Department of Earth System Science, University of California Irvine, Irvine, CA 92697-3100, USA.
Department of Earth System Science, University of California Irvine, Irvine, CA 92697-3100, USA.
Sci Total Environ. 2024 Nov 1;949:175010. doi: 10.1016/j.scitotenv.2024.175010. Epub 2024 Jul 23.
To ensure unbiased tree-ring radiocarbon (C) 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 C 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 C measurements after extraction. The α-cellulose extracts obtained here showed FTIR-spectra free of signals from various extractives and the C results on these samples showed reliable results. The chemical method evaluated reduces the technical complexity required to prepare α-cellulose samples for C dating, and therefore can bolster global atmospheric C applications, especially in the tropics.
为了确保树木年轮放射性碳（C）分析结果无偏，传统的预处理方法使用有机溶剂等化学物质，小心地将木材纤维素与提取物分离。添加溶剂既费力又耗时，并且会增加碳污染的风险。热带木材在木材解剖学和提取物组成方面表现出高度的多样性，但这些多样的木材进行 C 年代测定是否需要有机溶剂提取仍未得到检验。我们对来自南美洲和非洲的 8 种具有不同木材解剖学和提取物特性的热带树种的木材应用了一种不使用溶剂的化学处理方法。我们使用傅里叶变换红外（FTIR）光谱分析了提取过程中去除提取物和α-纤维素提取步骤的成功情况，并在提取后进一步确认了 C 测量的质量。这里获得的α-纤维素提取物的 FTIR 光谱中没有来自各种提取物的信号，并且这些样品的 C 结果显示出可靠的结果。评估的化学方法降低了为 C 年代测定准备α-纤维素样品所需的技术复杂性，因此可以支持全球大气 C 的应用，特别是在热带地区。
