Determination of 2-thiocyanomethylthiobenzothiazole (TCMTB) in treated wood and wood preservative using Ultraviolet–visible spectrophotometer

2012 ◽  
Vol 46 (6) ◽  
pp. 1021-1031 ◽  
Author(s):  
K. Tumirah ◽  
S. Salamah ◽  
A. Rozita ◽  
U. Salmiah ◽  
M. A. M. Nasir
Keyword(s):  
Treated Wood ◽  
Wood Preservative

scholarly journals Enhancement of Wood Biological Resistance and Fire Retardant Properties after Laccase Assisted Enzymatic Grafting

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1102
Author(s):  
Cristian Bolaño ◽  
Sabrina Palanti ◽  
Luigi Benni ◽  
Diego Moldes
Keyword(s):  
Silver Nanoparticles ◽  
Flame Retardant ◽  
Toxic Substance ◽  
Treated Wood ◽  
Fire Retardant ◽  
Wood Preservative ◽  
Decay Resistance ◽  
Kraft Lignin ◽  
Fire Retardant Properties ◽  
Wood Surfaces

Several treatments of wood, based on laccase assisted grafting, were evaluated in this paper. Firstly, the efficacy of lignosulfonate and kraft lignin from Eucalyptus spp. as a wood preservative was assessed. Both ligno products were anchored to wood surfaces via laccase treatment in order to avoid leaching. Moreover, some of these wood preservative treatments were completed with the addition of silver nanoparticles. For comparison, a commercial product was also analyzed in terms of its fungal decay resistance during surface application, in accordance to use class 3, CEN EN 335. Secondly, the anchoring of a flame retardant based on tetrabromobisphenol-A (TBBPA) was attempted, to limit the dispersion of this toxic substance from treated wood. In both cases, kraft lignin and lignosulfonate showed an improvement in wood durability, even after leaching. However, the addition of silver nanoparticles did not improve the efficacy. On the other hand, the efficacy of TBBPA as a flame retardant was not improved by grafting it with laccase treatment or by adding O2, a co-factor of laccase.

The determination of arsenic in treated wood

1960 ◽  
Vol 22 ◽  
pp. 96-100
Author(s):  
W.J. Wilson
Keyword(s):  
Treated Wood

Prediction of long-term leaching potential of preservative-treated wood by diffusion modeling

Holzforschung ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 581-588 ◽  
Author(s):  
Levi Waldron ◽  
Paul A. Cooper ◽  
Tony Y. Ung
Keyword(s):  
Diffusion Coefficient ◽  
Treated Wood ◽  
Free Water ◽  
Wood Preservative ◽  
Copper Component ◽  
Equilibrium Dissociation ◽  
Disodium Octaborate Tetrahydrate ◽  
Alkaline Copper Quaternary ◽  
Copper Azole ◽  
Copper Amine

Abstract An approach to modeling leaching and leaching impacts of preservative components from treated wood is presented based on three simple laboratory determinations: the amount of preservative component available for leaching (Le), equilibrium dissociation of preservative into free water in wood (Di) and diffusion coefficients for component leaching in different wood directions (D). In this study, the following inorganic wood preservative systems were investigated: chromated copper arsenate (CCA), the copper component of copper azole (CA) and alkaline copper quaternary (ACQ), and boron in disodium octaborate tetrahydrate (DOT). Aggressive leaching of finely ground wood showed that amounts of preservative compounds available for leaching were highest for borates, followed by copper in copper amine systems and arsenic in CCA, copper in CCA and chromium in CCA. The equilibrium dissociation or solubility of components in free water in the wood was much higher for borates and copper amine, followed by copper and arsenic in CCA and chromium in CCA. Use of the applicable diffusion coefficient (D) and Di or Le values in a diffusion model allows the prediction of total amount leached and emission or flux rate at different times of exposure for products with different dimensions and geometries. The approach was tested and generally validated through application of the model to results of laboratory water spray leaching of full-size lumber samples. The approach explains the rapid leaching of boron compounds (large diffusion coefficient and high initial dissociated concentration) compared to other preservative components and predicts that ACQ will have higher initial leaching rates compared to CCA and CA, but the latter preservatives will continue to leach copper at a measurable rate for a much longer time. The practical implications and limitations of the approach are discussed.

Determination of the Bond Strength of Wood Veneer and Geopolymer Matrix by Means of a Pull-Out Test

2020 ◽  
Vol 981 ◽  
pp. 162-168
Author(s):  
Siti Noorbaini Sarmin ◽  
Wan Mohd Nazri Wan Abdul Rahman ◽  
Nor Yuziah Mohd Yunus ◽  
Nurrohana Ahmad
Keyword(s):  
Picea Abies ◽  
Moisture Content ◽  
Bonding Strength ◽  
Treated Wood ◽  
Uv Absorbance ◽  
Wood Veneer ◽  
Pull Out ◽  
Geopolymer Matrix ◽  
Pre Treatment

The bonding strength of wood veneer (Picea abies) attached between a geopolymer matrixes were investigated by means of a pull-out test. Effects of pre-treatment of wood on the bonding strength were applied whereas a strong influence of pre-treatment on bonding strength could be observed. The treatment of wood veneer showed that using wet veneer (~90% moisture content) leads to the best results compared to untreated dry (~12% moisture content) veneer. Furthermore, the effects of sodium hydroxide extraction and sodium silicate treatment were examined. The lignin UV absorbance values in treated wood, obtained by scanning ultraviolet microspectrophotometry (UMSP), do not show any significant changes in absorbance which mean that there were no complex changes in phenolic wood components, including modification of the lignin side chains. It can be said that the alkaline environment needed for geopolymer was not the main problem that limits wood (Picea abies)-geopolymer compatibility.

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