Obtaining accurate radiocarbon (14C) results from wood samples requires the extraction of cellulose. In the past, this has been done using different combinations of methods including acidified bleaching, acid-base-acid, and strong bases. This often becomes a time-consuming task in most analyses, especially when single ring isotope chronologies are needed from wood samples. Using 14C and Fourier-transform infrared spectroscopy (FTIR), we tested four different pretreatment methods to determine their ability to produce high quality cellulose. We then adjusted the best methods to determine a method for pretreating wood laths of multiple rings. A sequence of base-acid-base-acid-bleach + strong base (BABAB+) and BABAB produced the most accurate results when compared to the Bomb20 Northern Hemisphere Zone 1 curve with an average difference in Δ14C of 1.3‰ and 5.8‰ respectively. These methods were adjusted to pretreat an entire wood lath and a comparison of the FTIR results suggest that our adjusted BABAB+ and BABAB produced high quality cellulose comparable to that of an individually pretreated ring. The possibility to pretreat wood lath samples has the potential to more than double the number of tree rings which can be pretreated in a week. This is a significant reduction in time when creating long tree ring chronologies.

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干净的纤维素：比较单环树和木板条的预处理效果

获取准确的放射性碳（14C) 木材样品的结果需要提取纤维素。过去，这是通过不同的方法组合来完成的，包括酸化漂白、酸-碱-酸和强碱。在大多数分析中，这通常成为一项耗时的任务，特别是当需要从木材样品中获取单环同位素年代学时。使用14通过 C 和傅里叶变换红外光谱 (FTIR)，我们测试了四种不同的预处理方法，以确定它们生产高质量纤维素的能力。然后我们调整了最佳方法，确定了多环木板条的预处理方法。与 Bomb20 北半球 1 区曲线相比，碱-酸-碱-酸-漂白剂 + 强碱 (BABAB+) 和 BABAB 的序列产生了最准确的结果，平均差异为 Δ14C分别为1.3‰和5.8‰。调整这些方法以预处理整个木板条，FTIR 结果的比较表明，我们调整后的 BABAB+ 和 BABAB 产生的高质量纤维素与单独预处理的环相当。对木板条样品进行预处理的可能性有可能使一周内可预处理的树木年轮数量增加一倍以上。创建长树木年轮年表时，这会显着减少时间。