Abstract
We report the performance of a slit virtual impactor at high particle mass concentrations ( > 500 μ g / L ) . Transmission efficiency was determined on an individual particle basis by visualization of fluorescent particles embedded in a background matrix of Arizona road dust. No significant difference in transmission efficiency from dilute conditions was observed for a mass loading of 571 μ g / L . At greater mass loadings ( > 1000 μ g / L ) , the device clogged before a statistically significant data set could be obtained. These results suggest that the performance of a slit virtual impactor is not degraded up to roughly 600 μ g / L , and may be extended to even larger mass loadings provided that clogging of the nozzle is minimized.
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