This technology is a method and apparatus for the semi-continuous measurement of the concentration of constituents of airborne particles which couples a laminar flow, water condensation particle collector to a microfluidic device for assay of particle chemical composition by electrophoresis. The technology has been used for the assay of sulfates, nitrates, chlorides, and organic acids contained in fine and submicrometer atmospheric particles. For these compounds the apparatus and method described is capable of one-minute time resolution at concentrations at the level of micrograms of analyte species per cubic meter of air. Extension to other analytes is possible.
This invention was made with government support under the following Grant Nos: U.S. Dept. of Energy STTR Phase II Grant #DE-FG02-04ER-86179; and U.S. National Science Foundation Grant #ATM-0737201 The government has certain rights in the invention.