This part of the project is focussed on leaching from preservative-treated wood obtained by the laboratory test method CEN/OECD draft guideline, February 2003 ”OECD guideline for the testing of chemicals proposal for new guideline XXX. Estimation of Emissions from Preservative-treated Wood to the Environment: Laboratory Method for wood held in the storage yard after treatment and for wooden commodities exposed in Use Class 3 (not covered, not in contact with the ground).” Preservative-treated test specimens are emerged in water. The specimens are immersed two days a week in a 60 days period. On each immersion day 3 immersions are carried out. One sample is immersed in water 18 x 3 times. Each immersion takes one minute. Between each immersion the specimens are stored in climate chambers. Water (emissate) is retained for chemical analysis for active ingredient to determine the leaching. The study includes commercially available organic fungicides using vacuum-pressure treatment as an application method. The preservative used is the preservative used in Nordtest project 1582-02 named M1. The investigation includes two different periods of fixation, one with a long fixation period and one with a short fixation period of the active ingredient before the immersion testing. The results obtained from laboratory testing are compared with the semi-field exposure. The method developed for in-service testing has proved to characterise the leaching behaviour from preservative-treated wood. However, there is no good correlation between field-testing and the CEN/OECD laboratory testing method for the product involved.

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