Abstract
The heavy metals pollution sources of sediments in Ohtake Coastal area have been studied using sediment cores, where industrialization begins after 1935 yr and chemical fiber, pulp and petroleum chemical factories are located today.
The elements of high concentrations in sediments were correlated with using chemicals contained themselves or contaminated from them in factories. The vertical and horizontal profiles of the heavy metals concentrations were reflected the stages of industrialization of the sampling site.
Mercury concentration in 0-5 cm was lower than in 50-55 cm layer at the factory near site. This phenomenon was different from other element. It may be the result by markedly decreasing of Hg contained in caustic soda as impurity since 1967.
A petroleum chemical factory had used Mn, but the concentration did not increased. As Mn solubility increase in reductive conditions and this investigation area was reported to polluted by organic matters, Mn in sediments assumed to transfer into water layer for the formation of Mn2+ ions.
