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GRIMM EDM365-SVC |
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IntroductionThe company GRIMM Aerosol Technik GmbH & Co. KG is worldwide known as the expert for development, production and distribution of the latest equipment to measure particles in the atmosphere. For 30 years we have pioneered compact and mobile Aerosol Spectrometers, initially to measure dust concentrations for work environment and indoor applications. This GRIMM Enviro-family of products has now been extended by the 365-SVC. |
Newsletter 4, 2011![]() Dr. Markus Pesch |
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The EDM365-SVC (Environmental Dust Monitor 365 Semi-Volatile Compounds)The new device is technically based on the proven and robust GRIMM Environmental Dust Monitor EDM365 and has been designed to specifically determine the Semi Volatile Compounds – SVC in the environment. A unique feature is to measure the mass fractions TSP, PM10, PM2.5, and PM1, as well as particle counts, and in addition the correlated fraction of the semi-volatile dust components. Picture 1 shows the EDM365-SVC in action at a rural site (Ainring, Bavaria). ![]()
Picture 1: The EDM365-SVC during measurements at Ainring (Bavaria)
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What are semivolatile compounds?
SVC are semi-volatile compounds of dust, that co-exist at outdoor temperature ranges in solid, liquid, and gas phases. These substances are mainly nitrate and ammonium compounds as well as organic substrates. The SVC are largely not emitted directly, but come predominantly via photochemical reaction from gases, such as sulphur dioxide, nitrogen oxide, and organic carbon compounds into existence in the atmosphere. These precursor substrates are emitted worldwide in combustion processes, such as power plants, automotive industries, or production in general. Even natural sources such as oceans and woods emit significant amounts of precursor substrates of the SVC. |
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Determination of SVC
Analysis in the Lab |
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Measurement Technique made by GRIMM
The new approach of GRIMM is based on measuring particles via two different probe inlet paths; one is the proven and known GRIMM Nafion dryer without the loss of particles and semi-volatile particles, the other one uses in addition a heated sampling probe head prior to the optical measurement. |
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What is the benefit of the GRIMM SVC-Measurements?
Due to the high time resolution and a continuous measurement of the SVC fraction, a detailed surveillance of the air quality, i.e. of industrial plants or farming is possible. |
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Examples
Picture 2 shows a measurement of particle mass, carried out with the EDM365-SVC. Over time, clear differences may be observed due to the SVC fraction. Apparent is the size dependence of the SVC fraction. Particularly, the losses in the PM2.5 and PM1 fraction are obvious (valley of the green and blue line). ![]()
Picture 2: Measurement of the particle mass with EDM365-SVC
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Picture 3: Measurement of the particle counts with EDM365-SVC
Picture 4 shows the particle mass distribution and the corresponding SVC fraction. Most significant are the losses of small particles in the range between 265 nm and approx. 500 nm due to heating; apparently the SVC fraction is very high. In the coarse dust fraction the losses are visible, however not as much as in the fine dust fraction. These particles contain less SVC in relation. ![]()
Picture 4: Measurement of the particle mass distribution with the EDM365-SVC
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Abbestellen: Web: Bitte hier klicken Email: sb@grimm-aerosol.com Telephone: +49 8654 57812 Fax: +49 8654 57835 |
Adresse: Grimm Aerosol Technik GmbH & Co. KG Dorfstrasse 9 83404 Ainring Deutschland |
Recht: Vertreter: Dr. Hans J. Grimm Registergericht: Traunstein Registernummer: 4803 |