Description: Das Projekt "Einfluss von Temperatur und Feuchte auf die Bestimmung von Partikelmassenkonzentrationen fuer Vergleichsmessungen" wird vom Umweltbundesamt gefördert und von Universität Duisburg, Fachbereich 9 Elektrotechnik, Fachgebiet Prozess- und Aerosolmesstechnik durchgeführt. The discussion about the particulate matter measurement is revived by the information that an increasing fine particle concentration in the atmosphere increases the mortality rate. The new PM (Particulate Matter) standards for the measurement of particles less than 10 my m, 2,5 my m or even less then 1 my m will be discussed in European countries. The development of standards towards smaller particle sizes increases the importance of eviting artifacts during sampling and conditioning. Atmospheric aerosols consist of a combination of different substances such as organic and for a considerable part, in view of the mass concentration, of inorganic particulate matter. The artifact characteristics depends for volatile and hygroscopic salt particles on temperature and bumidity. Ammonium nitrate and sulfate are representative in the study for theoretical and experimental modeling of volatilization characteristics during sampling and conditioning. Ammonium nitrate is of volatile nature while both of them are of hygroscopic nature. All standards up to now recommend to collect particles with a filter at the thermodynamic state of atmospheric aerosols, to condition it at a certain temperatureand relative humidity and to weight it off-line. In such a method the aerosol concentration is changed because of evaporation takingplace at the filter and further changes during conditioning. The latter ones can be avoided by using a quasi on-line measuring balance like the Tapered Element Oscillating Microbalance-TEOM. Since the thermodynamic state of the aerosol may change during sampling the measured aerosol concentration can be different depending on the history of the thermodynamic state during sampling. We are investigating in how far heating the aerosol to temperatures above the highest possible ambient temperatures changes the mass concentration, whether there are possibilities to correct for this effect and how it affects the dependency of the collected particle mass of the thermodynamic state of the aerosol. Loading experiments and evaporation studies - are performed using a filter in a TEOM and using defined aerosols such as e.g. ammonium nitrate.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Duisburg ? Ammoniumnitrat ? Ammoniumsulfat ? Gesundheitsgefährdung ? Sulfat ? Atmosphärisches Aerosol ? Temperaturabhängigkeit ? Thermodynamik ? Salz ? Aerosol ? Elektrotechnik ? Feinstaub ? Filter ? Partikelgrößenverteilung ? Anorganische Verbindung ? Verdunstung ? Luftverschmutzung ? Organische Verbindung ? Bilanz ? Schadstoffanalyse ? Studie ? Volatilität ? Stoff ? Modellierung ? Effektkonzentration ? Partikel ? Heizung ? Feuchtigkeit ? Atmosphäre ? Particulate-Matter ? Off-Line-Betrieb ? Vergleichsmessung ? TEOM ? Teilchenkonzentration ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1995-01-01 - 1996-04-30
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