A preliminary study of preservative retention and penetration in ACQ-treated timbers using near infrared spectroscopy

  • Authors: So, Chi-Leung; Eberhardt, Thomas L.; Lebow, Stan T.; Groom, Leslie H.
  • Publication Year: 2006
  • Publication Series: Miscellaneous Publication
  • Source: Wood Protection, 2006 : March 21-23, 2006 ... New Orleans, Louisiana, USA. Madison, WI : Forest Products Society, 2006: Pages 367-370.

Abstract

Near infrared (NIR) spectroscopy has been previously used in our laboratory to predict copper, chromium, and arsenic levels in samples of chromated copper arsenate (CCA)-treated wood. In the present study, we utilized our custom-made NIR scanning system, NIRVANA (near infrared visual and automated numerical analysis), to scan cross sections of ACQ (alkaline copper quat)- treated timbers to assess whether this technology can be used as a quality control tool for wood treaters. Models for CuO retention were created using ACQ-treated and untreated southern yellow pine (SYP) wood blocks. Strong correlations were obtained between the CuO retentions predicted by NIR and those based on elemental analysis. NIRVANA was then utilized for automated spectra collection from ACQ-treated SYP timbers. The resultant plots showed both the variation of CuO retention and the preservative penetration depth along the specimens from the pith to the timber surface. NIRVANA appears to be ideally suited to the assessment of ACQ- treated timber providing both rapid and detailed analysis of the preservative treatment applied to the timber. This preliminary study will be extended to other preservative components (e.g., organic co-biocides), in which the preservative penetration and concentration cannot be readily assessed.

  • Citation: So, Chi-Leung; Eberhardt, Thomas L.; Lebow, Stan T.; Groom, Leslie H. 2006. A preliminary study of preservative retention and penetration in ACQ-treated timbers using near infrared spectroscopy. Wood Protection, 2006 : March 21-23, 2006 ... New Orleans, Louisiana, USA. Madison, WI : Forest Products Society, 2006: Pages 367-370.
  • Keywords: Preservative treated wood, copper, wood preservatives, preserved wood, near infrared spectroscopy, numerical analysis, mathematical analysis, NIRVANA, Near Infrared Visual and Automated Numerical Analysis, treated wood, southern yellow pine, preservatives, alkaline copper quat, ACQ, penetration
  • Posted Date: October 16, 2007
  • Modified Date: October 16, 2007
  • Print Publications Are No Longer Available

    In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the Government Printing Office (GPO). Electronic versions of publications may be downloaded, printed, and distributed.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • To view this article, download the latest version of Adobe Acrobat Reader.