Automatic Respiration Analysis of the Fungitoxic Potential of Wood Preservatives, Including An Oxathiin

The fully automated gas-chromatographic method for measuring respiration-threshold retentions (RTR) for wood preservatives is described. The RTR method is more sensitive to fungal attack than is the normal weight-loss method (WLTR). It provides RTR values in 4 weeks instead of the 12 weeks required using the WLTR method, it needs no correction factor for the uptake of preservative, it is non-destructive and therefore provides more long term data on the fungal attack and it allows sequential measurements over several months. The RTR values for pentachlorophenol were determined in four consecutive years and agreed within a multiplication factor of two, therefore confirming the acceptable reproducibility of the system. Both RTR and WLRT values obtained for creosote, pentachlorophenol and chromated copper arsenate were similar. The American standard strain of Lenzite trabea would seem to be losing its previous tolerance to pentachlorophenol. The RTR method verified the tolerance of Lentinus lepideus to creosote and Poria monticola to chromated copper arsenate. It also proved an oxathiin-Captan mixture to be as toxic as pentachlorophenol to some standard wood-destroying brown-rot fungi.

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