Abstract
Unsubstituted and methylated polycyclic aromatic hydrocarbons (22 PAHs and 17 Me-PAHs) were examined in surface sediments collected from the Red River and four inner-city rivers of Hanoi City, Vietnam. Concentrations of total PAHs and Me-PAHs ranged from 52 to 920 (median 710) and from 70 to 2600 (median 1000) ng/g dry weight in samples of dry and wet seasons, respectively. Significant correlation was observed between total PAHs and organic carbon contents (Spearman's ρ = 0.782; p < 0.05). PAHs were more abundant than Me-PAHs in all samples and dominated by 4–6 ring compounds. The most predominant PAHs were benzo[ghi]perylene, benzo[b/j]fluoranthene, chrysene, pyrene, fluoranthene, and phenanthrene. Methylated derivatives of naphthalene, phenanthrene, anthracene, and benz[a]anthracene were frequently detected. The patterns of PAHs indicated principal pyrogenic sources (notably gasoline exhaust) in this highly urbanized area. The occurrence of several PAHs were occasionally associated with adverse effects on benthic organisms of the inner-city rivers.
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Funding
This study was financially supported by the Vietnam's National Foundation for Science and Technology Development (NAFOSTED) (Project No. 105.08-2018.317) and the Asia–Pacific Network for Global Change Research (APN) (Project CRRP2019-10MY-Le). The Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)) (Project No. 18KK0300) from the Japan Society for the Promotion of Science (JSPS) and the Project “On-site Education Program in Analytical Chemistry” (OEPAC) of The University of Tokyo and Japan Analytical Instruments Manufacturer's Association (JAIMA) are also acknowledged.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by all authors. The first draft of the manuscript was written by AQH and revised by TPQL. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Hoang, A.Q., Takahashi, S., Da Le, N. et al. Unsubstituted and Methylated PAHs in Surface Sediment of Urban Rivers in the Red River Delta (Hanoi, Vietnam): Concentrations, Profiles, Sources, and Ecological Risk Assessment. Bull Environ Contam Toxicol 107, 475–486 (2021). https://doi.org/10.1007/s00128-021-03174-y
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DOI: https://doi.org/10.1007/s00128-021-03174-y