Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins (PCDDs) and Polychlorinated Dibenzofurans (PCDFs) in Kanazawa, Japan

Oka, Hideo; Kakimoto, Hitoshi; Miyata, Yoshiaki; Yonezawa, Yumiko; Niikawa, Akiko; Kyudoh, Hirohisa; Kizu, Ryoichi; Hayakawa, Kazuichi

doi:10.1248/jhs.52.300

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…Results also showed that the total deposition flux was highest in winter, which is consistent with the observations reported in other studies (Ogura et al, 2001;Moon et al, 2005). The increase of total deposition flux in winter may be due to the inversion layers that reduced atmospheric dilution (Oka et al, 2006). Additionally, the annual total deposition fluxes were comparable to those measured in the urban area (68-228 ng/m 2 -year) and suburban area (38-252 ng/m 2 -year) in Korea (Moon et al, 2005) and several locations (1.0-14.9 ng I-TEQ/m 2 -year) in Germany (Wallenhorst et al, 1997).…”

Section: Annual Total Deposition Flux Of Pcdd/fssupporting

confidence: 91%

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Huang

Chen

Lai

et al. 2011

Aerosol Air Qual. Res.

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The annual variations of wet deposition of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in atmosphere were measured at two sites (A and B) near two municipal solid waste incinerators (MSWIs) in southern Taiwan. Results showed that particle scavenging dominates in the wet deposition processes for the removal of PCDD/Fs from the atmosphere, the highest value was observed at the highest chlorinated congener. The ambient temperature and the amount of precipitation played an important role in the variation of PCDD/F deposition fluxes. It was found that temperature was inversely associated with the existence of particulate PCDD/Fs, indicating PCDD/Fs are scavenged most efficiently in cold weather. PCDD/F wet deposition fluxes in rainy seasons (from June to August) were significantly higher than those in dry seasons (from December to February), revealing a positive relationship between wet deposition flux and monthly rainfall. Additionally, the annual total -year) for sites A and B, respectively, revealing that dry deposition was more dominant than the wet deposition for the atmospheric deposition of PCDD/Fs. Since atmosphere deposition is believed to be the main transfer pathway of PCDD/Fs into food chains, its impact on human exposure to PCDD/Fs is of great importance.

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Section: Annual Total Deposition Flux Of Pcdd/fssupporting

confidence: 91%

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Huang

Chen

Lai

et al. 2011

Aerosol Air Qual. Res.

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“…Many studies showed that the atmosphere is also polluted with a wide range of chlorinated dioxin congeners hence could lead to, for example, the dominated level of OCDD in soil and sediment samples as highly chlorinated congeners are more efficiently scavenged by the wet deposition than less chlorinated congeners. [30][31][32] Im et al [32] also found OCDD in soil samples from a remote mountainous area and suggested that it was dominantly deposited from the air as that study area was not directly influenced by human activities. Besides, it was reported that pesticides of pentachlorophenol (PCP) and related chlorinated phenoxyphenols (PCPPs) that have previously applied to soil may serve as potential precursors [33] for the OCDD formation in the presence of UV or natural sunlight.…”

Section: Levels Of Detected Dioxin Congenersmentioning

confidence: 78%

Photodegradation of dioxin in contaminated soil in the presence of solvents and nanoscale TiO₂particles

Binh

Oanh

Parkpian

2013

Environmental Technology

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Decomposition of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) present in soil under ultraviolet (UV) illumination (350-400nm) was investigated using a combination of nontoxic solvents mixed in soil and nanoscale anatase TiO2 (nTiO2) distributed on 2mm top soil surface. Three types of UV-exposure experiments were conducted: intermittent exposure (8 h/day) for 90 days and 120 days, sequential intermittent (120 days) and continuous (24 h/day) for the next 55 days, and continuous exposure for 55 days. The influence of several factors on dioxin photodegradation efficiency was investigated, including the UV absorption by the targeted dioxin, presence of catalytic nTiO2 on soil surface, solvent evaporation rate, as well as vertical gradients of solvents added into the soil columns. Results of dioxin analysis for the soil samples collected at the end of every experiment condition show that the photodegradation enhanced by the nTiO2 presence on the soil surface considerably increased the dioxin removal. Higher removal efficiencies were found for treatments with 15%wt of nTiO2 mixed in the 2-mm surface soil as compared to the 5%wt nTiO2 treatments. The highest removal efficiency (79.6%) was for the sequential intermittent-continuous UV-exposure experiment with nTiO2. Dechlorinated products of 2,3,7,8-TCDD were generally not detected which suggests degradation of targeted dioxin by C-Cl cleavage was negligible. Further modifications to improve removal efficiencies were proposed. Large-scale engineered systems may employ this integrated treatment approach which can also incorporate the reuse of the top soil containing nTiO2 and solvent vapours. With the utilization of natural sunlight such systems would be promisingly suitable for tropical conditions.

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Review on occurrence and behavior of PCDD/Fs and dl-PCBs in atmosphere of East Asia

Trinh

Chang

2018

Atmospheric Environment

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Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins (PCDDs) and Polychlorinated Dibenzofurans (PCDFs) in Kanazawa, Japan

Cited by 10 publications

References 17 publications

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Photodegradation of dioxin in contaminated soil in the presence of solvents and nanoscale TiO₂particles

Review on occurrence and behavior of PCDD/Fs and dl-PCBs in atmosphere of East Asia

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Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins (PCDDs) and Polychlorinated Dibenzofurans (PCDFs) in Kanazawa, Japan

Cited by 10 publications

References 17 publications

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Wet Deposition of Polychlorinated Dibenzo-p-dioxins/Dibenzofuran in a Rural Area of Taiwan

Photodegradation of dioxin in contaminated soil in the presence of solvents and nanoscale TiO2particles

Review on occurrence and behavior of PCDD/Fs and dl-PCBs in atmosphere of East Asia

Contact Info

Product

Resources

About

Photodegradation of dioxin in contaminated soil in the presence of solvents and nanoscale TiO₂particles