Standard leaching test for antisapstain chemicals / by Peter F. Krahn and Richard Strub. : En40-240-1/90-10E-PDF

"Research conducted by various government and private laboratories showed that antisapstain chemicals will leach from treated lumber. Various studies have been done to simulate this leaching in laboratory scale tests. Non-standard test conditions such as variations in lumber package sizes, intensity and duration of artificial rainfall and sampling frequency have made it difficult to relate the results between tests and to conditions which would normally be experienced by operating antisapstain facilities. Recent leaching studies conducted at various mills by Environment Canada have indicated that leachate dripping from treated lumber is diluted an average of 15 times by rainfall before it discharges from the storage yard. Numerous variables at individual mill sites caused a range of dilutions from 6 to 24 times. These observations led to the development of a standard leaching test which can be conducted using natural or artificial rain. The standard leaching test can be used to predict the concentrations of the antisapstain chemicals in the runoff at operating facilities. Environment Canada has recommended to Agriculture Canada that the test procedure be included in the registration requirements for new antisapstain formulations"--Executive summary, page i.

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