Two investigations at 22°C and 30°C have been carried out. The electrical resistance in the treated wood and chemical analyses of the remaining amount of unfixed copper, chromium and arsenic were investigated. Samples impregnated with water were used as references. To hold the samples moist during the investigation, each sample was wrapped in a polyethylene plastic foil immediately after impregnation. The electrodes were of acidproof steel. The fixation was also checked by chemical analyses. The result shows that the electrical resistance increases during the fixation, as the concentration of the unfixed metal ions decreases, and that it stabilizes at the same time as there are almost no free unfixed metal ions in the samples. It is therefore possible to measure the fixation by using the electrical resistance given, that the temperature and moisture content in the sample is constant.

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