• Biological intercalibration. Invertebrates 1915 - ICP Waters report 124/2015 

      Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;6940, Research report, 2015)
      Six European laboratories participated in the 19th ICP Waters biological intercalibration, which took place in 2015. The laboratories identified a very high portion of the individuals in the test samples, > 95% of the total ...
    • Biological intercalibration: Invertebrates 1713 (ICP Waters report 118/2014) 

      Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik; de Wit, Heleen (NIVA-rapport;6662, Research report, 2014-04)
      The 17th intercalibration of invertebrates in the ICP Waters programme had contribution from four laboratories. The laboratories identified a very high portion of the individuals in the test samples, usually > 95% of the ...
    • Biological intercalibration: Invertebrates 1814 

      Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;6761, Research report, 2014)
      The 18th intercalibration of invertebrates in the ICP Waters programme had contribution from three laboratories. The laboratories identified a very high portion of the individuals in the test samples, > 95% of the total ...
    • Mechanisms for metal nodule formation on sediment surfaces of limed lakes 

      Hindar, Atle; Couture, Raoul-Marie; Eriksen, Tor Erik; Rognerud, Sigurd (NIVA-rapport;6875, Research report, 2015)
      The water chemical and biological effects of liming have been fairly well documented. One of the research projects revealed relatively large (up to 1-3 cm in diameter) metal nodules on the sediment surface of some of the ...