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    Description

    Composite sampling is standard practice for evaluation of preservative retention levels in preservative-treated wood. Current protocols provide an average retention value but no estimate of uncertainty. Here we describe a statistical method for calculating uncertainty estimates using the standard sampling regime with minimal additional chemical analysis. This tool can be used by wood treaters to generate lower prediction intervals that with a certain level of confidence give lower bounds on preservative retention estimates for a future analysis (e.g., by a customer) indicating whether the treated wood charge would result in a below-target retention value.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Lebow, Patricia K.; Taylor, Adam M.; Young, Timothy M. 2015. A tool for estimating variability in wood preservative treatment retention. Forest Products Journal. 65(5-6): 278-284.

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    Keywords

    quality control, composite sampling, prediction interval, preservative, retention

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https://www.fs.usda.gov/treesearch/pubs/49708