Morphologie und systematische Verbreitung der lebenden Holzfasern bei Sträuchern und Bäumen. II. Zur Histologie
Morphologie und systematische Verbreitung der lebenden Holzfasern bei Sträuchern und Bäumen. II. Zur Histologie
复制标题
II. 组织学
DOI：
10.1515/hfsg.1970.24.5.141
复制
发表时间：
1970
期刊：
影响因子：
--
通讯作者：
F. Wolkinger
中科院分区：
文献类型：
--
作者：
F. Wolkinger
obtained using two Eucalyptus spp. (Johanson in press). Species differences exerted a strong influence on the formation of the highly fixed arsenic fraction. Fixation reactions could include degrees of binding from weak adsorptive forces to strong chemical bonding with wood substances. The fixation process is complex but whatever its pathways the presence of wood appears to be an important factor. In this connection arsenic in arsenical creosote has been shown to have less resistance to water extraction than when in creosoted wood (Johanson 1967). This suggests that As2O3 is retained in the form of either organic compounds of arsenic, or by reaction of such compounds with wood substance. In the present study, the effect of the substrate on fixation is somewhat masked by the overwhelming influence of fixation temperature. Pinus radiata differs from sapwood of eucalypts which appear to be more reactive with the arsenical constituents (Johanson in press). The eucalypt specimens, although not subjected to a fixation heating process after treatment with an arsenical preparation, had proportionally more toluene resistant arsenic than those of Pinus radiata. They also had more arsenic which was resistant to 2 years of water leaching followed by toluene extraction. Under similar conditions of retention and depth of sapwood penetration some eucalypts should show better performance in retaining arsenic than Pinus radiata. The large increase in arsenic fixation occurring when treated Pinus radiata is conditioned at 95° C indicates that much of the potential reactivity of the arsenical creosote-wood system is wasted if the treated wood is not so conditioned. If this potential reactivity was not available, no increase in fixation would have been observed. Acknowledgments The author wishes to thank Miss N. Ditchburne of the Division of Mathematical Statistics, CSIRO, for help with the statistical evaluation of the experimental data; and Mr. T. Syers and Miss M. Siggs of the Division of Forest Products, CSIRO, for their assistance with chemical analyses.
