Photothermal Deflection Spectroscopy of Collected Aerosols

Photothermal Detection of Condensed Aerosols* Why aerosols?– Increasing awareness of health risks due to PM 2.5 or less– Increasing amounts with anthropogenic origin– Implications in public health and safety– Environmental regulations What aerosols?– Natural Smoke, Salts (NaCl(NaCl), Clay Minerals (dust, clay)– AnthropogenicAmmonium Nitrate, Pesticide Sprays, Exhaust Smoke, Smog Why photothermal?– Sensitivity– Complex matrix– Difficult analysis– In Situ analysis more accurate* Initial collaboration with James Amonette, Tom Autrey and Nancy y Foster-Mills, Pacific Northwest Laboratory