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Measurement of electrokinetic potential to evaluate adsorption of quaternary ammonium salt
1991 - IRG/WP 3672
Measurement of z-potential in the wood treated with preservatives is suggested as a method for determination of the adsorption of preservative to wood. It has been found that measurement of z-potential of wood treated with quaternary ammonium salt type preservatives can be a useful method to determine the adsorptives phenomena of preservatives and by which there is a remarkable differences in the adsorbed condition with the components of preservatives concentration of treating solution, treating time and the elapsed time for streaming potential measurement in wood treated with quaternary ammonium salt type, there were differences in values of z-potential against that of untreated wood with a difference in chemical formula of preservatives, addition of chemicals for polymerization and concentration of treating solution. In case of the wood treated with quaternary ammonium salt with silicon, the treating time to reach the completly adsorbed condition of preservatives was about 3-5 minutes in concentration of below 0.75% and was about 15 minutes in above 1.5%. On the other hand, in adsorption of benzalkonium chloride, it took 15 minutes of adsorbing time in below 0.75% and 7.5 minutes in above 1.5%. Regardless of the extension of elapsed time for measuring, the constant values in z-potential was not obtained in wood treated with quaternary ammoniusalt with silicon, this result was attributable to leaching of preservatives. Whereas, for measurement of wood treated with benzalkonium chloride, it took the measuring time of 15-20 minutes to obtain constant values which mean a stable condition in adsorption.
Yeong Suk Kim