In order to investigate the depletion of different CCF-salts during service small stakes (10*10*450mm³) were treated with five water-borne wood preservatives and after fixation brought into ground contact for several years. After failing some of the broken down stakes were used to determine the remaining concentration of relevant ions and their distribution in different segments of the stakes. As expected the content of the components in the stakes decreased with time. Furthermore the results show that the remaining concentration of copper, chromium and fluorine differ depending from the wood preservative used and from the position of the segment in the stake. Only up to 20% of the fluorine was found in the stakes whereas up to 100% of chromium or copper was left. The highest F concentration was determined in the samples when hexafluorosilicate was used in the formulation of the water-borne wood preservative. On the other hand the results show clearly that irrespective of the ion investigated, by far the largest amount was analysed in the fracture zone.

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