Near-real-time combustion monitoring for PCDD/PCDF indicators by GC-REMPI-TOFMS

The boiler exit flue gas of a municipal waste combustor was sampled to evaluate an online monitoring system for chlorobenzene congeners as indicators of polychlorinated dibenzodioxin and dibenzofuran (PCDD/PCDF) concentrations. Continuous measurements of chlorobenzene congeners using gas chromatogra...

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Veröffentlicht in:Environmental science & technology Jg. 46; H. 2; S. 923
Hauptverfasser: Gullett, Brian K, Oudejans, Lukas, Tabor, Dennis, Touati, Abderrahmane, Ryan, Shawn
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States 17.01.2012
Schlagworte:
Benzofurans - chemistry
Dibenzofurans, Polychlorinated
Gas Chromatography-Mass Spectrometry - methods
Polychlorinated Dibenzodioxins - analogs & derivatives
Polychlorinated Dibenzodioxins - chemistry
Spacecraft
Time Factors
Water - chemistry
Water - standards
Water Pollutants, Chemical - chemistry
ISSN:1520-5851, 1520-5851
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Zusammenfassung:The boiler exit flue gas of a municipal waste combustor was sampled to evaluate an online monitoring system for chlorobenzene congeners as indicators of polychlorinated dibenzodioxin and dibenzofuran (PCDD/PCDF) concentrations. Continuous measurements of chlorobenzene congeners using gas chromatography coupled to a resonance-enhanced multiphoton ionization - time-of-flight mass spectrometry (GC-REMPI-TOFMS) system were compared over 5-min periods with conventional sampling methods for PCDD/PCDF. Three pairs of values were taken every hour over a period of three days to characterize the combustor's response to transient operating conditions (shutdowns and startups). Isolation of specific chlorobenzene congeners from other same-mass compounds was accomplished by using a GC column separator ahead of the REMPI-TOFMS. The 50-fold variation of PCDD/PCDF concentration was paralleled by similar changes in monitored compounds of 1,4-dichlorobenzene, 1,2,4-trichlorobenzene, 1,2,3-trichlorobenzene, and 1,2,4,5-tetrachlorobenzene. A correlation of R = 0.85 and 0.89 was established between 40 pairs of simultaneous 5-min GC-REMPI-TOFMS measurements of 1,2,4-trichlorobenzene and 5 min conventional sampling and analysis for the TEQ and Total measures of PCDD/PCDF, respectively. The GC-REMPI-TOFMS system can be used to provide frequent measures of correlative PCDD/PCDF concentration thereby allowing for an understanding of measures to minimize PCDD/PCDF formation and develop operational feedback to limit emissions.
Bibliographie:ObjectType-Article-1
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ISSN:1520-5851
1520-5851
DOI:10.1021/es2027339