Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core - Journal of Geoscience and Environment Protection

GEP > Vol.7 No.8, August 2019

Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core ()

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DOI: 10.4236/gep.2019.78010 578 Downloads 1,455 Views Citations

Author(s)

Masahiro Sakata^1*, Shohei Okuizumi¹, Asami Suzuki Mashio², Takeshi Ohno³, Shuhei Sakata³

Affiliation(s)

¹Graduate Program in Environmental Health Sciences, University of Shizuoka, Shizuoka, Japan.
²Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan.
³Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo, Japan.

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.

KEYWORDS

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

Share and Cite:

Sakata, M. , Okuizumi, S. , Mashio, A. , Ohno, T. and Sakata, S. (2019) Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core. Journal of Geoscience and Environment Protection, 7, 141-154. doi: 10.4236/gep.2019.78010.

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