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Three species of wood (larch, beech and red oak) were boiled in alkaline liquids. Wood species were divided into three groups for 30 samples each (the same average density and standard deviations). Samples were boiling in two types of liquids – seawater and black liquor. Time of boiling was always 20 hours. The density before and after treatment were measured also was investigated compressive strength...
Impact of environmental pollution caused by sulphur mining on the chemical composition of wood and bark of birch (Betula pendula Roth.) Content of extractives, cellulose, !% NaOH soluble substances and lignin were examined. Samples were gained from cca. 70-year old birch (Betula pendula Roth.) grown in the environment polluted by sulfur mining industry. 200mm height disks were cut in the butt-end,...
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