Size Selective Real-Time Gravimetry of Small Airborne Particles

The need for environmental monitoring becomes more and more evident on the background of new knowledge concerning noxious effects of fine and particularly ultra fine particulate matter. But in fact measuring the mass of particular matter in gases or air is very difficult.

Optical measurement procedures often are adapted to known compositions of particular matter or well suited for particle counting. Truly gravimetric procedures are expensiv. The related instruments need routine maintenance. Only very special instruments can perform real-time measurements. At the department of physical chemistry of the University of Göttingen there is a real-time cascade impactor in use. It performs high sensitive, strictly gravimetric measurements. It is service reduced with the potential to become maintenance-free.

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