This document specifies a process for the electrical diffusion charging of aerosols with subsequent
measurement of particle charge. With the aid of this method, it is possible to determine the lungdeposited
surface area (LDSA) concentration of particles in ambient air. Depending on the design of the
electrical diffusion charger, the LDSA of particles in the size range of approximately 20 nm to
approximately 300 nm is measurable.
Furthermore, this document specifies design criteria for LDSA measuring aerosol monitors as well as
performance criteria and the associated test procedures. The performance criteria depend on the
application and they are more stringent when the instrument is operated in an air quality monitoring
station.
In the determination of the LDSA concentration, the share of geometric particle surface area
concentration is determined that can be deposited in the alveolar region of the human lung. Typical
particle surface area concentrations with alveolar deposition measured in urban areas range from
5 μm2/cm3 to 50 μm2/cm3.
Instruments based on this measurement principle can be designed to be very compact with a low power
consumption. This makes them ideally suited for hand-held measurements, other forms of mobile
application or to measure personal exposure. On the other hand, they can be easily adapted to serve as a stationary instrument in air quality monitoring stations.
| File Size : | 1
file
, 3.2 MB |
| ISBN(s) : | 9780539252873 |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 36 |
| Published : | 09/30/2024 |
