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DECHLORINATION-CONTROLLED POLYCHLORINATED DIBENZOFURAN FROM MUNICIPAL WASTE INCINERATORS
Citation:
Iino**, F, T. Imagawa, AND B K. Gullett*. DECHLORINATION-CONTROLLED POLYCHLORINATED DIBENZOFURAN FROM MUNICIPAL WASTE INCINERATORS. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 34(15):3143-3147, (2000).
Description:
The ability to predict polychlorinated dibenzofuran (PCDF) isomer patterns from municipal waste incinerators (MWIs) enables an understanding of PCDF formation that may provide preventive measures. This work develops a model for the pattern prediction, assuming that the peak ratios relative to the total four heptachloro-dibenzofuran (H7CDF) isomers are determined by relative position-specific dechlorination kinetics from an octachloro-dibenzofuran (O8CDF) parent to H7CDFs, and that these probabilities can subsequently predict the relative concentrations of lower chlorinated isomers. Agreement of PCDF isomer patterns between the model and sampled data from eight MWIs is consistent with formation of tetrachloro-dibenzofurans through H&CDFs by dechlorination from an O8CDF parent. The application of the analogous theory to predict isomer patterns of polychlorinated dibenzo-p-dixons (PCDDs) did not provide any significant results, which implies that the formation mechanism of PCDDs is controlled by other factors such as condensation of precursors and further chlorination. This method can be a fundamental basis to develop a prediction model for total PCDFs emission and toxic equivalent (TEQ) values.