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Fig. 2. Changes of percentage residual amount of arsenic, copper, or chromium in chromated copper arsenate (CCA)–treated wood chips during sodium oxalate solvent extraction. (a) Percentage residual amount of arsenic, copper, and chromium in CCA-treated wood chips during sodium oxalate solvent extraction. (b) Percentage residual amount of copper in ammoniacal copper quaternary (ACQ)–treated wood chips during sodium oxalate solvent extraction. (c) Percentage residual amount of copper in copper, boron, and azole (CuAz)–treated chips during sodium oxalate solvent extraction. (d) Percentage residual amount of arsenic, copper, and chromium in the mixture of CCA-, ACQ-, and CuAz-treated wood chips during sodium oxalate solvent extraction.
