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SO 2 Precursor Gas Monitoring Training Overview

Learn about methodology, field test results, calibration responses, and Burden’s Creek SO2 frequency distribution. Understand instrument operations and the need for highly-sensitive ambient monitors for emission strategy development and health effect studies. Explore trace level sampling challenges and available trace-level SO2 options.

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SO 2 Precursor Gas Monitoring Training Overview

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  1. SO2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning and Standards

  2. Outline • Methodology • Field test results • Responses to Calibrations • Burden’s Creek SO2 Frequency Distribution • Instrument Operations • Summary

  3. Why measure trace levels of SO2 Objectives: • Emission strategy development • Effectiveness of reduction strategies • Validation of SO2 and sulfate modeling predictions • Long term trends analysis • Health effect studies Need highly-sensitive ambient monitors deployed around these areas to determine CAIR’s effect on SO2 and related species.

  4. Trace Level Sampling Challenges (SO2) • Performance challenges • Lower noise for reduced LDL/MDL • Reduced zero and span drift • Increased rejection of interferences • Trace level modifications • Special band-pass filter to increase NO rejection • Improved light baffling to reduce stray light • More powerful UV source lamp • Higher detector sensitivity • Longer optical bench

  5. Methodology (UV Light Path) SO2 + hv214nm SO2* SO2* SO2 + hv330nm

  6. Methodology (General Schematic) General Diagram of a Precursor Gas SO2 Analyzer

  7. Currently Available Trace-Level SO2 Options Teledyne-API 100EU EQSA-0495-100 Thermo Electron 43C-TLE EQSA-0486-060 (new model: 43i-TLE) Ecotech EC9850T EQSA-0193-092

  8. Testing Results – FieldApril 2006

  9. Recertified Environics calibrator

  10. Recertified Environics calibrator ?

  11. Burdens Creek – Ambient Concentrations Span Level Precision Level

  12. Burdens Creek – Ambient Concentrations

  13. Thermo 43C-TLE Diagnostic Parameters (5-11-07)

  14. Instrument Operation

  15. Interferences • Hydrocarbons • Fluoresces in a fashion similar to SO2 when exposed to UV light • Removed through the hydrocarbon “kicker” • Nitrogen oxide • NO fluoresces in a spectral range close to SO2 • Band pass filter enhances NO rejection

  16. SO2 Response due to NO interference

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