Sammendrag
In 2016, remediation of contaminated sediments was undertaken in Vikkilen, outside AS Nymo's
harbour area. The capped sediment area was heavily contaminated with polycyclic aromatic
hydrocarbons (PAH) and tributyltin (TBT). On behalf of AS Nymo, NIVA has carried out monitoring of
the effects from the measures taken. In 2018, common periwinkle was investigated for effects that
could be due to exposure to TBT, which is toxic to aquatic organisms and which also has hormone
disruptive effect on snails. Monitoring of pollutants in blue mussels from Vikkilen was also carried
out. The results of the study show that the common periwinkle have no visible signs of effects due to
exposure to TBT. There has been a significant reduction in the concentration of TBT in common
periwinkle in Vikkilen since sediment measures were taken. There has also been a significant
reduction in the concentration of PAH compounds and TBT in blue mussels in Vikkilen from 2016 to
2018. The significant improvement in the concentration of PAH compounds and TBT in blue mussels
shows that the water quality in Vikkilen has improved during the two years since measures were
taken outside AS Nymo.
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