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Paper des Monats
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Eingeladener Vortrag
- nein (24)
Im DIN-Normenausschuß NMP 412 wurden in der Vergangenheit verschiedene Verfahren zur Holzschutzmittelanalytik genormt, die vorrangig einige der klassischen Holzschutzmittelkomponenten betreffen. Für die zunehmend auf den Markt drängenden neuen Wirkstoffe fehlen genormte Analysenverfahren. Der Bericht enthält einen Überblick zu gegenwärtig verfügbaren und angewandten Analyseverfahren.
Emissions OECD guidelines
(2004)
Standardized tests for wood preservatives are performed with defined fungal strains to ensure comparability between laboratories. However, changes of virulence and variation of results are well known events. Suitable and reliable measures to control the stability of the test organisms are necessary.Comparison of protein patterns produced by SDS-electrophoresis was already described by several authors as a possible way to identify and to characterize fungal species and strains, i.e. for Serpula, Coniophora and Poria. We compared protein patterns of several strains of Antrodia vaillantii, Poria placenta, Gloeophyllum trabeum, Lentinus lepideus, and Coniophora puteana. Isoelectric focussing and detection of esterase isoenzymes proved to be an alternative method. The investigations resulted in species-specific protein and enzyme patterns. By comparing the strains of single species it was possible to form groups with similar patterns. Possible misidentifications could be detected. The described methods will be further developed and used to follow possible changes in our test strains.
Methods for the determination of biocide emissions from treated materials into water and air were developed and tested in order to support a comparative ecological assessment of biocidal products. Leaching tests, experiments with simulated rain, extraction cleaning of carpets and emission chamber tests were performed with a series of treated materials. The experiments focused on the effect of changes in the procedure as well as characteristics of the specimens and demonstrate the suitability of the proposed methods for biocides of different product types.
It was demonstrated that emissions of biocides into water can be compared on the basis of leaching tests in which the emission kinetics of the active ingredients are recorded. However, the water volume per surface area and the timetable for water changes have to be defined in such tests. Functions of flux rates related to time can be well described for inorganic compounds, whereas modelling of the data is more complicated for organic substances.
Emission chamber tests using 20-litre and 23-litre glass exsiccators, originally developed to study volatile organic compounds, were successfully adapted for the investigation of the emission of biocides from treated materials which are usually semi volatile organic compounds. However, test parameters and the method of analysis have to be adapted to the substances to be determined.
Generally, it was found that the emission curves for the semi volatile organic compounds investigated differ from those of volatile organic compounds.