[Patterns of PCDD/Fs, PCBs and PCNs homologues in fly ash from cement kilns].
The concentrations and toxic equivalent (TEQ) values of PCDD/Fs, PCBs and PCNs in fly ash collected from three types of cement kilns (vertical shaft kiln, wet-process rotary kiln and dry-process rotary kiln) and two types of waste incinerators were determined, and the patterns of homologues and congeners were compared. The results showed that the total TEQ of PCDD/Fs, PCBs and PCNs in cement kiln fly ash, which were in the range of 4.0-62, 0.069-3.9 and 0.47-2.8 ng x kg(-1) respectively, were much lower than that of fly ash from waste incinerators. In cement kiln fly ash, the predominating PCDD/Fs homologues were TCDFs, and the chief 2, 3, 7, 8-PCDD/Fs congeners were OCDD, 2, 3, 7, 8-TCDF and 1, 2, 3, 4, 6, 7, 8-HpCDF. The patterns of PCBs homologues in cement kiln fly ash were similar to those of waste incinerators in which TeCB were predominating homologues. PCB77, PCB105, PCB118 were at higher concentrations than other co-polar PCBs. Different types of cement kiln fly ash presented similar PCNs homologue patterns. The predominant homologues were TeCN, whereas OcCN were not detected. PCN 66/67 which has dioxin like toxity was the most abundant congener in all fly ash.
Zhang
Jing
J
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. jingzhang810@dicp.ac.cn
Ni
Yu-Wen
YW
Zhang
Hai-Jun
HJ
Zhang
Xue-Ping
XP
Zhang
Qing
Q
Chen
Ji-Ping
JP
D001572:Benzofurans / Q000032:analysis*; D002244:Carbon; D060729:Coal Ash; D003252:Construction Materials / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004784:Environmental Monitoring; D017745:Incineration; D009281:Naphthalenes / Q000032:analysis*; D052638:Particulate Matter / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D012037:Refuse Disposal / Q000379:methods
D001572:Benzofurans; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D009281:Naphthalenes; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D002244:Carbon; D011078:Polychlorinated Biphenyls