Fungal Decay Resistance of Loblolly Pine or Sweetgum Reacted with Aqueous Potassium Iodate

Authors

  • George C. Chen

Keywords:

Potassium iodate, complexation, fungal decay resistance, Gloeophyllum trabeum, Coriolus versicolor, loblolly pine, sweetgum

Abstract

In this study, we investigated the protection of wood based on complexation of biocides with wood. We found that loblolly pine and sweetgum wood blocks soaked in aqueous potassium iodate for 1 day resisted decay by brown- and white-rot fungi even after 2 weeks of water leaching. Threshold retentions of iodate for Gloeophyllum trabeum were 0.5 and 1% by weight of iodate solution in wood for unleached and leached blocks, respectively. For Coriolus versicolor, the threshold retention was 0.1% for both unleached and leached blocks. Retention of iodate in leached wood ranged from 21 to 73% that of unleached wood. Retentions of iodate were higher in loblolly pine than in sweetgum. Infrared spectrum of iodate-reacted wood indicated that iodate forms complexes with cell-wall polymers of wood, probably with cis diols of hemicelluloses and lignin. However, the intensity of this absorption was weak. Also, a small amount of oxidation of lignin in wood was found.

References

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Published

2007-06-19

Issue

Number 2 / April 1995

Section

Research Contributions

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