東京湾における水銀の地球化学 [in Japanese] Mercury geochemistry in the Tokyo Bay [in Japanese]
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Levels of total mercury were surveyed in the Tokyo Bay. The mercury concentration in the Tokyo Bay water is 9.7ng/l in average. This value is two times the open ocean water value. The mercury content in the surfical sediments range 100 to 800 ppb which exceed the natural value of 50 ppb in the Tokyo Bay sediments. We show that the mercury increment in the Tokyo Bay started at 1900, showed sharp rise after 1950 and reached the maximum around 1970. The residence time of mercury in the bay water is estimated to be 28 days. This short residence time for mercury compared to the bay water residence time of 47 days indicates the removal of mercury from the water is rapid.
Chikyukagaku 17(1), 48-52, 1983
The Geochemical Society of Japan