期刊
JOURNAL OF STORED PRODUCTS RESEARCH
卷 47, 期 2, 页码 63-68出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jspr.2010.04.006
关键词
Timber; Fumigation penetration; Alternative fumigants; Methyl bromide; Sorption of fumigant
类别
To evaluate timber fumigants alternative to the ozone-depleting methyl bromide (MB), pinewood (Oregon, Pseudotsuga menziesii) blocks (10 cm x 10 cm x 30 cm) were fumigated in a stainless steel chamber (30.0 L). The timber blocks were fumigated at 48 mg L-1 of MB, sulfuryl fluoride (SF) and ethanedinitrile (C2N2) and 1 mg L-1 of phosphine (PH3) for 48 h. During fumigation, 70% MB, 35% SF, 63% C2N2 and 25% PH3 were absorbed by the timber block. At 6-h exposure, the concentrations of SF, PH3 and C2N2 in the headspace of the chamber were stable. Each fumigant penetrated to all parts of the block, but the speed and extent of penetration were different. The fumigants that MOST rapidly achieved an even concentration throughout the block and chamber were PH3 and C2N2. The maximum variation of MB, SF, C2N2 and PH3 concentration between the chamber and gas port (15 cm) was 81.3,11.8,1.5 and 9.3% at 24-h exposure and 76.8, 9.3, 0.5 and 1.1% at 48-h exposure respectively. Possible alternative fumigants to MB need to penetrate timber at least as well as MB; SF, PH3 and C2N2 met this criterion. Crown copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
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