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Fig. 1. Changes of percentage residual amount of arsenic, copper, or chromium in preservative-treated wood powder during sodium oxalate solvent extraction. The percentage residual elements content in the wood was defined as (element content in the wood after extraction)/(element content in the wood before extraction) x 100. (a) Percentage residual amount of arsenic, copper, and chromium in chromated copper arsenate (CCA)–treated wood powder during sodium oxalate solvent extraction. (b) Percentage residual amount of copper in ammoniacal copper quaternary (ACQ)–treated wood powder during sodium oxalate solvent extraction. (c) Percentage residual amount of copper in copper, boron, and azole (CuAz)–treated wood powder during sodium oxalate solvent extraction.
