International OCEC Workshop 03/04/03 1 What Organic Compounds Evolve during Thermal Analysis of Carbonaceous Aerosols? Joellen Lewtas, Ph.D Human Exposure.

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Presentation transcript:

International OCEC Workshop 03/04/03 1 What Organic Compounds Evolve during Thermal Analysis of Carbonaceous Aerosols? Joellen Lewtas, Ph.D Human Exposure & Atmospheric Sciences Div. National Exposure Research Laboratory Office of Research & Development Identification of Specific Compounds in Different Temperature fractions of Thermal Evolution Methods

International OCEC Workshop 03/04/03 2 Scientific Basis for Understanding Carbon Fractions Measurement Issues Relationship to Organic Source Tracers for Source Apportionment Basis for Improving Thermal Methods and Standards Why is this a Critical Scientific Issue ?

International OCEC Workshop 03/04/03 3 Obstacles to Addressing this Issue Selection/Standardization of OCEC Protocol(s) Thermal Conditions Definition of Specific Fractions Organic Characterization/Quantification Methods and Standards Integration of Research between the two Scientifc Communities: Thermal Carbon Analysis Organic Chemical Characterization

International OCEC Workshop 03/04/03 4 Approaches to Addressing this Issue Research Initiatives & RFAs (in progress) Organic Working Group (in progress) Possible Future Efforts OCEC Working Group Joint investigations between Organic Speciation & Thermal OCEC

International OCEC Workshop 03/04/03 5 PM Organic Speciation Working Group: Goal Goal: Improve the Characterization and Quantification of Organic Compounds Associated with PM2.5 (Aerosols) Organization/Sponsors: Contact:

International OCEC Workshop 03/04/03 6 PM Organic Working Group: Why? To Improve Source Apportionment using Organic Tracers in Receptor Modeling To Facilitate Quantitative Comparison of Organic Species across Different Airsheds (Supersites) To Improve Aerosol Modeling through accounting for Organic Species To Determine the Role of Organics Species in Health Outcomes

International OCEC Workshop 03/04/03 7 PM Organic Working Group: Approach Develop Standard Reference Materials (SRM) Complex Realistic PM 2.5 SRM Quantification & Calibration Standards Dueterated Standards Identify & Analyze Key Target Analytes Conduct Inter-Laboratory Trials to Develop Consensus & Certified Values Development of Quality Assurance Procedures using Standard Reference Materials

International OCEC Workshop 03/04/03 8 PM Organic Working Group: Participants EPA PM Supersites, Centers & Related Programs (Universities, Research Institutes) Academic Scientists National Labs & other Research Centers Regional and State Laboratories NIST Laboratories EPA Laboratories (ORD, Regions) International (Canada, Europe, Asia) ORNL/NARSTO (data base development)

International OCEC Workshop 03/04/03 9 Status of Working Group Activities Developed Initial Target Analyte List Survey of Organic Sampling Methods Interlab Trial I Results 2002 Interlab Trial II Results 2003 (April Draft Report) In progress: Development of Calibration Standards & Reference Materials Future: Trial III ( )

International OCEC Workshop 03/04/03 10 Initial Target Analytes Source Markers Alkanes, Alkenes, Hopanes, … Aromatics (PAH, Nitro-PAH,…) Oxygenates (Acids, Aldehydes, Ketones, Quinones, Phenols, Sterols…) Toxic Organic Species Polycyclic Aromatic Compounds (PAH, …) Nitro Substituted Compounds Reactive Oxygenates (Quinones,…)

International OCEC Workshop 03/04/03 11 Intercomparison Trials: Reference Materials Trial I (Feb-July, 2001) SRM 1649a sieved to <63 microns Extract of sieved SRM 1649a SRM 1649a Urban Wash DC Particle <125 microns Trial II ( ) Interim Reference Material Baltimore PM 2.5 (20g) Trial III ( ) Bulk Baltimore PM 2.5 for new SRM (goal to collect 200g)

International OCEC Workshop 03/04/03 12 Target Analytes Reported in Trial I 36 PAH 14 Labs 7 Nitro PAH2 Labs 12 Alkanes & Alkenes6 Labs 13 Hopanes, Colestanes, & Sterols5 Labs 18 Carbonyls & Acids 5 Labs Aldehydes, Ketones, Lactones, etc. 8 Phenols none 8 Phenols none

International OCEC Workshop 03/04/03 13 Standards Sub-Groups Quinones & Ketones: - Barbara Zielinska (Lead) Doug Lane, Tony Miguel, Jake McDonald Sugars & Phenols: - Chris Simpson (Lead), Mike Hayes,Barbara Zielinska, Lynn Reinhart Hopanes and stearanes: - Jake McDonald (Lead) Mike Hayes, Barbara Zielinska, Steve McDow, John Offenberg, Wolfgang Rogge Acids: - Mike Hayes (Lead), Lynn Reinhart, Steve McDow, and Tad Kleindienst PAH Derivatives: Janet Arey (lead), Doug Lane, Barbara Zielinska, Chung Chiu, Brian McCarry, Steve McDow, Chris Simpson, Toney Miguel, Jake McDonald, Shao Mei Wong

International OCEC Workshop 03/04/03 14 New Investigations Barbara Zielinska (DRI) Thermal Desorption/Chemical Characterization Temperature Ramps mimicing TOR Fractions Lara Gundel, Kirchstetter, Dod, Pang (LBL) Comparison of thermograms of Specific organic compounds Ambient source Surrogate PM