Presence of nitro-chlorinated dioxins on fly ash from municipal incinerators and from laboratory production through reactions between NO2 and T4CDD on fly ash |
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Authors: | GA Eiceman HO Rghei |
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Institution: | Department of Chemistry New Mexico State University Las Cruces, NM 88003 U.S.A. |
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Abstract: | Treatment of tetrachlorodibenzo-p-dioxin (T4CDD) on municipal incinerator fly ash at 30 to 150°C for 10 minutes using 5% (Vol/Vol) NO2 in air resulted in production of nitro-T4CDD. Percent conversion was between 40% at 50°C to 100% at 150°C. Nitro-T4CDD produced in the laboratory was unstable in hexane/methanol or hexane/acetone solutions and decomposed at ?5°C with half-lives of 8–10 days?1 to the original T4CDD.Fly ash from a municipal incinerator in Toronto, Ontario was extracted using toluene/methanol for 12 hrs in a Soxhlet extractor. Condensate of this extract was analyzed using capillary gas chromatography with flame ionization, nitrogen-selective, and mass spectrometric detectors. Retention times for nitro-T4CDD, multi-ion selected ion monitoring, and nitrogen detector response were used as supporting evidence for the presence of nitro-chlorinated dioxins as naturally occurring in this sample. |
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