Effect of polyvinyl alcohol on copper leaching from treated wood

The new copper-based preservative systems leach a relatively high level of copper and, thus, generate some environmental concerns. Polyvinyl alcohol (PVOH) is known to complex with copper(II) and is water soluble. The effect of co-addition of fully hydrolyzed PVOH on the leaching of copper from wood...

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Bibliographic Details
Published in:Forest products journal 2009-10, Vol.59 (10), p.28-30
Main Authors: Vasishth, P, Nicholas, D.D, Henry, W.P, Schultz, T.P
Format: Article
Language:English
Subjects:
ammoniacal copper carbonate
Arsenic
Atmospheric pressure
Binding sites
Chemical properties
coordination compounds
Copper
copper acetate
copper carbonate
copper sulfate
Forest products industry
Impact analysis
Leaching
Ligands
poly(vinyl alcohol)
Polymers
Polyvinyl alcohol
solutions
Statistical analysis
Studies
Wood
wood preservation
Wood preservatives
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Summary:The new copper-based preservative systems leach a relatively high level of copper and, thus, generate some environmental concerns. Polyvinyl alcohol (PVOH) is known to complex with copper(II) and is water soluble. The effect of co-addition of fully hydrolyzed PVOH on the leaching of copper from wood treated with three different copper salts was examined. Southern pine sapwood wafers were treated with copper sulfate, copper acetate, and ammoniacal copper carbonate, all with 1 percent elemental copper in the waterborne solution, with and without 2 percent PVOH. The wafers were then dried and water leached for 2 weeks. PVOH co-addition greatly reduced the copper leached from wood treated with alkaline ammoniacal copper carbonate but not from wood treated with a slightly acidic solution of copper acetate or highly acidic copper sulfate.
ISSN:0015-7473
2376-9637
DOI:10.13073/0015-7473-59.10.28