Affiliation:
1. Institut für Berufswissenschaften im Bauwesen, Leibniz Universität Hannover , Herrenhäuser Str. 8 , 30419 Hannover , Germany
Abstract
Abstract
Apart from some strongly fluorescent wood species, the general fluorescence of wood has long been ignored. Recent studies suggest that each species has a distinct fluorescence, originating from both basic components and characteristic extractives. However, wood colour and fluorescence rapidly change upon exposure to sunlight. In this study, 288 samples of Acer pseudoplatanus, Quercus robur, Picea abies and Juglans nigra were irradiated with different bands of ultraviolet (UV) and visible (VIS) light. Photosensitivity was examined in regards of colour, infrared absorbance (FTIR), and fluorescence imaging. UV light caused strong yellowing in all examined species, mostly correlating with lignin degradation, carbonyl formation and the appearance of a broad banded fluorescence emission. VIS light above 420 nm, however, caused different, partly contradicting effects in colour and fluorescence, and did not affect lignin. J. nigra proved to be most sensitive towards VIS-induced yellowing and bleaching. The main new finding of this study is that the native long wave fluorescence of wood was strongly decreased by VIS-irradiation above 510 nm wavelength in all samples. This effect was not species-specific, probably originating from a cross-species wood component. The results have potential impacts on non-destructive image-based evaluation methods and wood identification.
Reference56 articles.
1. Antikainen, J., Hirvonen, T., Kinnunen, J., and Hauta-Kasari, M. (2012). Heartwood detection for Scotch pine by fluorescence image analysis. Holzforschung 66: 877–881, https://doi.org/10.1515/hf-2011-0131.
2. Avella, T., Dechamps, R., and Bastin, M. (1988). Fluorescence study of 10,610 woody species from the Tervuren (Tw) Collection, Belgium. IAWA J. 9: 346–352, https://doi.org/10.1163/22941932-90001094.
3. Baur, S.I. and Easteal, A.J. (2014). ESR studies on the free radical generation in wood by irradiation with selected sources from UV to IR wavelength regions. Holzforschung 68: 775–780, https://doi.org/10.1515/hf-2013-0185.
4. Beyer, M., Müller, M., Scheiding, W., and Emmler, R. (2012). Grundlegende Untersuchungen zum Verhalten von Oberflächen aus Thermoholz und dunklen nativen Hölzern bei Bestrahlung. Holztechnologie 53: 18–23.
5. Bianco, M.-A., Handaji, A., and Savolainen, H. (1998). Quantitative analysis of ellagic acid in hardwood samples. Sci. Total Environ. 222: 123–126, https://doi.org/10.1016/S0048-9697(98)00294-0.
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