A Comparison of Gravimetric and Photometric Aerosol Samplers
UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD F EDWARD HEBERT SCHOOL OF MEDICINE
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This study compared gravimetric and photometric aerosol sampling instruments for determining airborne concentrations of particulate matter. The instruments used were 1 the SKCR Deployable Particulate Sampler DPS that collects a sample on a filter, which is gravimetrically analyzed for concentration of mass, and 2 the TSIR DustTrakTM 8520 and SidepakTMAM510 that use photometry to estimate airborne particulate concentration. The capability to use these samplers interchangeably would permit employment of the best-suited instrument based on logistical and mission parameters for military force health protection. The instruments were deployed at Yuma Proving Grounds, Arizona for testing and were used in side-by-side sampling over a period of 13 days. Three statistical analyses, Pearson correlation coefficient, correlation within means, and the Bland-Altman analysis were used to compare the derived data. Statistical interpretation of the data between the DPS and the DustTrak at the PM10 cut-point found a strong correlation of data using the metric devised for this study measuring the strength of a relationship between two variables. Analytical comparisons for the DPS and DustTrak at the PM2.5 cut-point demonstrated a weak relationship. The analysis between the DPS and the SidePak was not possible as the power source did not enable the Sidepak to sample for a twentyfour hour period and thus the samples collected were not comparable. A requirement exists for further laboratory and field studies.
- Physical Chemistry