PCDD/F and dioxin-like PCB in Hong Kong air in relation to their regional transport in the Pearl River Delta region

Choi, Maggie; Ho, Simon K.M.; So, Benny K.L.; Cai, Zongwei; Lau, Alexis K.H.; Wong, Ming Hung

doi:10.1016/j.chemosphere.2007.09.060

Cited by 47 publications

(13 citation statements)

References 12 publications

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“…As an island nation located to the southeast of China, Taiwan experiences northeastern monsoons and continental air masses in winter. During this season, cold air from northern China flows to the downwind regions such as Taiwan, Hong Kong, and Korea, carrying pollutants from emission sources located on this transport route (Cheng et al, 2008;Choi et al, 2008;Hsu et al, 2009;Min et al, 2013). A few days before monsoons and cold-air masses reach Taiwan, they were weakened due to the effect of the island (Chi et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

“…For example, prevailing monsoons that are active at high speeds from a single general direction transfer pollutants via atmospheric transport from their emission sources to Taiwan, thereby increase pollutant concentration in downwind regions (Cheng et al, 2008;Chi et al, 2013b). Moreover, poor atmospheric dispersion and certain geographical factors may lower the mixing-layer height, make pollutants accumulate in the atmosphere and cause local pollution (LP) (Cheng et al, 2008;Choi et al, 2008). The coastal regions of China have highly developed economic and intense industrial activity.…”

Section: Introductionmentioning

confidence: 99%

“…; (Li et al, 2008), Beijing (35.0-751 fg I-TEQ m -3 ; (Zhou et al, 2014), and Hong Kong (69.8-152 fg ; (Choi et al, 2008) have higher atmospheric PCDD/F concentrations than that of Sichuan (40-1930 fg I-TEQ m -3 ; and Harbin (51.2-61.9 fg WHO-TEQ m -3 ; (Meng et al, 2016). Moreover, compared with the coastal and inland regions of China, northern Taiwan has lower atmospheric PCDD/F concentrations (e.g., 10.4-48.4 fg I-TEQ m -3 (Chi et al, 2013a) and 36 fg I-TEQ m -3 (Ho et al, 2016)).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variation of PM2.5 and Atmospheric PCDD/Fs in Northern Taiwan during Winter Monsoon and Local Pollution Episodes

Hsien¹,

Li²,

Hung³

2017

Aerosol Air Qual. Res.

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Winter monsoonal air masses traveling from Inner Mongolia to downwind nations can transport cold temperature and air pollutants. This study investigated the effects of the long-range transport (LRT) of air pollutants by northeastern monsoons and local pollution (LP) episodes on atmospheric PM 2.5 , polychlorinated dibenzo-p-dioxin (PCDD), and polychlorinated dibenzofuran (PCDF) concentrations in northern Taiwan during the winters of 2014 and 2015. Air samples were collected in rural (Rural Site 1 was mountainous; Rural Site 2 was coastal) and urban (Urban Site 1 was urban; Urban Site 2 was suburban) areas in northern Taiwan as well as at a background site (Lulin Mountain) in central Taiwan. Atmospheric PCDD/F concentrations measured at different sites ranged from 11.0 ± 2.70 to 39.7 ± 22.7 fg international toxicity equivalency quantity (I-TEQ) m -3 in 2014 and 7.99 ± 5.58 to 17.5 ± 12.3 fg I-TEQ m -3 in 2015. During LRT and LP, the proportion of PCDFs was higher than that of PCDDs. Rural Site 1 (122 pg I-TEQ g

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variation of PM2.5 and Atmospheric PCDD/Fs in Northern Taiwan during Winter Monsoon and Local Pollution Episodes

Hsien¹,

Li²,

Hung³

2017

Aerosol Air Qual. Res.

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“…Previous studies associated with the occurrences and profiles of PCBs, PCDDs and PCDFs in Hong Kong have focused on marine sediment, the atmosphere, biota and human breast milk (Choi et al 2008;Hedley et al 2006;Kang et al 2011;Kueh and Lam 2008;Louie and Sin 2003;Nelson et al 2006;Wong et al 2013). There is still little available information on PCBs, PCDDs and PCDFs in the soils of Hong Kong.…”

Section: Concentrations Of Pcns Pcbs Pcdds and Pcdfsmentioning

confidence: 99%

Occurrence, profile and possible sources of PCNs in Hong Kong soils, and a comparison with PCBs, PCDDs and PCDFs

Liu

Cai

2014

Environ Sci Pollut Res

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Polychlorinated naphthalenes (PCNs) have been proposed for inclusion in the annexes of the Stockholm Convention by the European Union, signifying a probable increase in monitoring PCN levels at a global level. Investigations on PCN levels in the environment of Hong Kong have not been reported. In this preliminary investigation, PCN levels in surface soils samples were determined by isotope dilution HRGC/HRMS techniques, and compared with those of polychlorinated biphenyl (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). The concentrations of PCNs in the soil samples were 35-883 pg g −1 (average, 201; and median, 94 pg g), which were lower than those of PCBs PCDDs and PCDFs. This comparison suggested that PCNs are currently not priority POPs compared with dioxins and PCBs in Hong Kong soils. PCDDs were the most important contributor to the sum of toxic equivalents of PCNs, PCBs, PCDDs and PCDFs. OCDD was the most dominant dioxin congener in Hong Kong surface soils. PCB-118 was the most abundant in 12 dl-PCB congeners. PCN congeners indicating thermal related sources (CN52/60, CN66/67 and CN73) were relatively abundant in their respective homologs, which suggested PCN contamination from thermal sources. The ratio of CN73 to CN74 in soil samples suggested the contribution of PCN contaminations in soils from both thermal-related sources and evaporative emissions of technical PCN mixtures.

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“…Although they have been banned for decades, PCBs are still ubiquitous environmental pollutants around the world, and they have been found in environmental media (including air, water, sediment, and soils) Remediat. 2017;S1: [10][11][12][13][14][15][16][17][18][19][20][21] and in human serum and milk [28,29]. PCB concentrations in human blood have been decreasing since the 1970s, mainly because of the ban on their use [19].…”

Section: Introductionmentioning

confidence: 99%

Polybrominated diphenyl ether, polychlorinated biphenyl, and dechlorane plus concentrations in human serum, and their relationships with thyroid hormones.

Wang¹,

Xu²,

Li³

et al. 2017

Environ Risk Assess Remediat

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Persistent halogenated organic compounds, including polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyls (PCBs), and dechlorane plus (DP), were determined in human serum collected in Weifang and Nanning, China, and the relationships between their concentrations and thyroid hormone concentrations were determined. The total PBDE (∑ 10 PBDEs), total PCB (∑ 14 PCBs), and total DP (∑DP) concentrations were higher in Weifang (medians 220, 4.3, and 2.2 ng/g lipid, respectively) than in Nanning (medians 180, 1.9, and 1.5 ng/g lipid, respectively). The donors' ages correlated with ∑ 14 PCBs but not with ∑ 10 PBDEs or ∑DP in Weifang. Age positively correlated with ∑ 10 PBDEs but not ∑ 14 PCBs and ∑DP in Nanning. The correlations between the individual PBDE, PCB, and DP congener and thyroid hormone concentrations were analyzed by stepwise multiple linear regression after log 2 -transforming the variables. Triiodothyronine (T3) concentrations were associated with BDE-99 concentrations and ∑DP in Weifang but with BDE-153 concentrations and ∑ 10 PBDEs in Nanning. A positive correlation was found, for the first time, between anti-DP and free-T3 concentrations in Weifang, but free-T3 concentrations correlated with PCB-118 and PCB-170 concentrations in Nanning. Thyroxine (T4) concentrations correlated with total dioxin-like PCB concentrations in Weifang but with PCB-156 concentrations in Nanning. No significant correlations were found between the analyte and free-T4 concentrations in Weifang, but negative correlations were found between free-T4 and total dioxin-like PCB and BDE-190 concentrations in Nanning. No significant correlations were found between the analyte and thyroid-stimulating hormone (TSH) concentrations in Weifang but negative correlations were found between ∑ 10 PBDEs and the TSH concentrations in Nanning. The correlations between the analyte and thyroid hormone concentrations followed different trends in Weifang and Nanning but were similar to those that have been found in animal and epidemiological studies. AbstractPolybrominated diphenyl ether, polychlorinated biphenyl, and dechlorane plus concentrations in human serum, and their relationships with thyroid hormones.

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PCDD/F and dioxin-like PCB in Hong Kong air in relation to their regional transport in the Pearl River Delta region

Cited by 47 publications

References 12 publications

Spatial and Temporal Variation of PM2.5 and Atmospheric PCDD/Fs in Northern Taiwan during Winter Monsoon and Local Pollution Episodes

Spatial and Temporal Variation of PM2.5 and Atmospheric PCDD/Fs in Northern Taiwan during Winter Monsoon and Local Pollution Episodes

Occurrence, profile and possible sources of PCNs in Hong Kong soils, and a comparison with PCBs, PCDDs and PCDFs

Polybrominated diphenyl ether, polychlorinated biphenyl, and dechlorane plus concentrations in human serum, and their relationships with thyroid hormones.

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