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Mundo R, Iwai H, Ochiai S, Matsunaka T, Hasebe N, Nagao S. 140 years-long sedimentary records of PAHs and CN stable isotopes from Ninomiya River, Japan. MARINE POLLUTION BULLETIN 2023; 192:114943. [PMID: 37163791 DOI: 10.1016/j.marpolbul.2023.114943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 04/02/2023] [Accepted: 04/10/2023] [Indexed: 05/12/2023]
Abstract
Anthropogenic activities' impacts over 140 years were studied at West Nanao Bay using a variety of geochemical techniques on sedimentary records. The bay is influenced by the Ninomiya River which is fed by a small watershed at which Tatzuruhama Town is located. Sedimentation rate was calculated using 210Pb-excess and 137Cs activities. C/N decreased after 1975, indicating a decrease in lignin-rich organic matter. From δ13C, δ15N and biogenic silica it was indicated that the population increased sewage-discharges until the construction of waste-water treatment plant in 1986. Several recorded changes in the landuse matched with the variation of the particle size. Total PAHs concentration was 1.17-62.78 μg g-1, being highest during Japan's fastest economic growth period (1946-1975). Using diagnostic ratios and PCA analysis, PAHs' sources were identified as pyrogenic for all depths, varying from coal combustion (90.7 %) before 1946 to a mixture of biomass and vehicle combustion after 1961.
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Affiliation(s)
- Rodrigo Mundo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan
| | - Hisanori Iwai
- Sustainable Energy & Environmental Society Open Innovation Research Organization, Waseda University, Shinjuku, Tokyo 169-8555, Japan.
| | - Shinya Ochiai
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
| | - Tetsuya Matsunaka
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
| | - Noriko Hasebe
- Institute of Nature and Environmental Technology, Kanazawa University, Ishikawa 920-1192, Japan.
| | - Seiya Nagao
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
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Mundo R, Matsunaka T, Iwai H, Ochiai S, Nagao S. Environmental processes and fate of PAHs at a shallow and enclosed bay: West Nanao Bay, Noto Peninsula, Japan. MARINE POLLUTION BULLETIN 2022; 184:114105. [PMID: 36115196 DOI: 10.1016/j.marpolbul.2022.114105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 08/31/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
From August 2019 to August 2020, particulate and dissolved polycyclic aromatic hydrocarbons concentrations (PAHs) were analyzed in the water body of West Nanao Bay, Japan, to determinate their levels, environmental pathways, and ecological risks at this remote but shallow and semi-enclosed bay. The 14 targeted PAHs were analyzed by high performance liquid chromatography-fluorescence detector. Even when water column stratifies, the summatory of 14 targeted dissolved PAHs did not follow significantly change with depth. Results agreed with our previous findings in the surface distribution at the bay and can be attributed to long retention time of the water mass of the semi-enclosed bay. Suspended solids start precipitating according to their size; with biggest particles rapidly settling in the proximities of river mouths. Partition coefficients (Kp) varied from 103 to 107, according to molecular weights. In general, highest Kp were found in the nepheloid layer. The risk quotients, RQ∑14 PAHs (NCs) (1.04-174.08), indicated that PAHs represented a very low to low environmental risks.
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Affiliation(s)
- Rodrigo Mundo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan.
| | - Tetsuya Matsunaka
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O, Nomi, Ishikawa, 923-1224, Japan.
| | - Hisanori Iwai
- Faculty of science and Engineering, Waseda University, Tokyo, Japan.
| | - Shinya Ochiai
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O, Nomi, Ishikawa, 923-1224, Japan.
| | - Seiya Nagao
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O, Nomi, Ishikawa, 923-1224, Japan.
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Matsunaka T, Nagao S, Inoue M, Mundo R, Tanaka S, Tang N, Yoshida MA, Nishizaki M, Morita M, Takikawa T, Suzuki N, Ogiso S, Hayakawa K. Seasonal variations in marine polycyclic aromatic hydrocarbons off Oki Island, Sea of Japan, during 2015-2019. MARINE POLLUTION BULLETIN 2022; 180:113749. [PMID: 35596998 DOI: 10.1016/j.marpolbul.2022.113749] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 05/27/2023]
Abstract
Concentrations of 13 phase-partitioned polycyclic aromatic hydrocarbons (PAHs) in seawater were monitored monthly off Oki Island, Japan, during 2015-2019 to elucidate seasonal variations, main source, and transport pathways of PAHs in the southwestern Sea of Japan. Total PAH (dissolved plus particulate) concentrations in surface seawater at 36°09.0'N, 133°17.3'E (site OK) were in the range 0.49-9.36 ng L-1 (mean 2.77, SD 2.05 ng L-1) with higher levels in summer-autumn, an order of magnitude lower than those in the East China Sea during 2005 and 2009-2011 and about one-third of those recorded in the Sea of Japan in 2008 and 2010. The main sources of dissolved and particulate PAHs were combustion products. Increasing dissolved PAH levels during July-October indicate that the area around southern Oki Island is impacted by PAH-rich summer continental-shelf water transported by the Tsushima Warm Current flowing from the East China Sea.
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Affiliation(s)
- Tetsuya Matsunaka
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan; Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan.
| | - Seiya Nagao
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan; Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan.
| | - Mutsuo Inoue
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan; Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan.
| | - Rodrigo Mundo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Saki Tanaka
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Ning Tang
- Division of Atmospheric Environmental Studies, Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan; Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.
| | - Masa-Aki Yoshida
- Education and Research Center for Biological Resources, Faculty of Life and Environmental Science, Shimane University, 194 Kamo, Okinoshima-cho, Oki, Shimane 685-0024, Japan.
| | - Masanori Nishizaki
- Education and Research Center for Biological Resources, Faculty of Life and Environmental Science, Shimane University, 194 Kamo, Okinoshima-cho, Oki, Shimane 685-0024, Japan.
| | - Masaya Morita
- Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, 3422 Sesoko, Motobu, Okinawa 905-0227, Japan.
| | - Tetsutaro Takikawa
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
| | - Nobuo Suzuki
- Noto Marine Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Housu-gun, Ishikawa 927-0553, Japan.
| | - Shouzo Ogiso
- Noto Marine Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Housu-gun, Ishikawa 927-0553, Japan.
| | - Kazuichi Hayakawa
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan.
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