ABSTRACT
A fly ash sample found to contain polychlorinated dioxins and dibenzofurans was analyzed for brominated analytes. Bromochloro-polynuclear aromatic hydrocarbons, dioxins and dibenzofurans, as well as bromo PAH were found in ppt to ppb concentrations. Analytical results were confirmed by high-resolution mass spectrometric accurate mass determinations and by tandem mass spectrometry.
Subject(s)
Benzofurans/analysis , Carbon/analysis , Dioxins/analysis , Hydrocarbons, Halogenated/analysis , Polycyclic Compounds/analysis , Coal Ash , Gas Chromatography-Mass Spectrometry , Mass Spectrometry , Particulate MatterABSTRACT
The method presented here allows calculation of the retention indices for the chlorinated dibenzo-p-dioxins under a specific set of experimental conditions, using a limited data set. This technique provides a simple way to obtain retention index data for those isomer standards not readily available. Thus, the technique can aid in structure assignment of specific congeners whether obtained from synthesis or found in environmental monitoring efforts. These calculations have proved highly successful in checking gas chromatographic retention data for internal consistency.
Subject(s)
Dioxins/analysis , Chemical Phenomena , Chemistry , Chromatography, Gas , Polychlorinated Dibenzodioxins/analysisABSTRACT
An extension of the Mannich reaction, in which aminomethylation of the five position of uracil, is reported. Thus, primary and secondary alkylamines and primary aromatic amines containing ring-activating groups led to the title compounds 3-10. Compound 11 in which the aromatic ring contains the ring-deactivating nitro group was synthesized in an alternative way. All compounds were characterized by their elemental and spectral properties.
