Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy
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Wei Xue
Abstract
Sapwood sawdust from southern pine was treated with micronized copper (MC) under various conditions and the mobilized copper(II) (Cumob) concentrations were determined in the treated wood by electron paramagnetic resonance (EPR) spectroscopy. The spectral parameters for the copper sulfate (CuSO4)-treated sapwood and those of the MC-treated sapwood were very similar. A linear correlation was found between the intensities of copper (Cu) EPR spectra and those of Cu energy-dispersive X-ray fluorescence spectroscopy in a series of CuSO4-treated sapwood reference samples. Thus, the EPR signal intensities could be reliably correlated to the mass of reacted Cu present using this calibration curve. The amount of the Cumob in sawdust treated by MC suspensions increased during the first 2–3 days after the initial treatment and then reached a maximum during the 7-day monitoring period. In the case of the treatment with MC alone or MC azole, an increased MC concentration led to an elevated amount of Cu (to a maximum of ∼0.23% Cu) solubilized by the sapwood. If the wood was treated with MC quat, the Cumob initially increased, but at higher concentrations the Cumob content decreased, due to the interference by the quat cobiocide on the acid reaction between the wood and the basic Cu carbonate. An examination of commercially-treated wood confirmed the laboratory observations.
The authors are pleased to acknowledge support from Osmose, Inc., and Timber Specialties Co. for this research. Quaternary ammonium carbonate analyses were conducted by L. McCuaig (F.P Innovations, Vancouver, British Columbia, Canada).
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Articles in the same Issue
- Masthead
- Masthead
- Reviews
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- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture
- Original Articles
- Molecular weight distributions of acetylated lignocellulosic biomasses recovered from an ionic liquid system
- Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design
- Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp
- Mechanical performance of yew (Taxus baccata L.) from a longbow perspective
- Predicting Douglas-fir wood density by artificial neural networks (ANN) based on progeny testing information
- The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
- Fire resistance of wood treated with various ionic liquids (ILs)
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- Drying of beech (Fagus sylvatica L.) timber in oscillation climates: drying time and quality
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