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Soft rot tests with soils of different origins
1984 - IRG/WP 2226
In the BAM a comparative soft rot test with 9 different types of soil (one soil each from Canada, New Zealand and Switzerland and 6 soils from laboratories in Germany) were carried out. The pH values of the different soils ranged from 3.2 to 7.1, and the amounts of organic matter were between 4 and 44% (w/w). The test specimens - Pine sapwood blocks treated with different concentrations of a CCA preservative - were the same for all tests as well as the test vessels and the test conditions. The weight losses which were determined after an 18-week test period were 5...22% of the untreated controls; the lowest decay rates were obtained in the soils with the lowest pH values (3.2 to 4.7). Despite the very different characteristics of the 9 test soils used, the same toxic limits of 4.9 to 7.3 kg/m³ of the tested CCA preservative were obtained; apart from 2 soils where they were lower by one concentration. The final moisture contents of the untreated controls ranged from 55...169% (w/w), those of the blocks treated with 1% CCA solution were 33...67% (w/w).
M Gersonde, W Kerner