Relationship between nominal retention and distribution of CCA preservative in treated yaang wood
1989
Vichnee Boonyapatipark
CCA is the wood preservative which is water-soluble toxic inorganic salts type. Its composition is copper sulfate, potassium dichromate and arsenic trioxide. Wood preservation improves durability and prevent deterioration by organism. For example, Yaang wood (Dipterocarpus spp.) for construction is usually treated before use. The natural durability of Yaang wood is average 4.3 years. Addition of durability is 4-5 times after proper condition treatment. The atomic absorption spectrophotometer (AAS) is one of the methods which is useful for determining quantity of preservatives present in wood. The wood flour is treated with chemical reagent for digestion. This process in oxidation and wood component is changed to solution. This investigation of CCA treated Yaang wood is to determine the difference in quantity of Cu, Cr, As remained in wood subject to the varying pressure periods of 1, 2 and 3 hours (the variated condition). The quantity of copper and chromium all conditions for wood size 76 mm. x 76 mm. but wood size 100 mm. x 100 mm. is significant. Both of wood sizes are non significant in the section of wood timber. Relationship between nominal retention and distribution of dry salt in CCA treated Yaang wood, is determined by Pearson product moment correlation coefficient (r), is significant.
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