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This research was carried out to analyze polychlorinated dibenzothiophenes (PCDTs) in soil and fly ash samples collected in Japan and to estimate dioxin-like endocrine disrupting potency and photodegradability of PCDTs. PCDTs were detected in both fly ash and soil samples, though the concentrations were lower than that of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurane (PCDFs). An assay using an Ah-immnoassayðF kit for the 5 isomers with chlorine atoms substituted at 2,3,7,8-positions demonstrated the Ah receptor binding activities of the isomers except for OCDT, indicating that PCDTs have potency to cause dioxin-like endocrine disruption. The degradation of PCDTs by UV irradiation proceeded in connection with dechlorination. The photodegradation rates of 2,3,7,8-TeCDT and OCDT were lower than the corresponding isomers of PCDFs, i.e. 2,3,7,8-TeCDF and OCDF, indicating that PCDTs are more stable against photodegradation.

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Detection of Polychlorinated Dibenzothiophenes (PCDTs) in the Environmental Samples and Investigation of their Photodegradability and Dioxin-like Endocrine Disruption Potentcy