INTEGRATED COLLECTION AND VAPORIZATION PARTICLE CHEMISTRY MONITORING

摘要

An integrated collection and vaporization apparatus and method are described. The apparatus includes a collector and vaporizer cell (45) with sample gas director (34) and an impaction collector strip (37) located therein. In use particles are collected on the strip (37) followed by rapid heating of the strip with a power source (50) to vaporize the particles. The gases produced are carried to an analyzer (49) by a carrier gas introduced into the cell (45) through the sample gas director (34) and a separate port (23). Prior to entering the cell (45), the sample gas is passed through a pre-impactor (40), denuder (41), and humidifier (42) to remove larger particles and vapors and increase the collection efficiency of the remaining particles. A vented housing (46) maintains the sample gas temperature near ambient. This configuration allows the sample gas to pass through a valve free path to the cell (45).