Distribution of boron in wood treated with aqueous and methanolic boric acid solutions |
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Authors: | Shigeru Yamauchi Yoichi Sakai Yasuo Watanabe Michael Kenya Kubo Hideaki Matsue |
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Institution: | (1) Institute of Wood Technology, Akita Prefectural University, 11-1 Kaieisaka, Noshiro 016-0876, Japan;(2) Department of Chemistry, School of Liberal Arts and Sciences, Daido Institute of Technology, Nagoya 457-8530, Japan;(3) Crystals Division, Saint-Gobain K.K., Tokyo 102-0083, Japan;(4) Division of Natural Sciences, College of Liberal Arts, International Christian University, Tokyo 181-8585, Japan;(5) Quantum Beam Science Directorate, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan |
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Abstract: | The distributions of boron in Japanese cedar (Cryptomeria japonica D. Don) sapwood blocks treated with aqueous or methanolic boric acid B(OH)3] solutions were explored through Raman spectroscopy and prompt gamma-ray analysis (PGA). B(OH)3 was the sole boron species observed in Raman spectra of the wood blocks treated with either solution. Plots of weight gain
of the treated wood blocks versus boron concentration in treatment solutions were found to be linear. The results indicated
that the methanolic solution makes it possible to impregnate wood with much larger amounts of boron than the aqueous solution.
PGA confirmed that B(OH)3 was highly enriched near the end grains of the treated wood blocks. Raman measurements suggested that boron content in the
bulk of the wood block is not as large as expected from the weight gain of the treated wood blocks when an ordinary air-drying
method is used. It was concluded that the aqueous solution impregnates the cell walls of wood with boron more easily than
the methanolic solution.
Part of this report was presented at the 55th (Kyoto, March 2005) and 56th (Akita, August 2006) Annual Meetings of the Japan
Wood Research Society. This article follows the previous rapid communication “Analysis of boron in wood treated with boric
acid solutions using Doppler broadening method of prompt gamma-rays.” J Wood Sci (2006) 52:279–281 |
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Keywords: | Boric acid Methanol Prompt gamma-ray analysis Raman spectroscopy Wood preservative |
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