Microwave-assisted organic acids extraction of chromate copper arsenate (CCA)-treated southern pine

  • Authors: Yu, Bin; Hse, Chung Y.; Shupe, Todd F.
  • Publication Year: 2010
  • Publication Series: Miscellaneous Publication
  • Source: In: The 41st Annual Meeting of the International Research Group on Wood Protection. Biarritz, France: International Research Group on Wood Protection. 1-10.

Abstract

The extraction effects of acid concentration, reaction time and temperature in a microwave reactor on recovery of CCA-treated wood were evaluated. Extraction of copper, chromium, and arsenic metals from chromated copper arsenate (CCA)-treated southern pine wood samples with two different organic acids (i.e., acetic acid and oxalic acid) was investigated using a microwave reactor. Oxalic acid was effective in removing 100% of the chromium and arsenic at 160ºC and 30 min. reaction time. Acetic acid could remove 98% of the copper and arsenic at the same condition. Oxalic acid significantly improved the extraction efficiency of arsenic and chromium when time was prolonged from 10min. to 30min. The HSAB (Pearson acid base concept) concept was applied to explain why oxalic acid removed more chromium and less copper compared with acetic acid. Acetic acid also showed an improved ability to remove arsenic and copper when the reaction temperature was increased from 90ºC to 160ºC.

  • Citation: Yu, Bin; Hse, Chung Y.; Shupe, Todd F. 2010. Microwave-assisted organic acids extraction of chromate copper arsenate (CCA)-treated southern pine. In: The 41st Annual Meeting of the International Research Group on Wood Protection. Biarritz, France: International Research Group on Wood Protection. 1-10.
  • Keywords: CCA, recovery, microwave, extraction, HSAB
  • Posted Date: August 23, 2010
  • Modified Date: September 9, 2010
  • Requesting Print Publications

    Publication requests are subject to availability. Fiscal responsibility limits the hardcopies of publications we produce and distribute. Electronic versions of publications may be downloaded, distributed and printed.

    Please make any requests at pubrequest@fs.fed.us.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.