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Chemical analysis of TnBTO in lap-joints

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Author: Voss, A. · Esser, P.M. · Suitela, W.L.D.
Institution: TNO Bouw
Source:30th Annual Meeting of the International Research Group on Wood Preservation, Section 2: Test Methodology and Assessment, Rosenheim, Germany, 6-11 June, 1-13
Identifier: 329453
Keywords: TnBTO · Lap-joints · Chemical analysis · Field tests


This research was performed as part of the EU project FACT (contract SMT4-CT96-2135) on field tests out of ground contact and ageing methods. The results reported here are part of the work on the experimental lap-joint standard (ENV 12037). TNO investigated the TBTO content of 32 lap-joints by analysing the tin content of 90 samples. The lap-joints were treated with two different TBTO-concentrations (0.5%; 1.0%) and different treatment methods (brushing, dipping, vac-vac treatment). Analysis took place after initial treatment and 6 months after field testing above ground at differ-ent test sites in Europe. The samples for analysis were taken from the top layer (first 3 mm) and from the inner part of the lap-joint. Preliminary tests with different extraction methods (AWPA, CTBA and DPI-FS) for tin analysis in wood showed the highest recovery rates for the AWPA method. Therefore extraction of the wood samples was carried out in accordance to the AWPA-A6-89-4 method. The extracts were analysed by ICP-AES. Results of the tin analysis are discussed referring to field test site . treatment method and sample origin.