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LOWLY CHLORINATED DIBENZODIOXINS AS TEQ INDICATORS. A COMBINED APPROACH USING SPECTROSCOPIC MEASUREMENTS WITH DLR JET-REMPI AND STATISTICAL CORRELATIONS WITH WASTE COMBUSTOR EMISSIONS
Citation:
Oser, H., R. Thanner, H. H. Grotheer, B K. Gullett*, D. F. Natschke, AND K. Raghunathan. LOWLY CHLORINATED DIBENZODIOXINS AS TEQ INDICATORS. A COMBINED APPROACH USING SPECTROSCOPIC MEASUREMENTS WITH DLR JET-REMPI AND STATISTICAL CORRELATIONS WITH WASTE COMBUSTOR EMISSIONS. COMBUSTION SCIENCE AND TECHNOLOGY 134(1-6):201-220, (1998).
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Description:
Continuous monitoring of trace gas species in incineration processes can serve two purposes: (i) monitoring precursors of polychlorinated dibenzodioxin and polychlorinated dibenzofuran (PCDD/F) or other indicator species in the raw gas will enable use of their on-line signals for process optimization and (ii) monitoring stack gas emissions for regulated species will establish compliance records. The sensitivities required for the first application are in the order of 10 parts per trillion by volume (10x10-12 or 10 pptv) and are now accessible with advanced methods such as Jet-REMPITM (resonance enhanced multi-photon ionization). The compliance application requires the ability to measure PCDD/F toxicity equivalents (TEQ) and would necessitate detection limits in the order of 0.001 pptv. These limits have not yet been achieved, and so REMPI-based compliance monitoring can only be indirectly approached by either pre-analysis concentration techniques or use of relatively abundant indicator substances that obey a known relationship to TEQ values. This paper describes an approach toward the second application through use of lowly chlorinated (one to three chlorines) dioxins as indicator substances. The method of "DLR Jet-REMPI" is briefly described and measurements of unchlorinated dioxin, 2-monochlorodibenzodioxin, and 2,7-dichlorodibenzodioxin are presented. For the third compound, a very favorable detection limit of 0.9 pptv was projected. The indicator approach is further substantiated by measuring actual PCDD/F concentrations in the raw flue gas of a pilot scale, waste burning incinerator and by analyzing these data for correlations between the lowly chlorinated PCDD/F and the TEQ values. The extent to which these correlations are site and industry independent remains to be determined.
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LOWLY CHLORINATED DIBENZODIOXINS AS TEQ INDICATORS. A COMBINED APPROACH USING SPECTROSCOPIC MEASUREMENTS WITH DLR JET-REMPI AND STATISTICAL CORRELATIONS WITH WASTE COMBUSTOR EMISSIONS (PDF, NA pp, 238 KB, about PDF)