Abstract

Mercury concentrations were measured in sediment cores collected from the Yatsushiro Sea to clarify physical transport of mercury from Minamata, the site of major methylmercury pollution in Japan, to the surrounding sea. The results suggested that the mercury pollution in the Yatsushiro Sea sediment was caused by a slow migration of mercury-bearing sediment particles from Minamata Bay. The deposition rate of mercury observed at the Yatsushiro Sea was correlated with cumulative loss of mercury from an acetaldehyde facility in Chisso Minamata, with a certain time-lag.

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