the concentration of heavy metals ( cobalt , nickel , copper , cadmium , mercury and lead ) , which are present at trace levels in the edible part of mussels ( mytilus galloprovincialis lamarck ) from hatcheries in the gulf of trieste , is normally or log-normally distributed , according to a statistical test sensitive to asymmetry of the distribution .
C0347988
heavy metals
C0009148
cobalt