residue levels of the chlorinated hydrocarbons polychlorinated biphenyls ( pcbs ) , total ddt , alpha- , beta- and gamma-hexachlorocyclohexane ( hch ) , hexachlorobenzene ( hcb ) , and oxychlordane in blubber , and the elements mercury , cadmium , copper , selenium , arsenic , and zinc in liver , of 82 harbour seals , phoca vitulina , were determined .
C0020247
chlorinated hydrocarbons
C0005038
gamma-hexachlorocyclohexane