Distribution of Toxic Elements in Douglas-Fir Plywood Treated with Czaa Preservative

Authors

  • J. Rak

Keywords:

Pseudotsuga menziesii, Abiee sp., Picea sp., Tsuga sp., Larix sp., preservative treatments, copper-zinc-arsenic-additive preservative (CZAA), plywood, atomic adsorption spectrophotometry, microscopic examination

Abstract

Fifteen Douglas-fir plywood panels were treated with a copper-zinc-arsenic additive preservative (CZAA) in an ammoniacal solution in a full-cell process. Individual plies from the centers of the treated panels were assayed for CuO. ZnO, and As2 O5 on the basis of Cu, Zn, and As content by atomic adsorption spectrophotometry. Retentions of preservative oxides and their distribution in the plies as judged from copper-containing compounds indicated that treated panels could be well protected against biodegradation.

Microscopic identification of species revealed that inner plies were made from fir, spruce, and hemlock. The preservative in them, monitored by copper-containing compounds, was evenly spread in the core plies.

References

CSA Standard 080 on Wood Preservation. 1974. Canadian Standards Association, Rexdale, Ont.nFindlay, W. P. K., and J. G. Savory. 1954. Moderfäule. Die Zersetzung von Holz durch niedere Pilze. Holz Roh-Werkst. 12(8):293-296.nHulme, M. A., and J. A. Butcher. 1977. Soft-rot control in hardwoods treated with chromated copper arsenate preservatives I. Treatment problems. Mater Org. 12(2):81-95.nKrzyzewski, J., J. Rak, T. Szabo, and M. Hulme. 1977. Industrial treatments of Douglas-firplywood with two ammoniacal preservatives. Ottawa, Environ. Can. Inf. Rep. OPXOOO.nMacLean, J. D. 1935. Manual of preservative treatment of wood by pressure. U.S. Dep. Agric. Misc. Publ. No. 224.nRak, J. 1976. Leaching of toxic elements from spruce treated with ammoniacal solutions of copperzinc-arsenic preservatives. Wood Sci. Technol. 10(1):47:56.nRak, J. 1977. Complex analytical determination of arsenic by atomic adsorption spectrophotometry for wood preservation purposes. (in preparation for press).n

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Published

2007-06-28

Issue

Number 1 / Spring 1979

Section

Research Contributions

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