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has been cited by the following article:

• TITLE: Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core

  AUTHORS: Masahiro Sakata, Shohei Okuizumi, Asami Suzuki Mashio, Takeshi Ohno, Shuhei Sakata

  KEYWORDS: Zinc, Pollution Sources, Sediment Core, Zinc Isotope Ratio, Tokyo Bay

  JOURNAL NAME: Journal of Geoscience and Environment Protection, Vol.7 No.8, August 19, 2019

  ABSTRACT: This study evaluated the sources of Zn pollution in Tokyo Bay, Japan, on the basis of δ66Zn in a sediment core. The Zn concentration in sediments in the 1980s-2000s was considerably higher than the background concentration, suggesting that there remain important sources of Zn in the bay. The δ66Zn (+0.51‰) of anthropogenic Zn estimated in the core was significantly higher than those (approximately –0.1‰ - +0.2‰) of treated water from sewage treatment plants and vehicle-related sources. A large number of electroplating plants are located in Tokyo areas. It is assumed that Zn in effluents from electroplating operations is isotopically heavier owing to a negative isotopic effect on Zn electroplating. This tends to support the hypothesis that river bottom sediments, which were contaminated with Zn in the untreated effluents from electroplating plants in the past, are the principal sources of anthropogenic Zn in Tokyo Bay in the 1980s-2000s.