Laboratory experiments on aerial emissions from wood treated with wood stains

IRG/WP 93-50001-06

G M F Van Eetvelde, M Stevens

Due to the actual environmental interest in wood preservation, a series of experiments was carried out on the emission of biocides from treated wood. The research focussed on the volatilization of 5 biocides from boards treated with wood preservative finishes containing dichlofluanide (DCF) azaconazole (AZA), pentachlorphenol (PCP), iodopropynylbuthylcarbamate (IPCB) and tributhyltinoxide (TBTO). Formulations used were solventborne or waterborne and varried from low build to high build types. Treated samples were exposed in a standard emission column to a conditioned air stream and the emitted gasphase was adsorbed on amberlite xad. The chemical compounds were released in an appropriate solvent and subsequently analysed. A distinct variation was observed between the emission results of the different biocidal compounds. The volatilization values decreased in the following order: TBTO > DCF > IPBC > PCP >> AZA Relating the chemical concentration, obtained under various conditions of test to the inherent toxicity of the preservatives, it can be concluded that azaconazole possesses the lowest aerial toxicity potential. PCP and TBTO are considered to possess a lower aerial safety factor, while dichlofluanide and IPBC take an intermediate position. A significant effect of some of the exposure variables used could be noticed e.g. temperature, application dosis and exposure period. Other variables of importance were type of formulation, pre-curing of coating, moisture content and type of wood. As an overall conclusion, the emission tests gave evidence of no real danger for human inhalation toxicity. In none of the conditions used, for any preservative, the level of emission exceeded the maximal aerial concentration, cited in literature.


Conference: 93-02-08/09 Cannes-Mandelieu, France

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