Polychlorinated dibenzothiophenes in Japanese environmental samples and their photodegradability and dioxin-like endocrine-disruption potential.
Polychlorinated dibenzothiophenes (PCDTs) in sediment, soil, and fly ash samples collected in Japan were analyzed and their dioxin-like endocrine-disruption potential and photodegradability investigated. PCDTs were detected in all three types of sample, although the concentrations were lower than those of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). An Ah-immunoassay confirmed that 2,3,7,8-TeCDT, 1,2,3,7,8-PeCDT, 1,2,3,7,8,9-HxCDT, and 1,2,3,4,7,8,9-HpCDT had Ah receptor-binding activities, which means that these PCDTs have the potential to cause dioxin-like endocrine-disruption. Photodegradation of PCDTs by UV irradiation was accompanied by dechlorination. The photodegradation rates of 2,3,7,8-TeCDT and OCDT were lower than the rates for the corresponding PCDF isomers (2,3,7,8-TeCDF and OCDF), which indicates that PCDTs are more stable than PCDFs to photodegradation.
Nakai
Satoshi
S
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan. nakai@hiroshima-u.ac.jp
Kishita
Saeko
S
Nomura
Yugo
Y
Hosomi
Masaaki
M
D001572:Benzofurans / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D001673:Biodegradation, Environmental; D000072338:Dibenzofurans, Polychlorinated; D004700:Endocrine System Diseases / Q000139:chemically induced*; D004781:Environmental Exposure; D004785:Environmental Pollutants / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D007118:Immunoassay; D007536:Isomerism; D007564:Japan; D010777:Photochemistry; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D018336:Receptors, Aryl Hydrocarbon / Q000378:metabolism; D018570:Risk Assessment; D013876:Thiophenes / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D013997:Time Factors
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D000072317:Polychlorinated Dibenzodioxins; D018336:Receptors, Aryl Hydrocarbon; D013876:Thiophenes; D011078:Polychlorinated Biphenyls