Time-resolved chemical characterization of aerosol particles down to 6 nm diameter in Stockton, California

A versatile and compact sampling system has been developed to collect sequential time-resolved, dry aerosol particles down to 6 nm in diameter. Using the same technology as in the water-based condensation particle counters this system collects and deposits dry samples of ambient fine and ultrafine particles in 1mm spots. The size of the deposition area allows reducing collection times by increasing the concentration of particles in the 50-100 μl volume of solvent used to extract the chemicals of interest.