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http://dx.doi.org/10.5658/WOOD.2016.44.5.743

Prediction of Alkaline Copper Quat (ACQ) Wood Preservative Concentration by Turbidity  

Lee, Jong Shin (Department of Biobased Materials, Chungnam National University)
Kim, Kyoung Tae (Department of Biobased Materials, Chungnam National University)
Choi, Gwang Sik (Institute of Agricultural Science, Chungnam National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.44, no.5, 2016 , pp. 743-749 More about this Journal
Abstract
The concentration control of wood preservatives is necessary to produce a preservative treated wood having a uniform quality. Concentration measurement method of wood preservatives to be easily used in the field has not been developed yet. This study examined the way to estimate the concentration from turbidity of ACQ wood preservative that can be relatively easily measured by using a portable turbidity meter. The addition of phosphoric acid solution in an alkaline ACQ solution having a very low turbidity is created a suspension of the white substance and the turbidity suddenly increased. The optimum amount of addition of the phosphoric acid solution is until the pH of ACQ solution reaches 7, the turbidity of the ACQ solution reaches maximum value. Excessive addition of the phosphoric acid solution results in a turbidity decrease with acidification of the ACQ solution. Also ACQ solution becomes transparent. The high significance was recognized with positive correlation between the concentration and the turbidity of the ACQ solution. From the t-test, The significant difference between the actually measured concentrations and the concentrations predicted by the regression equation for industrial ACQ solutions was not recognized. Thus, it was possible to know that concentration prediction and control of industrial ACQ solution using the turbidity and a regression equation. Therefore, using the regression equation and turbidity is expected to be able to management the concentration of ACQ solution in the industrial field.
Keywords
alkaline copper quaternary wood preservatives; turbidity; concentration; phosphoric acid;
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