Sedimentation Processes of Particulate Matter in the Osaka Bay.

Hoshika, Akira; Tanimoto, Terumi; Mishima, Yasuhumi

doi:10.5928/kaiyou.3.419

Cited by 8 publications

(4 citation statements)

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“…Samples with the top 1% of concentrations for these elements, which are mostly classified as outliers, are found in Osaka Bay, and the area of high concentrations near the mouth of the Yodo and Yamato Rivers is clearly due to the discharge of contaminated sediments. Hoshika and Shiozawa [27], Hoshika et al [48], and Manabe [49] reported the same results, showing large accumulations of Cr, Cu, Zn, Cd, Pb, and Hg in Osaka Bay.…”

Section: Transfer Of Materials Related To Mineral Deposits and Anthrosupporting

confidence: 65%

Statistical Analysis of the Spatial Distribution of Multi-Elements in an Island Arc Region: Complicating Factors and Transfer by Water Currents

Ohta

Imai

Tachibana

et al. 2017

Water

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Abstract:The compositions and transfer processes affecting coastal sea sediments from the Seto Inland Sea and the Pacific Ocean are examined through the construction of comprehensive terrestrial and marine geochemical maps for western Japan. Two-way analysis of variance (ANOVA) suggests that the elemental concentrations of marine sediments vary with particle size, and that this has a greater effect than the regional provenance of the terrestrial material. Cluster analysis is employed to reveal similarities and differences in the geochemistry of coastal sea and stream sediments. This analysis suggests that the geochemical features of fine sands and silts in the marine environment reflect those of stream sediments in the adjacent terrestrial areas. However, gravels and coarse sands do not show this direct relationship, which is likely a result of mineral segregation by strong tidal currents and the denudation of old basement rocks. Finally, the transport processes for the fine-grained sediments are discussed, using the spatial distribution patterns of outliers for those elements enriched in silt and clay. Silty and clayey sediments are found to be transported and dispersed widely by a periodic current in the inner sea, and are selectively deposited at the boundary of different water masses in the outer sea.

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Section: Transfer Of Materials Related To Mineral Deposits and Anthrosupporting

confidence: 65%

Statistical Analysis of the Spatial Distribution of Multi-Elements in an Island Arc Region: Complicating Factors and Transfer by Water Currents

Ohta

Imai

Tachibana

et al. 2017

Water

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“…In contrast to Tokyo Bay, we did not detect a positive correlation between the PFCA concentrations and the orgasmic matter concentration in the sediment from the Seto Inland Sea (r = 0.496, p < 0.06). However, we observed a significant positive correlation between the PFCA concentrations in the sediment samples and the sedimentation rates [25][26][27][28][29] near the sampling stations (r = 0.935, p < 0.00003; Fig. 4) except for Kii Channel (Stns.…”

Section: Locationmentioning

confidence: 99%

“…We therefore speculate that the sedimentation of marine POM-adsorbed PFCAs is one of the driving forces in the accumulation of PFCAs in sediment of the Seto Inland Sea. We thus roughly estimated the sedimentation flux from the sedimentation rate [26][27][28][29] and the concentration of PFCAs in the sediments (Fig. 5).…”

Section: Locationmentioning

confidence: 99%

Spatial Distribution of Perfluorinated Organic Compounds in Surface Marine Sediments from the Seto Inland Sea, Japan

Asaoka

Yoshiki

Haga

et al. 2020

J. of Wat. & Envir. Tech.

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Perfluoroalkyl substances (PFASs) such as perfluorocarboxylic acid (PFCAs) and perfluoroalkane sulfonates (PFSAs) are persistent, bioaccumulative, and toxic substances that are distributed worldwide. Here we investigated the current concentrations of PFASs in the surface sediments from the Seto Inland Sea, Japan. The concentrations of PFCAs in surface sediments from the Sea ranged from 0.05 to 0.67 ng g −1. Perfluoroundecanoic acid (PFUnDA) was detected at all 15 sampling stations; its concentration was 0.05-0.24 ng g −1. Perfluorohexanoic acid (PFHxA), which is used as an alternative to perfluorooctanoic acid (PFOA), was detected in Osaka Bay and Kii Channel. The contamination of PFCAs in the sediment from Osaka Bay and Kii Channel is shifting to PFHxA. In contrast, only perfluorooctanesulfonic acid (PFOS) was detected at the center part of the bays in the Sea. The significant positive correlation between the PFCAs concentrations in the sediment and the sedimentation rates was observed in the Sea. Hence, the concentration of PFCAs in surface sediments from the Sea was controlled by the sedimentation rate.

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“…In the present study, we calculated the POPs' sedimentation fluxes from both the concentrations of POPs in POM and the POM sedimentation flux measured in prior investigations (Matsuda et al 1977;Hoshika et al 1983Hoshika et al , 1994Hoshika 2008) near our present sampling stations (Table 7). The sedimentation fluxes of HCHs, HCB and DDTs were small except at Stations O-1 (DDTs; 9.1 pg cm −2 y −1 ) and O-4 (DDTs; 17 pg cm −2 y −1 ), indicating that the sedimentation might not significantly affect the concentration of these pollutants in surface sediment.…”

Section: The Factors Controlling the Concentrations Of Pops In Surfac...mentioning

confidence: 99%

Persistent organic pollutants are still present in surface marine sediments from the Seto Inland Sea, Japan

Asaoka

Umehara

Haga

et al. 2019

Marine Pollution Bulletin

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Sedimentation Processes of Particulate Matter in the Osaka Bay.

Cited by 8 publications

References 0 publications

Statistical Analysis of the Spatial Distribution of Multi-Elements in an Island Arc Region: Complicating Factors and Transfer by Water Currents

Statistical Analysis of the Spatial Distribution of Multi-Elements in an Island Arc Region: Complicating Factors and Transfer by Water Currents

Spatial Distribution of Perfluorinated Organic Compounds in Surface Marine Sediments from the Seto Inland Sea, Japan

Persistent organic pollutants are still present in surface marine sediments from the Seto Inland Sea, Japan

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