AS, SR, ZN, FE, MN, PB AND CU CONCENTRATIONS OF SEAWEED AT THE KII PENINSULA, JAPAN
Keywords:Seaweed, heavy metal, mine waste, Kii Penisula, Kanayama Bay
Seaweed from locations ranging from Osaka Bay facing the metropolis to the southern top of
the Kii Peninsula facing the Kuroshio Current at the Kii Peninsula were measured for concentrations of arsenic
(As), strontium (Sr), zinc (Zn), iron (Fe), manganese (Mn), lead (Pb) and copper (Cu). Except for one location
at Kanayama neighboring a closed Pb mine, metal concentrations in seaweed were variable but their average
values agreed with the world data. Therefore the influence of the Kuroshio Current water and Osaka Bay water
on metal concentration in seaweed was found to be small. As and Sr concentrations in brown seaweed were
higher than those in red and green seaweed at the Kii peninsula except at Kanayama, Fe concentrations in
green seaweed were higher than those in brown and red seaweed and Zn, Mn, Pb and Cu concentrations in
brown, red and green seaweed were all the same. Total Fe, Zn, Mn, Pb and Cu loads of mine waste water from
the closed mine into the Kanayama Bay were 4,000 to 6,000, 3,000 to 5,000, 180, 20 and several kg per year.
Zn and Fe concentrations in seaweed at Kanayama were remarkably high being 10 to 100 times that of the
world value. Mn and Pb concentrations in seaweed at Kanayama were 10 times higher than the world values.
Cu concentrations of red and green seaweeds at Kanayama were little higher than the world values.