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Silicone sampling tubes can cause drastic artifacts in measurements with aerosol instrumentation based on unipolar diffusion charging

Aerosol instrumentation based on unipolar diffusion charging has become popular in the recent years. These instruments can be made very small, making them suitable as personal monitors. In many applications, including personal monitoring, the use of flexible sampling tubes is required. We found that... Full description

Contained in: Aerosol Science and Technology Vol. 50, No. 10-12 (2016), p. 1375-1384
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Links: Additional Link (dx.doi.org)
ISSN: 1521-7388
Additional Keywords: AEROSOL
DIFFUSION
GASZUSAMMENSETZUNG
NANOPARTIKEL
SILICON:POLYMER
SILOXAN
TEILCHENDICHTE
DOI: 10.1080/02786826.2016.1241858
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 10 Seiten, Quellen
ID (e.g. DOI, URN): 10.1080/02786826.2016.1241858
PPN (Catalogue-ID): WTI004206517
Note: WTI TEMA DB
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520 |a Aerosol instrumentation based on unipolar diffusion charging has become popular in the recent years. These instruments can be made very small, making them suitable as personal monitors. In many applications, including personal monitoring, the use of flexible sampling tubes is required. We found that degassing from these sampling tubes can alter the gas composition of the aerosol, which changes the ion properties in the unipolar charger. As a result, the particle concentrations, measured with a unipolar diffusion charger are biased. The strongest effect was found with new, conductive silicone tubes, because of the degassing of siloxanes. Results obtained with one miniature diffusion size classifier unit were by a factor of approximately two too low. Partector and Nanoparticle Surface Area Monitor showed in principle the same behavior, but to a lower degree. Other tube materials were found to have even the opposite effect, i.e., the measured concentrations increased, when measuring through a tube. The largest observed increase was, however, only approximately 14%. Tygon tubes were found to be the best compromise considering particle losses and effect on the diffusion charger. 
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