Characteristics of azaarenes and dioxins in gases emitted from waste incinerators |
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Authors: | Kotaro Minomo Nobutoshi Ohtsuka Kiyoshi Nojiri Yasundo Kurata Masafumi Karaushi Yugo Isobe |
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Institution: | (1) Center for Environmental Science in Saitama, 914 Kamitanadare, Kisai-machi, Kitasakitama-gun, Saitama 347-0115, Japan |
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Abstract: | In this study, we propose an analytical method to determine the fourteen of azaarenes present in flue gas samples collected
according to Japanese Industrial Standard K 0311, which designates the method for the determination of dioxins in flue gas.
Azaarenes can be analyzed using the acidic water phase after shaking extraction with dichloromethane, which is unnecessary
for dioxin analysis. Flue gas samples were obtained from 24 waste incinerators in Japan, and azaarenes were detected in all
the flue gas samples (0.21–3800 μg/m3
N). The most abundant of the detected compounds were quinoline and isoquinoline. The concentration of azaarenes had a tendency
to increase with that of polychlorinated dibenzo-p-dioxins and dibenzofurans. The isomer distribution of heptachloro-dibenzofurans (HpCDFs) was calculated using the computed
Gibbs energy of formation (ΔG
f
) obtained by the semiempirical molecular orbital method at various temperatures. The calculated isomer distribution was fitted
to the measured value of HpCDFs. It seems that the temperature obtained from the fitting calculations is an indicator of the
cooling capacity of the combustion gas in an incinerator. The computed ΔG
f
also explained the measured isomer distributions of azaarenes. It is suggested that the isomer distribution of azaarenes
in the combustion process is thermodynamically controlled.
This work was presented in part at the International Conference on Combustion, Incineration/Pyrolysis, and Emission Control,
2006, Kyoto |
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Keywords: | Azaarene PCDD/Fs Waste incinerator Flue gas MNDO |
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