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- Formaldehyde (2)
- Building product (1)
- Difenoconazole (1)
- Dynamic scanning calorimetry (1)
- Emission chamber testing (1)
- Emission test chamber (1)
- Foam tiles (1)
- Metformin (1)
- OSB (1)
- Particle board (1)
Wood-based materials are well-known sources for formaldehyde emission in the indoor environment. Different testing standards lead to different emission values for the materials. Such standards are compared in this study. Besides scenarios with varying loading factors, air exchange rates and climatic conditions were investigated to evaluate the formaldehyde emission potential of different building products.
Under realistic indoor conditions used for the emission chamber tests, exceeding of formaldehyde indoor guide values were obtained. Results showed the need for improvement of wood-based materials with lower formaldehyde emissions and the adaption of testing parameters closer to realistic conditions.
Acoustics is an important aspect for large rooms especially in schools, kindergartens and offices. Foam tiles made from melamine resins are often used for acoustic insulation because they show good fire resistance and good thermal insulation properties. But they can emit formaldehyde. In Germany there are cases with a resulting indoor air concentration of higher than 100 µg/m³. In this study samples from two schools and one office were investigated. Additionally, new tiles were purchased and tested to evaluate the general potential as formaldehyde source.
A first pilot study on the sorption of environmental pollutants on various microplastic materials
(2017)
With the drastic increase in plastic production, the input of plastic particles into the environment has become a recognised problem.
Xenobiotics are able to sorb to polymer materials, and this process is further enhanced where they Encounter microplastics (plastic fragments <5 mm). In this work we studied the sorption of metformin, a type-2 diabetes drug, and difenoconazole, a fungicide, onto the virgin polymer materials polyamide (PA), polypropylene (PP), and polystyrene (PS). Additionally, PP was cryo-milled and PA was treated with acid to investigate the influence of an increase in surface area and chemical modification. The material properties were also studied by dynamic scanning calorimetry (DSC), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). Sorption experiments were performed on the basis of a full factorial design examining the effect of agitation, pH value, and salinity. Experimental results showed that difenoconazole sorbs readily to all microplastics, whereas the more polar analyte metformin did not show any affinity to the materials used. For difenoconazole the governing factor in all cases is agitation, while both pH and salinity exhibited only a slight influence. The modification of polymers leads to enhanced sorption, indicating that an increase in surface area (cryo-milled PP) or inner volume (acid-treated PA) strongly favours adsorption. Moreover, long-term experiments demonstrated that the time until equilibrium is reached depends strongly on the particle size.