VDI 3867 BLATT 5
Measurement of particles in ambient air - Determination of the particle number concentration and particle size distribution of aerosols - Time-of-flight spectrometer
| Organization: | VDI |
| Publication Date: | 1 November 2013 |
| Status: | active |
| Page Count: | 27 |
| ICS Code (Ambient atmospheres): | 13.040.20 |
scope:
This standard specifies the use of the time-of-flight spectrometer to determine the particle number concentration and particle size distribution in ambient air. The method is also suitable for characterising test aerosols.
Time-of-flight spectrometers are suitable both for the absolute measurement of the number concentration and for the continuous measurement of the size distribution of aerosol particles. With instruments of this kind, the aerodynamic diameter of particles in their airborne state is directly measured in real time.
Time-of-flight spectrometers are also used in air filter testing, inhalation toxicology, the characterisation of therapeutic inhalers and, in combination with suitable dispersers, in powder technology. Time-of-flight spectrometry as a size-measuring method for single particles is also employed in combination with other measuring methods, e.g. single-particle mass spectrometry.
The measurable particle size range covers aerodynamic diameters from approximately 0,5 μm to approximately 15 μm. Number concentrations of less than 1 cm-3 to approximately 104 cm-3 can be measured.
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