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The chemical composition of wood varies from species to species, but is approximately 50% carbon, 42% oxygen, 6% hydrogen, 1% nitrogen, and 1% other elements (mainly calcium, potassium, sodium, magnesium, iron, and manganese) by weight. [31] Wood also contains sulfur, chlorine, silicon, phosphorus, and other elements in small quantity.
The term creosote has a broad range of definitions depending on the origin of the coal tar oil and end-use of the material. With respect to wood preservatives, the United States Environmental Protection Agency (EPA) considers the term creosote to mean a pesticide for use as a wood preservative meeting the American Wood Protection Association (AWPA) Standards P1/P13 and P2. [6]
The composition of lignin varies from species to species. An example of composition from an aspen [8] sample is 63.4% carbon, 5.9% hydrogen, 0.7% ash (mineral components), and 30% oxygen (by difference), [9] corresponding approximately to the formula (C 31 H 34 O 11) n.
The acyclic form of xylose has chemical formula HOCH 2 (CH(OH))3CHO. The cyclic hemiacetal isomers are more prevalent in solution and are of two types: the pyranoses, which feature six-membered C 5 O rings, and the furanoses, which feature five-membered C 4 O rings (with a pendant CH 2 OH group). Each of these rings is subject to further ...
Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions. It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects. Like other copper-based wood preservatives, it ...
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
Pyroligneous acid, also called wood vinegar or wood acid, [3] is a dark liquid produced by the destructive distillation of wood and other plant materials. Composition
An old wood tar oil recipe for the treatment of wood is one-third each genuine wood tar, balsam turpentine, and boiled or raw linseed oil or Chinese tung oil. [citation needed] A boat transporting pine tar barrels on Oulu River in 1910. In Finland, wood tar was once considered a panacea reputed to heal "even those cut in twain through their ...