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Gas

Why is gas/particle partitioning important?. Dispersion of Pollutants Introduced into the Atmosphere as Determined by Residence Times(Husar and Patterson, 1980). Washout by rain:. Washout consists of capture of gas and particle phasesGases equilibrate with rain via Henry's Law (reversible air-water exchange)Particles are irreversibly capturedFor PCBs: Wg ~ 200-400, Wp ~ 104

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Gas

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    1. Gas/Particle Partitioning

    3. Washout by rain:

    4. Atmospheric reactions

    5. Background of gas/particle distribution

    6. How do we measure G/P partitioning?

    7. Denuder

    8. Impactor

    9. Cyclone

    10. sampling artifacts?

    11. Theory: adsorption vs. absorption

    12. Particle phase concentration dynamics?

    13. If absorption is important, Koa may be a better predictor of Kp

    14. Adsorption

    15. Surface area of particles

    17. Temperature dependence

    18. Adsorption: Pankow 1987

    19. Absorption: Pankow 1994

    20. What is observed in the field?

    21. Mader and Pankow, 2002

    22. difference between PAHs and PCBs in same air mass sampled twice July 22-23, 1994

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