Leaching from field test stakes. Part 2: The distribution in and leaching from different parts of test stakes

IRG/WP 94-50026

F G Evans, B Nossen, M-L Edlund

Field test stakes treated with Boliden K33 (copper, chromium and arsenic) and Cuprinol Tryck (CT86) (copper and N-alkylbenzyldimethylammoniumchloride) respectively were exposed in ground contact at two different test fields in Sweden and rejected due to decay after 2 to 28 years. Stakes treated with the same preservatives were also exposed during 7 years above ground. The test stakes have been analysed regarding remaining preservatives in different parts of the stakes. As a reference, unexposed stakes were analysed regarding retention and gradient of the two preservatives in the stakes. There was a gradient in the concentration of preservatives in the unexposed stakes, the gradient being greater for CT86 than for CCA. The remaining preservatives in stakes treated with CCA and CT86 differ depending on preservative used and how they were exposed in the field. Least preservative was found in the end grain and there was an indication of a redistribution of preservatives from the inner part of the stakes to the outer part. Leaching from stakes exposed horizontally above ground was not less than that from stakes in ground contact.


Keywords: BOLIDEN K33; CCA; FIELD TEST; LEACHING; REDISTRIBUTION; CUPRINOL TRYCK

Conference: 94-05-29...06-03, Nusa Dua, Bali, Indonesia


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