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Water Science & Technology Vol 43 No 2 pp 125–132 © IWA Publishing 2001 Comparison between estrogenicities estimated from DNA recombinant yeast assay and from chemical analyses of endocrine disruptors during sewage treatmentH Tanaka*, Y Yakou**, A Takahashi***, T Higashitani**** and K Komori******
Water Quality Division, Public Works Research Institute,
Ministry of Land, Infrastructure and Transport,
1 Asahi, Tsukuba, Ibaraki 305-0804, Japan
ABSTRACT This study discusses the estrogenicity and the extent of estrogenic effects, of sewage and treated sewage in public sewage treatment plants in Japan. The estrogenicity in this study was measured with a DNA recombinant yeast strain. Using this method, 43 chemicals that are suspected to have estrogen-like effects were measured and their estrogenicities were evaluated in terms of 17  -estradiol equivalents
by comparison with the estrogenicity of 17-estradiol. 17-estradiol
equivalents of influent and effluent sampled from 20 sewage treatment
plants (STPs) were measured with this method. Because the concentrations
of endocrine disruptors (EDs) in the STPs were monitored by the Ministry
of Construction (MOC), the estrogenic effects estimated from the chemical
data were obtained as a theoretical estrogenicity in terms of
17-estradiol equivalent. The results suggest that STPs effectively
reduce the estrogenicity and the theoretical estrogenicity during
treatment, and that there were some differences between the estrogenicity assayed by the yeast and the theoretical estrogenicity in many STPs,
particularly in influent sewage. Therefore, it is implied that unknown
estrogen-like substances or antagonists might exist in influent sewage
and treated sewage in STPs.
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