Abstract
Abstract In this study, the extractive contents and the storage-induced emissions from chips of Salix alba, Betula pendula, Populus tremula, and Alnus glutinosa are compared with emissions from Pinus sylvestris chips. Soxhlet extraction was performed, and carbon monoxide (CO) and O2 concentration in the gas phase as well as gas chromatography-mass spectrometry analysis of volatile organic compounds were analyzed. Pinus sylvestris showed the highest extractive content in the petrol ether fraction and emitted CO in the highest concentration. Salix alba, B. pendula, P. tremula, and A. glutinosa have lower extractive contents in the petrol ether fraction and the CO concentrations decreased in the headspace accordingly. The emission of aldehydes was lower in the case of woods with lower petrol ether contents (P. sylvestris, S. alba, and B. pendula), but the situation was not as clear for P. tremula and A. glutinosa. The origin of CO and aldehyde emissions is discussed in view of the possible oxidative degradation processes of lipids and terpenes.
Highlights
The wood consumption is increasing worldwide (Rupar and Sanati 2005; Kuang et al 2008)
A solvent delay was used to increase the lifetime of the detector by discriminating large amounts of CCl2H2/MeOH and this approach restricted the identification of compounds with a linear retention index (LRI) > 800
The pine chips contain a lot of unpolar compounds in the petrol ether and diethyl ether fraction (Table 1; Figure 1) due to their high contents of triacylglyceride (Arshadi et al 2009; Schlechtriem et al 2010) and terpene (Englund and Nussbaum 2000; Banerjee 2001; Granström 2002; Rupar and Sanati 2005; Péres et al 2006)
Summary
The wood consumption is increasing worldwide (Rupar and Sanati 2005; Kuang et al 2008). Softwoods have disadvantages in terms of their high emission of volatile organic compounds (VOCs); this effect is very typical for pinewood (Englund and Nussbaum 2000; Banerjee 2001; Granström 2002). The extractives (accessory compounds), such as terpenes, fats, or fatty acids, undergo oxidative/thermal degradation during production or storage leading to elevated VOC emissions. The background of the present article is the substitution of softwoods by the underutilized hardwoods such as willow, birch, poplar, and alder to diminish the competition in the wood markets in Europe. The study is aiming at the evaluation of the relation between the accessory compound content of woods and their VOC and CO emission properties
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