This study evaluated boron diffusion from raw boron minerals ulexite and colemanite with low water solubility in comparison to disodium octaborate tetrahydrate (DOT). Tests were conducted using sugi (Cryptomeria japonica (L.) f. D. Don) sapwood and heartwood blocks conditioned to 30, 60, and 90% target moisture content. The blocks were filled with the boron compounds through treatment holes and diffusion was observed at three assay zones across the blocks after 7, 30, 60 or 90-day incubation period at room temperatures. For comparison, ethylene glycol was also introduced into the holes to elevate boron diffusion. As expected, diffusion increased with increased moisture content and levels were higher at the 60% and 90% moisture levels compared to the 30% level. With some exceptions, boron levels did not follow consistent gradients with distance away from the treatment hole. Incorporation of ethylene glycol helped increase boron levels, even in heartwood blocks. Boron levels were higher from the ulexite source than from colemanite; however, DOT treatments resulted in the highest boron diffusion rates as a result of greater water solubility compared to both raw boron minerals. The results suggest that ulexite together with ethylene glycol may be useful in both sapwood and heartwood materials when kept at high moisture levels for extended periods.

这项研究评估了与八水合四水合八水二钠（DOT）相比，水溶性低的原始硼矿物方解石和硬锰矿中硼的扩散。测试使用sugi（Cryptomeria japonica（如果。D. Don）边材和心材块的目标水分含量调节为30％，60％和90％。在室温下孵育7、30、60或90天后，通过处理孔将硼化合物填充到块中，并在整个块的三个测定区域观察到扩散。为了比较，还将乙二醇引入孔中以提高硼的扩散。正如预期的那样，扩散随着水分含量的增加而增加，并且水分含量在60％和90％时高于30％。除某些例外，硼水平在远离处理孔的距离上没有遵循一致的梯度。甚至在心材块中，乙二醇的混入也有助于提高硼含量。钠钠石来源的硼含量高于钴锰矿；然而，与两种原始硼矿物质相比，DOT处理具有更高的水溶性，因此硼扩散率最高。结果表明，在高水分含量下长时间保持时，方钠石和乙二醇可用于边材和心材。