Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Deflection Spectroscopy of Collected Aerosols Photothermal Deflection Spectroscopy of Collected Aerosols
Summary and ConclusionsSummary and Conclusions Aerosol photothermal deflection spectroscopy is a sensitivemethod that may be used to perform in situ atmosphericanalysis The detection limit from the signal-mass curve was 7.3 ng Aerosol mass concentration is calculated from theseexperiments demonstrated a detection limit of 0.65 μg/m 3for 30 L/min flow over a 30 min collection time This is much better than the current technology using“sample and weigh”. As with most aerosol analysis methods, knowledge of theparticle composition is needed to calculate μg/m 3 fromsignal.
Future Aerosol Work We need to us an in situ apparatus to measure aerosolconcentrations side-byby-side with “conventional” equipment. In terms of understanding the signals, we need to answer– How cooperative heat transfer effects in high-sample surface density– Can we use the time-dependent signals to determine aerosol thermaland absorbance properties? Finally, can we obtain multiple aerosol signals that are asprecise as the individual aerosol measurements?
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- Page 21 and 22: Size and Number Calibration Aerosol
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- Page 25 and 26: Aerosols Number Concentration100908
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- Page 41: Acknowledgements Several persons wo
Summary and ConclusionsSummary and Conclusions Aerosol photothermal deflection spectroscopy is a sensitivemethod that may be used to perform in situ atmosphericanalysis The detection limit from the signal-mass curve was 7.3 ng Aerosol mass concentration is calculated from theseexperiments demonstrated a detection limit <strong>of</strong> 0.65 μg/m 3for 30 L/min flow over a 30 min collection time This is much better than the current technology using“sample and weigh”. As with most aerosol analysis methods, knowledge <strong>of</strong> theparticle composition is needed to calculate μg/m 3 fromsignal.
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