Atmospheric Deposition Modeling of Polychlorinated Dibenzo-p-dioxins, Dibenzofurans and Polychlorinated Biphenyls in the Ambient Air of Southern Taiwan. Part II. Wet Depositions and Total Deposition Fluxes

Tseng, Yu-Jung; Mi, Hsiao-Hsuan; Hsieh, Lien‐Te; Liao, Wei-Tung; Chang-Chien, Guo-Ping

doi:10.4209/aaqr.2014.07.0150

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…This is because the annual average temperature in Nanjing (16.4°C) is lower than that in Guangzhou (21.7°C), and the fraction of total-PCDD/Fs-WHO 2005 -TEQ in the particle phase in Nanjing (75%) is higher than that in Guangzhou (59%) (Chandra Suryani et al, 2015). Compared with previous studies, the scavenging ratios of total-PCDD/Fs-WHO 2005 -TEQ are similar to the typical ratio of semi-volatile organic compounds, which is between 10 4 and 10 5 (Eitzer and Hites, 1989;Tseng et al, 2014;Chandra Suryani et al, 2015).…”

Section: Wet Depositionmentioning

confidence: 63%

“…The annual rainfall was 1091.1 mm in Nanjing, and was strongest in July (263.5 mm) and August (158.8 (Tseng et al, 2014). The amount of precipitation in Nanjing was less than that in Guangzhou, but the amount of wet deposition was similar, thus demonstrating that wet deposition is not only affected by rainfall, but also by factors such as particulate matter concentration, temperature, and wind speed (Wang et al, 2010;Huang et al, 2011b).…”

Section: Wet Depositionmentioning

confidence: 79%

“…5. The total scavenging ratios (S tot ) increase with temperature in both cities (Bidleman, 1988;Mandalakis and Stephanou, 2004;Tseng et al, 2014). In Guangzhou, the S tot of total-PCDD/Fs-WHO 2005 -TEQ ranged between 16350 to 34970, with an average of 24080.…”

Section: Wet Depositionmentioning

confidence: 99%

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Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Two Cities of Southern China

Zhu

Xing

Tang

et al. 2017

Aerosol Air Qual. Res.

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Section: Wet Depositionmentioning

confidence: 63%

Section: Wet Depositionmentioning

confidence: 79%

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Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Two Cities of Southern China

Zhu

Xing

Tang

et al. 2017

Aerosol Air Qual. Res.

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“…The atmosphere is the main transport pathway, major source of PCBs to many aquatic ecosystems and an important media to under the behavior of PCBs (Hoff et al, 1996;Tseng et al, 2014a). PCBs are semivolatile compounds (Tseng et al, 2014b) and redistribute between the gas and particle after they enter the atmospher, are subjected to removal mechanisms and reach a partitioning equilibrium depended on temperature and vapor pressure of chemicals (Wania et al, 1998;Yeo et al, 2003). The fate of atmospheric POPs is primarily determined by their gas-particle partitioning (Pankow and Bidleman, 1992;Cotham and Bidleman, 1995;Cincinelli et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation and Gas/Particle Partitioning of PCBs in Air from Central Urban Area of an Industrial Base and Coastal City -Tianjin, China

Zhang

Chen

2015

Aerosol Air Qual. Res.

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The 26 air samples were collected from Tianjin urban areas from July 2010 to May 2011 for the analysis of 86 PCB congeners to investigate the gas/particle partitioning of PCBs. The total PCBs concentration (in pg/m 3 ) ranged from 31.28 to 650.33 (mean: 273.77) and showed a significantly seasonal variation as summer > autumn > spring > winter. Gas PCBs accounted for 80.79% of total PCBs. The fraction of each gas PCB homolog increased with the decreasing chlorine atoms. The contribution of gas PCBs to total PCBs showed a strong seasonal variation with summer (94.07%) > autumn (78.91%) > spring (78.19%) > winter (56.02%). Tri-, tetra-and penta-PCBs were the predominantly homologs in Tianjin atmosphere. The natural logarithm of partial pressure of PCBs were well correlated with the inverse absolute environmental temperature (R = 0.79). The steep slope of -4933.64 obtained from Clausius-Clapeyron (C.C) plot indicated the influence of local PCBs sources. In generally, the C.C slopes and the surface-air exchange enthalpy (∆H SA ) for different PCB homologs increased with the increasing chlorine atoms. The fraction of particle bound PCBs were underestimated for PCBs with P L 0 > 10 -3.85 Pa and overestimated for PCB congeners with P L 0 < 10 -3.85 Pa by Junge-Pankow model. The logarithm of particle/gas partitioning coefficients (log K P ) of PCBs were well correlated with the logarithm of respective sub-cooled vapor pressures (log P L 0 ) (R = 0.72) and the octanol-air partition coefficient (log K OA ) (R = 0.77). The slopes for log K P against log P L 0 and log K OA plots were -0.44 and 0.48, deviated significantly from the expected -1 and +1 for the equilibrium state of gas/particle partitioning, possibly explained by the emission of PCBs and particles from the local industries and other sources. The TEQ concentrations (fg/m 3 ) for 12 dioxin-like PCB congeners ranged from 35.628 to 612.796 with the mean value as 144.878.

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A comparison of the levels and particle size distribution of lower chlorinated dioxin/furans (mono- to tri-chlorinated homologues) with those of tetra- to octa-chlorinated homologues in atmospheric samples

et al. 2016

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h i g h l i g h t sSCl 1e3 DD/Fs accounted for 85% of SCl 1e8 DD/Fs in air samples. The mean concentration of SCl 1e3 DD/Fs was 5.4 times that of SCl 4e8 DD/Fs in the air. SCl 1e3 DD/Fs occurred mainly in the gas phase, and SCl 4e8 DD/Fs mainly in particles. SCl 1e3 DFs were the dominant form of SCl 1e3 DD/Fs in all particle size classes. t r a c tThere is very little information on the levels and particle size distributions of lower chlorinated dibenzop-dioxins and dibenzofurans (mono-to tri-CDD/Fs, SCl 1e3 DD/Fs) in the atmosphere, while a number of studies have examined tetra-to octa-chlorinated homologues (SCl 4e8 DD/Fs). In this study, we measured the concentration and particle size distribution of SCl 1e3 DD/Fs in ambient air in suburban Beijing and compared them with that of SCl 4e8 DD/Fs for the first time. The mean concentration of SCl 1e3 DD/Fs was 54.63 pg m À3 , which is about 5.4 times that of SCl 4e8 DD/Fs. The SCl 1e3 DD/Fs accounted for 85% of SCl 1 e8 DD/Fs, and MoCDFs made up the largest proportion (43%) of PCDD/F homologues. The SCl 1e3 DD/Fs mainly occurred in the gas phase, while the SCl 4e8 DD/Fs mainly occurred in the particulate phase. The majority of SCl 1e3 DD/Fs (70%) occurred in d ae > 1.0 mm particles, which is the reverse of the trend observed for SCl 4e8 DD/Fs, of which 78% occurred in d ae < 1.0 mm particles. The observed high concentrations of SCl 1e3 DD/Fs and different distribution patterns demonstrate that it is necessary to consider the lower chlorinated homologues to improve our understanding of the environmental behavior and health risk assessments of PCDD/Fs in the atmosphere.

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Atmospheric Deposition Modeling of Polychlorinated Dibenzo-p-dioxins, Dibenzofurans and Polychlorinated Biphenyls in the Ambient Air of Southern Taiwan. Part II. Wet Depositions and Total Deposition Fluxes

Abstract: The wet deposition flux increased with stronger rainfall intensity. From the congener profiles of PCDD/F and PCB WHO-TEQ 2005 total deposition fluxes, 2,3,4,7, 2,3,4,6,7, 1,2,3,4,7,2,3,7,

Cited by 8 publications

References 20 publications

Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Two Cities of Southern China

Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Two Cities of Southern China

Seasonal Variation and Gas/Particle Partitioning of PCBs in Air from Central Urban Area of an Industrial Base and Coastal City -Tianjin, China

A comparison of the levels and particle size distribution of lower chlorinated dioxin/furans (mono- to tri-chlorinated homologues) with those of tetra- to octa-chlorinated homologues in atmospheric samples

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