Soluble nutrient influences on toxicity and permanence of CCA preservatives in wood

IRG/WP 3144

B King, G M Smith, A Bruce

The influence of soluble carbohydrate and nitrogenous components concentrated at evaporative surfaces of wood on the toxicity and permanence of CCA preservatives has been examined using soil-burial techniques. Nutrient concentrations in lime (Tilia vulgaris Hayne) have been shown to be associated with reduction of toxic limits of preservatives to an extent in which a 100% increase in preservative loading is required to provide adequate protection in the presence of soluble nutrient gradients. Toxic limit reduction was seen to be accompanied by nitrogen increases. The latter were attributed to microbial biomass which suggests a significant involvement of sacrificial colonisation by micro organisms. Preliminary analyses of elemental copper and chrome indicate an associated preservative instability.


Keywords: CCA; CC; FIXATION; HARDWOODS; LEACHING; NITROGEN; NUTRIENTS; PERMANENCE; TILIA VULGARIS; TOXICITY; WEIGHT LOSS; KOOMPASSIA MALACCENSIS; FAGUS SYLVATICA; EUCALYPTUS REGNANS; DIPTEROCARPUS

Conference: 80-05-05/09 Raleigh, North Carolina, USA


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