proposed as a feasible and effective mitigation option. However, though effective in isolating mercury species migration into overlying water, ...

    • Forekomst og utslipp av seksverdig krom i sigevann fra Deponi 2.1 ved Glencore Manganese Norway AS, Mo i Rana 

      Vogelsang, Christian; Tobiesen, August E.Dessen; Ndungu, Kuria; Beyer, Jonny (NIVA-rapport;6949, Research report, 2016)
      NIVA har gjennomført en kritisk gjennomgang og miljøfaglig vurdering av størrelsene, årsakene og mulige miljøkonsekvenser av utslipp av seksverdig krom fra Glencore Manganese Norway AS sitt Deponi 2.1 ved Mo Industripark ...

    • Interlaboratory Comparison of Extractable Organofluorine Measurements in Groundwater and Eel (Anguilla rostrata): Recommendations for Methods Standardization 

      Ruyle, Bridger J.; Pickard, Heidi M.; Schultes, Lara; Fredriksson, Felicia; Heffernan, Amy L.; Knappe, Detlef R. U.; Lord, Heather L.; Meng, Pingping; Mills, Marc A.; Ndungu, Kuria; Roesch, Philipp; Rundberget, Thomas; Tettenhorst, Daniel R.; Van Buren, Jean; Vogel, Christian; Westerman, Danielle C.; Yeung, Leo W. Y.; Sunderland, Elsie M. (Peer reviewed; Journal article, 2023)
      Research on per- and polyfluoroalkyl substances (PFAS) frequently incorporates organofluorine measurements, particularly because they could support a class-based approach to regulation. However, standardized methods for ...

    • Lead Sources to the Amundsen Sea, West Antarctica 

      Ndungu, Kuria; Zurbrick, Cheryl M; Stammerjohn, Sharon; Severmann, Silke; Sherrell, Robert M; Flegal, A. Russel (Journal article; Peer reviewed, 2016)
      The global prevalence of industrial lead (Pb) contamination was exemplified decades ago by the predominance of anthropogenic Pb in samples of Antarctic surface ice and in Southern Ocean surface waters. Decreases in ...

    • Petroleum oil and mercury pollution from shipwrecks in Norwegian coastal waters 

      Ndungu, Kuria; Beylich, Bjørnar; Staalstrøm, Andre; Øxnevad, Sigurd; Berge, John A; Braaten, Hans Fredrik Veiteberg; Schaanning, Morten; Bergstrøm, Rune (Journal article; Peer reviewed, 2017)
      Worldwide there are tens of thousands of sunken shipwrecks lying on the coastal seabed. These potentially polluting wrecks (PPW) are estimated to hold 3–25 million t of oil. Other hazardous cargo in PPW includes ordnance, ...

    • Pharmaceuticals and their metabolites in the marine environment: Sources, analytical methods and occurrence 

      Madikizela, Lawrence Mzukisi; Ncube, Somandla; Tutu, Hlanganani; Richards, Heidi; Newman, Brent; Ndungu, Kuria; Chimuka, Luke (Peer reviewed; Journal article, 2020)
      The occurrence of pharmaceuticals in the environmental waters is a global concern. There is little research conducted on the monitoring of pharmaceuticals in the marine environment. In this article, the occurrence of ...

    • Screening Programme 2021 

      Schlabach, Martin; van Bavel, Bert; Bæk, Kine; Dadkhah, Mona Eftekhar; Gabrielsen, Geir W.; Nikiforov, Vladimir; Bohlin-Nizzetto, Pernilla; Reid, Malcolm James; Rostkowski, Pawel; Rundberget, Thomas; Ndungu, Kuria; Rødland, Elisabeth Strandbråten; Schmidbauer, Norbert; Harju, Michael; Beylich, Bjørnar; Vogelsang, Christian (NIVA-rapport;7765-2022, Research report, 2022)
      The Screening Programme 2021 was carried out by the Norwegian Institute for Water Research (NIVA) and NILU-Norwegian Institute for Air Research. The spotlight was placed on the occurrence and possible environmental problems ...