title: [Levels of polychlorinated dibenzo-p-dioxins and dibenzofurans in airborne fine particulate matter and inhalation risk assessment for local residents of Shenzhen].
abstract: OBJECTIVE
  To explore the levels and congener profiles of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in airborne fine particulate matter (PM25) in Shenzhen and roughly discuss its correlations between PM25 concentration and meteorological factors.
  
  
  METHODS
  The high volume air samplers were used to collect the samples in six sampling sites in respective winter and spring phase and summer and autumn phase. Referring to the US EPA TO-9A for dioxins detection methods, the concentrations of the 17 polychlorinated dibenzo-p-dioxins and dibenzofurans in airborne fine particulate matter were determined by HRGC/HRMS.
  
  
  RESULTS
  The total concentrations of PCDD/Fs ranged from 0.32 to 9.35 pg/m3, with average of 2.45 pg/ m3. The TEQ concentrations ranged from 0.006 to 0.388 pg I-TEQ/m3, with average of 0.095 pg I-TEQ/m3. The four abundant congeners were found to be OCDD (36.49%), 1, 2, 3, 4, 6, 7, 8-HpCDF (14.89%), OCDF (13.34%) and 1, 2, 3, 4, 6, 7, 8-HpCDD (10.92%). 2, 3, 4, 7, 8-PeCDF was the dominant contributor to toxicity equivalent (TEQ), accounting for 34.65%. Positive relationship was found between the levels of fine particle-bound PCDD/Fs and PM2.5 concentration (r(s) = 0.794, P = 0.006), whereas no correlation was observed for temperature, humidity and atmospheric pressure. Inhalation exposure to PCDD/Fs were 0. 023 pg I-TEQ/(kg · d) for adult and 0.035 pg I-TEQ/(kg · d) for children during winter and spring and relatively higher than those during summer and autumn (0.014 pg I-TEQ/(kg · d). for adult and 0.021 pg I-TEQ/(kg · d) for children respectively).
  
  
  CONCLUSIONS
  The levels of PCDD/Fs in airborne fine particle-bound samples collected in Shenzhen were lower than those in Hangzhou and Beijing.
authors.forename: Jinling
authors.initials: J
authors.lastname: Peng
authors.forename: Jianqing
authors.initials: J
authors.lastname: Zhang
authors.forename: Shaoyou
authors.initials: S
authors.lastname: Lu
authors.forename: Yousheng
authors.initials: Y
authors.lastname: Jiang
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.forename: Shengnong
authors.initials: S
authors.lastname: Li
authors.forename: Xiaoshi
authors.initials: X
authors.lastname: Lin
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Zhou
authors.forename: Dequan
authors.initials: D
authors.lastname: Liu
authors.forename: Yixiong
authors.initials: Y
authors.lastname: Lei
mesh_terms: D000328:Adult; D001572:Benzofurans / Q000032:analysis* / Q000737:chemistry*; D002648:Child; D002681:China; D004147:Dioxins / Q000032:analysis* / Q000737:chemistry*; D006801:Humans; D052638:Particulate Matter / Q000009:adverse effects*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives; D018570:Risk Assessment
chemical_list: D001572:Benzofurans; D004147:Dioxins; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; C023614:dibenzofuran; C046839:1,2,3,4,6,7,8-heptachlorodibenzodioxin; C020887:dibenzo(1,4)dioxin