Δa* and Δb* of walnut wood (Juglans nigra L.) treated with acid and alkaline buffers and UV-A light irradiation
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2015, Vol 91, Issue
Abstract
Δa* and Δb* of walnut wood (Juglans nigra L.) treated with acid and alkaline buffers and UV-A light irradiation. A study on parameters a* and b* of walnut wood (Juglans nigra L.) by buffer treatment and then by UV-A light irradiation has been carried out. Eight types of buffers were used in the tests. Four acid (pH = 2.0, 3.0, 4.0, 5.0), one neutral (pH = 7.0), and three alkaline (pH = 8.0, 9.0, 10.0). Two types of lamps were used in the tests, i.e. a UVA-340 lamp with a wavelength of 290 - 400 nm, emitting light resembling natural light, an a UVA-351 lamp with a wavelength of 300 400 nm, imitating light found indoors penetrating through window panes. The parameters a* and b* of the samples were measured using a Datacolour 600 spectrophotometer after buffer treatment which lasted 24h and then after light irradiation which lasted 100h. It was detected that the samples of walnut wood after treatment with the acid buffer and then exposed to the outdoor and indoor light irradiation became less red and after treatment with the alkaline buffer more red. Moreover, the parameter b* in the case of detected species of wood is more sensitive to indoor light irradiation in comparison to outdoor light irradiation.
Authors and Affiliations
MAGDALENA ZBOROWSKA, WŁODZIMIERZ PRĄDZYŃSKI, AGATA STACHOWIAK-WENCEK, BOGUSŁAWA WALISZEWSKA, HELENA BIERNAT
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