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

Sakata, Masahiro; Okuizumi, Shohei; Mashio, Asami S.; Ohno, Takeshi; Sakata, Shuhei

doi:10.4236/gep.2019.78010

Cited by 6 publications

(10 citation statements)

References 31 publications

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“…Furthermore, the reduction in untreated domestic wastewater (+ 0.28 ± 0.02‰, n = 1, Chen et al 2008) and of industrial effluents, and the contribution of water from wastewater treatment plants (WWTPs; + 0.05‰ to + 0.11‰) (Chen et al 2008;Desaulty and Petelet-Giraud 2020;Sakata et al 2019) from the early 1970s did not have a significant effect on the δ 66 Zn values until around 1990. The constant δ 66 Zn values could be due to similar δ 66 Zn values of anthropogenic sources and/or the contribution of contaminated river sediments and runoff from industrial and urban areas (Andronikov et al 2021).…”

Section: Zinc Stable Isotopes As Tracer For Zn Contaminationmentioning

confidence: 94%

“…Often, the δ 66 Zn values of the resulting Zn (by)products differ from that of the Upper Continental Crust (UCC; + 0.28 ± 0.05 ‰, 2σ) (Chen et al 2013). Typical contemporary anthropogenic materials with low δ 66 Zn values are road dust (+ 0.08 ‰ to + 0.17 ‰) and tire wear (+ 0.08 ‰ to + 0.21 ‰) (Dong et al 2017;Souto-Oliveira et al 2018;Thapalia et al 2010), and industrial waters and effluents from wastewater treatment plants (− 0.03 ‰ to + 0.15 ‰) (Chen et al 2008;Desaulty and Petelet-Giraud 2020;Sakata et al 2019). Anthropogenic materials with high δ 66 Zn values are slags and effluents from smelters (up to + 1.5 ‰) (Juillot et al 2011;Sivry et al 2008) and Zn in electroplating wastes after electrochemical reduction (up to + 3.5 ‰) (Kavner et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Anthropogenic materials with high δ 66 Zn values are slags and effluents from smelters (up to + 1.5 ‰) (Juillot et al 2011;Sivry et al 2008) and Zn in electroplating wastes after electrochemical reduction (up to + 3.5 ‰) (Kavner et al 2008). As such, combining δ 66 Zn values with changes in Zn concentrations has become a popular tool for tracing anthropogenic Zn in sediment cores from coastal areas throughout the Anthropocene time (Araújo et al 2017(Araújo et al , 2019aSakata et al 2019;Tonhá et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, we compare the historical trace metal contamination with sediment cores from other sites in the Seto Inland Sea, and we assess potential toxic effects on marine biota. Sakata et al (2019) suggested the contribution of Zn discharged from electroplating plants led to increasing δ 66 Zn values in a core from Tokyo Bay from the early 1950s. Such a pattern may also exist for Osaka Bay.…”

Section: Introductionmentioning

confidence: 99%

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Metal contamination in a sediment core from Osaka Bay during the last 400 years

Nitzsche

Yoshimura

Ishikawa

et al. 2022

Prog Earth Planet Sci

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Osaka Bay adjacent to the Kyoto–Osaka–Kobe metropolitan area was affected by severe metal pollution during the twentieth century; yet little is known about the trace metal sources and pre-industrial human activities. We have determined the elemental concentrations and zinc stable isotope ratios (δ66Zn) in bulk sediments and the trace metal concentrations in chemical fractions of a 9-m-long sediment core from Osaka Bay. Our goals were (1) to reconstruct the historical trace metal contamination, and (2) to identify anthropogenic Zn sources and the solid phases of anthropogenic trace metals. The core provided a continuous environmental record of the last 2300 years based on radiocarbon dating of molluscan shells. Copper, Zn, and Pb showed an initial enrichment from the 1670s AD, which could be caused by human activities due to an increasing population. In agreement with previous findings, the trace metal concentrations slightly increased from the 1870s, strongly increased from the beginning of the twentieth century, and peaked around 1960 before environmental pollution control laws were enacted. Increasing trace metal concentrations in the acid-labile and reducible fractions obtained by the Community Bureau of Reference (BCR) sequential extraction procedure toward the surface indicate carbonates and Mn oxyhydroxides were the primary fractions for anthropogenic trace metals. The δ66Zn values (1) were constant until the 1940s, suggesting that the average δ66Zn of industrial sources was indistinguishable from that value of the natural background, (2) showed a slight decrease from the 1950s and remained constant until the present, and (3) fell in a binary mixing process between a lithogenic (~ + 0.27‰) and an anthropogenic endmember (~ + 0.17‰), the latter likely representing a mixture of various Zn sources such as road dust, tire wear, industrial effluents, and effluents from wastewater treatment plants. We conclude the combination of Zn stable isotopes together with chemical fractions obtained by the BCR method represents a promising approach to assess the trace metal sources and their potential mobility in sediment cores from anthropogenically affected coastal areas.

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Section: Zinc Stable Isotopes As Tracer For Zn Contaminationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Metal contamination in a sediment core from Osaka Bay during the last 400 years

Nitzsche

Yoshimura

Ishikawa

et al. 2022

Prog Earth Planet Sci

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show abstract

“…ても報告されている [4][5][6][7] 。このことから，宍道湖と中海の堆積物上層で観測された Zn の濃度上昇には，中国大陸からの越境輸送だけでなく，国内での人為発生源が大きく寄与している可能性がある。 Zn は 5 種類の安定同位体( 64 Zn， 66 Zn， 67 Zn， 68 Zn， 70 Zn)を有し，自然界では 64 Zn 48.86％， 66 Zn 27.62％， 67 Zn 4.12％， 68 Zn 18.71％， 70 Zn 0.69％の割合で存在する 8) 。Zn は沸点が比較的低いため，高温での燃焼時に容易に蒸発する。その際に同位体分別を生じ，亜鉛精錬ではガス中により軽い同位体が濃縮し，逆にスラグ等の固体中により重い同位体が濃縮することが報告されている [9][10][11][12] 。Zn 同位体比 4,6,7,13,14)…”

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