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Use of X-Ray Fluorescence (XRF) Spectroscopy to Determine 4,5-Dichloro-2-n-Octyl-4-Isothiazolin-3-one (DCOIT) in Wood
2007 - IRG/WP 07-20373
Organic preservative based systems are being developed as replacements for the metal based systems. Typically the chemical actives of organic preservative systems are analyzed using HPLC or GC. However, these analytical techniques require complex sample processing and involve relatively long analysis times. In addition the equipment requires maintenance and a skilled operator. One organic preservative that is currently being developed for a range of uses in wood preservation, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), contains both sulfur and chlorine functionality, providing the potential for the use of XRF for its analysis in both treating solutions and in wood. In this study the applicability of XRF to determine the concentration of DCOIT using the chlorine and sulfur x-ray emissions was determined.
P Walcheski, J Ashmore, D M Laganella
Search for an anti-sapstain treatment for fresh radiata pine wood in compliance with European BPD norms: Field Tests
2015 - IRG/WP 15-30673
In response to the impending restrictions on the use of pesticide active ingredients developed to control the staining of fresh wood, as a result of regulation issued in 2009 by the European Union, a project was proposed to test an alternative anti-sapstain treatment that meets both the European restrictions and the performance required for an export-quality radiata pine fresh wood treatment. A set of 16 treatments that included a positive control (commercial treatment), and an untreated control was set and evaluated at three and six months after the application. The treatments tested included formulations of active ingredients and coformulants, and focused on two anchor treatments: one made with a azole based formulation and another that tested cupric hydroxide as base active ingredient. The results of the initial evaluation is that the active ingredients, at the concentration tested, failed to provide protection over time as required; therefore, at a second follow up trial, other active ingredients were tested, in order to resolve the problem. The second stage of the study incorporated the active ingredient DCOIT, who had shown in studies carried in New Zealand, a potentiating effect of the azole based treatments in the control of the stainer complex in time. The third stage of the study tested different sources of the active ingredient DCOIT, and different concentrations of active ingredients and coformulants, in order to determine a cost competitive and performance effective alternative.
P Montes C, T Hanke W