Abstract：
To ensure unbiased tree-ring radiocarbon (14C) results, traditional pretreatments carefully isolate wood cellulose from extractives using organic solvents, among other chemicals. The addition of solvents is laborious, time-consuming, and can increase the risk of carbon contamination. Tropical woods show a high diversity in wood-anatomical and extractive composition, but the necessity of organic-solvent extraction for the 14C dating of these diverse woods remains untested. We applied a chemical treatment that excludes the solvent step on the wood of 8 tropical tree species sampled in South-America and Africa, with different wood-anatomical and extractive properties. We analyzed the success of the extractive removal along with several steps of the α-cellulose extraction procedure using Fourier Transform Infrared (FTIR) spectroscopy and further confirmed the quality of 14C measurements after extraction. The α-cellulose extracts obtained here showed FTIR-spectra free of signals from various extractives and the 14C results on these samples showed reliable results. The chemical method evaluated reduces the technical complexity required to prepare α-cellulose samples for 14C dating, and therefore can bolster global atmospheric 14C applications, especially in the tropics.
摘要：
为了确保无偏差的树环放射性碳(14C)结果，传统的预处理使用有机溶剂小心地将木材纤维素从提取物中分离出来，在其他化学品中。溶剂的添加是费力的,耗时,并且会增加碳污染的风险。热带木材在木材解剖和提取成分方面表现出高度多样性，但是，对于这些不同木材的14C测年，有机溶剂萃取的必要性尚未测试。我们对南美和非洲采样的8种热带树种的木材进行了化学处理，不包括溶剂步骤，具有不同的木材解剖和提取特性。我们使用傅立叶变换红外（FTIR）光谱法分析了提取去除的成功以及α-纤维素提取程序的几个步骤，并进一步确认了提取后14C测量的质量。此处获得的α-纤维素提取物显示出没有来自各种提取物的信号的FTIR光谱,并且这些样品的14C结果显示出可靠的结果。评估的化学方法降低了制备用于14C测年的α-纤维素样品所需的技术复杂性，因此可以支持全球大气14C的应用，尤其是在热带地区.
