Electrical Aerosol Detector (EAD) Measurements at the St. Louis Supersite
The Model 3070A Electrical Aerosol Detector (EAD) measures a unique aerosol parameter called total aerosol length. Reported as mm/cm3, aerosol length can be thought of as a number concentration times average diameter, or simply as d1 weighting. This measurement falls between number concentration (d0) and surface area (d2). The EAD is a robust, easy-to-use, low-cost aerosol measurement instrument. It provides fast response and displays data in real time.
An EAD was operated for about two years at the St. Louis supersite. A second EAD was co-located for about 6 months. Information on precision, reliability and consistency will be discussed. Diurnal profiles of the EAD signal for several days, daily averages for several months, and monthly averages for the entire period will be reported.
Correlations of the EAD signal with SMPS measurements of DX for X from 0 to 3 will be reported. Reasons for the correlation being better for X around 1.5 instead of 1.0 will be discussed.
Earlier studies have suggested that the EAD signal is highly correlated with the calculated deposition of particle surface area to the lung. Correlation of the EAD signal with the calculated deposition of particle surface area for several breathing patterns will be presented. The possibility of using the EAD as an indicator of PM surface dose to the lung will be considered.
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