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Reproducibly emitting reference materials for volatile and semi-volatile organic compounds - using finite element modeling for emission predictions

: Mull, B.; Sauerwald, T.; Schultealbert, C.; Horn, W.; Brödner, D.; Richter, M.


Air quality, atmosphere and health 10 (2017), No.10, pp.1237-1246
ISSN: 1873-9326
ISSN: 1873-9318
Journal Article
Fraunhofer WKI ()

Recent research into emissions of (semi-)volatile organic compounds [(S)VOC] from solid materials has focused on the development of suitable reference materials for quality assurance/quality control of emission test chamber measurements, which fulfill requirements such as homogenous and reproducible (S)VOC release. The approach of this study was to find a method for preparation of a material with predictable (S)VOC emission rates. A VOC (styrene) and an SVOC (2,6-diisopropylnaphthalene, DIPN), loaded into either vacuum grease or a 1:1 mixture of paraffin/squalane, have been tested. For the prediction of the emission rates, a model using the finite element method (FEM) was created to simulate the (S)VOC emission profiles. Theoretical and experimental results obtained in a Micro-Chamber/Thermal Extractor (μ-CTE™) and in 24 L emission test chamber measurements were in good agreement. Further properties were investigated concerning the material applicability, such as shelf life and inter-laboratory comparability. The maximum relative standard deviation in the inter-laboratory study was found to be 20%.