Thoracic fraction

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Convention values for respirable fraction , thoracic fraction and respirable fraction as a function of the aerodynamic diameter according to DIN EN 481

As thoracic fraction ( thoracic fraction ) 7708, the mass fraction of inhaled particles is called, among other things in the standards EN 481 and ISO, which over the larynx penetrate out into the respiratory tract of humans. It is a variable for assessing possible health hazards in the workplace. By convention, the EN 481 standard stipulates that the thoracic fraction is determined by calculating the inhalable fraction : “The percentage [...] of the inhalable convention that is to be collected with an aerodynamic diameter D in micrometers is derived from a cumulative Normal distribution with a median of 11.64 µm and a geometric standard deviation of 1.5. "

Half of all suspended matter particles with an aerodynamic diameter of 10 µm belong to the thoracic fraction. For the definition of the fine dust category PM 10 , reference is made to the fact that it corresponds to the thoracic fraction.

In the DIN 33897 Part 1 standard, the terms "T dust" and "T dust fraction" are used as synonyms for "thoracic fraction".

literature

  • DIN EN 481: 1993-09 workplace atmosphere; Definition of the particle size distribution for the measurement of airborne particles (German version EN 481: 1993). Beuth Verlag, Berlin.

Individual evidence

  1. ↑ DIN ISO 7708: 1996-01 Air quality - Determination of particle size distributions for health-related particulate matter sampling (ISO 7708: 1995). Beuth Verlag, Berlin, p. 3.
  2. ↑ DIN EN 481: 1993-09 workplace atmosphere; Definition of the particle size distribution for the measurement of airborne particles (German version EN 481: 1993). Beuth Verlag, Berlin. P. 4.
  3. ↑ DIN EN ISO 23210: 2009-12 Emissions from stationary sources - Determination of the mass concentration of PM10 / PM2.5 in exhaust gas - Measurement at low concentrations with impactors (ISO 23210: 2009); German version EN ISO 23210: 2009. Beuth Verlag, Berlin. P. 6.
  4. ↑ DIN 33897-1: 2007-06 Workplace atmosphere - Routine method for determining the dustiness of bulk goods - Part 1: Basics. Beuth Verlag, Berlin, p. 6.