Anhydrosugars in Biomass Smoke Preliminary Data from FLAME 2006

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Presentation transcript:

Anhydrosugars in Biomass Smoke Preliminary Data from FLAME 2006 Guenter Engling Research Center for Environmental Changes Academia Sinica Taipei, Taiwan

Cellulose Degradation Levoglucosan assumed to be sufficiently stable in atmosphere -> longer life time highest conc. of all wood smoke compounds

ANALYSIS SCHEME Quartz Filters Aqueous Extraction Filtration Analysis by HPAEC-PAD Carbon Analysis by Sunset (TOT) Method PM Collectors: - PM2.5 Hi-vol Sampler (1130 L/min.) - Multi-stage Hi-vol Samplers (6-stage cascade impactor) - URG nylon + Teflon filters Gas Collectors: URG denuders (acid + basic gas-phase species)

Advantages: HPAEC-PAD Method High Performance Anion Exchange Chromatography (HPAEC) Ion chromatographic (IC) separation Basic eluent (NaOH) converts anhydrosugars to their anionic form Electrochemical Detection: Pulsed Amperometry (PAD) Application of specific electric potential (voltage) to induce oxidation Measurement of current generated by the released electrons Advantages: Filter extraction with water No chemical derivatization Highly selective and sensitive Wide dynamic range

Anhydrosugar Emission Factors Chamber Burns

Anhydrosugar Emission Factors Stack Burns

Correlation of Levoglucosan with EC Chamber Burns

Correlation of Levoglucosan with EC Stack Burns

Anhydrosugar Emission Factors Rice Straw

Ambient Anhydrosugar Concentrations Event: Rice Field Burning Time: December 2006 Location: Yunlin County, Taiwan - OM/OC Conversion Factor: 1.8 based on reconstructed mass - Turpin: for wood smoke impacted aerosol: 1.9 - 2.3 (aged?!?)

Ambient Levoglucosan Concentrations PM2.5/PM10 Ratios Event: Rice Field Burning Time: December 2006 Location: Yunlin County, Taiwan - OM/OC Conversion Factor: 1.8 based on reconstructed mass - Turpin: for wood smoke impacted aerosol: 1.9 - 2.3 (aged?!?)

Ambient Levoglucosan Concentrations PM2.5/TSP Ratios Event: Rice Field Burning Time: December 2006 Location: Yunlin County, Taiwan - OM/OC Conversion Factor: 1.8 based on reconstructed mass - Turpin: for wood smoke impacted aerosol: 1.9 - 2.3 (aged?!?)