During the work with European standards for pressure treated wood, it has been questioned if the lapse of time between impregnation and chemical analysis of the retention is critical, especially for creosote. "The Norwegian Control Scheme for Preservative Treated Wood" has not discovered any retention problems analysing CCA preservatives in wood. If the lapse of time between impregnation with creosote and extraction of the creosote in bore cores was within two months, the retention normally met the requirement. If the lapse of time was more than two months, we usually got a lower retention than required. At the control we always take our bore core samples from the upper part of horizontal stored poles. The bore cores are stored for about two days in test tubes sealed with a plastic stopper. In this investigation we analysed the amount of creosote in 2 meter long poles (by extraction described in AWPA A6) at various time intervals during storage for 30 months. We analysed the remaining creosote both in the upper and in the lower horizontal part of the poles. The redistribution found by extraction from the upper to the lower part in the poles during storage was 15-20%. In addition we found in the same period an evaporation of about 10% from the poles.

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