Filtern
Erscheinungsjahr
Dokumenttyp
Schlagworte
- Geruch (11)
- Bauprodukte (9)
- Emissionen (7)
- VOC (7)
- Odour (5)
- AgBB-Schema (3)
- AgBB-Scheme (3)
- Odour evaluation (3)
- SVOC (3)
- AbBB-Schema (2)
Organisationseinheit der BAM
Messung und Bewertung von Gerüchen aus Bauprodukten für den Innenraum gewinnen vor allem durch den zunehmenden Bau energieeffizienter Gebäude an Bedeutung. Intensive und unangenehme Gerüche werden von Bewohnerinnen, Bewohnern und Angestellten nicht akzeptiert und können auf Dauer krank machen. Bislang stand noch kein allgemein anerkanntes Messverfahren zur Verfügung. Dieses wurde nun in Forschungsprojekten entwickelt, wobei auch konkrete Bewertungsvorschläge zur Zumutbarkeit von Gerüchen gemacht wurden. Das Verfahren ist an die Messung der Emissionen flüchtiger organischer Verbindungen aus Bauprodukten gekoppelt und nutzt Probanden, um die Geruchsstärke (Intensität) und den Geruchseindruck (Hedonik) zu ermitteln. In der Praxis wird das Verfahren nun an verschiedenen Stellen erprobt. Die Bewertung der Geruchsemissionen gibt der Industrie die Möglichkeit, geruchsarme Produkte zu gestalten. Die Kennzeichnung geruchsarmer Bauprodukte mit dem Umweltzeichen Blauer Engel erleichtert Verbraucherinnen und Verbrauchern die Orientierung beim Einkauf.
In this study 50 construction products were tested in emission test chambers according to the requirements of the AgBB-scheme: 7 acrylic and 6 silicone sealants, 6 paste-like synthetic resin plasters, 13 wood based products, 4 adhesives, 5 lacquers, 6 wall paints and 3 further construction products. VOC and odour emissions were tested on the 1st, 3rd, 10th, and 28th day. In addition to the VOC-measurements, a test procedure was developed to evaluate odour emission of construction products.This test is planned to be implemented into the AgBB-Scheme. A direct evaluation by a sensory panel in the emission test chamber was not possible. So the odour samples were collected in 300- litre tedlar bags which were evaluated later. Odour intensity of the samples was compared with different acetone concentrations. Within this study an interlaboratory comparison was conducted using the newly developed odour test method. Additionally, VVOC emissions, detection of carcinogenic compounds, repeatability of emission test chamber tests, and other issues are presented. This project has shown that construction products can be evaluated in accordance with the AgBB scheme. A sensory evaluation is intended to be introduced in the AgBB scheme. A method for this evaluation is described in this study. The test procedure should be enhanced and validated for practical utilisation.
The concept of a ‘plastisphere microbial community’ arose from research on aquatic plastic debris, while the effect of plastics on microbial communities in soils remains poorly understood. Therefore, we examined the inhabiting microbial communities of two plastic debris ecosystems with regard to their diversity and composition relative to plastic-free soils from the same area using 16S rRNA amplicon sequencing. Furthermore, we studied the plastic-colonizing potential of bacteria originating from both study sites as a measure of surface adhesion to UV-weathered polyethylene (PE) using high-magnification field emission scanning electron microscopy (FESEM). The high plastic content of the soils was associated with a reduced alpha diversity and a significantly different structure of the microbial communities. The presence of plastic debris in soils did not specifically enrich bacteria known to degrade plastic, as suggested by earlier studies, but rather shifted the microbial community towards highly abundant autotrophic bacteria potentially tolerant to hydrophobic environments and known to be important for biocrust formation. The bacterial inoculates from both sites formed dense biofilms on the surface and in micrometer-scale surface cracks of the UV-weathered PE chips after 100 days of in vitro incubation with visible threadlike EPS structures and cross-connections enabling surface adhesion. High-resolution FESEM imaging further indicates that the microbial colonization catalyzed some of the surface degradation of PE. In essence, this study suggests the concept of a ‘terrestrial plastisphere’ as a diverse consortium of microorganisms including autotrophs and other pioneering species paving the way for those members of the consortium that may eventually break down the plastic compounds.
Indoor air pollutants influence the health and comfort of building occupants and consequently the energy consumption of the building. The pollutants are emitted by various sources.
Among these sources, building products are of particular importance. To control the emission of pollutants from building materials, a few different voluntary labelling Systems have been introduced in Europe. In Germany also mandatory “Principles for the health assessment of construction products used in interiors” have been applied for the technical approval of floor coverings since 2004. This procedure is based on the assessment scheine of the Committee for Health-related
Evaluation of Building Products (AgBBScheme). The sensory-limit settings for building-material label Blue Angel offer consumer to differ not only low-emission but also low-odour Building materials from another building materials.
Product emissions chamber testing involves a complex protocol with several sources of measurement uncertainty (ASTM, 2010; ISO, 2006). Despite the potential for significant variability in measurement results within and among laboratories, there is no Standard method available to assess the accuracy of emissions chamber test results. Recently, Germany’s Federal Institute for Materials Research and Testing (BAM) started a program to evaluate the performance of laboratories testing for the AgBB (German Committee for Health-related Evaluation of Building Products) labelling scheme (Wilke et al., 2009). Test method validation was conducted through interlaboratory studies (ILS) with over 30 participants. Simultaneously, the National Institute of Standards and Technology (NIST) and Virginia Tech (VT) started a program to develop a series of reference materials that mimic real building products, can be tested in typical emissions chambers, and have independently known emission rates (Cox et al., 2010). BAM, NIST and VT subsequently joined forces to conduct a series of inter-laboratory studies using the prototype reference material. A pilot ILS was conducted with BAM and NIST followed by an expanded ILS with several participating countries. Results from these interlaboratory studies have the potential to define an internationally-accepted Standard approach to validate results from product emissions tests.
Um eine gute Luftqualität in Gebäuden zu erreichen, müssen Reinigungslasten durch Lüften aus Räumen abgeführt bzw. vermieden oder verringert werden. Wird der Luftwechsel verringert, verschlechtert sich die Raumluftqualität, und die Zufriedenheit der Nutzer nimmt ab. An Arbeitsplätzen kann es bei schlechter Luftqualität und der daraus resultierenden Unzufriedenheit zu einer geringeren Produktivität der Beschäftigten kommen. Um die Reinigungslasten und deren Wirkung auf den Raumnutzer überdas Geruchsempfinden zu verringern, ist neben einer messtechnischen Erfassung der Verunreinigungen auch eine sensorische Prüfung in Innenräumen und von Bauprodukten notwendig. In diesem Artikel wird die Entwicklung der Bewertungsmethodik von Gerüchen im Innenraum erläutert und auf Anwendungen eingegangen.