SQUEAKY CLEAN CELLULOSE: COMPARING PRETREATMENT EFFECTIVENESS ON SINGLE TREE RINGS AND WOODEN LATHS

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Radiocarbon Pub Date : 2024-04-04 DOI:10.1017/rdc.2024.20
Wendy Hlengiwe Khumalo, Helene Løvstrand Svarva, Damaris Zurbach, Marie-Josée Nadeau
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Abstract

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.
吱吱作响的洁净纤维素:比较单个树环和木板条的预处理效果
从木材样本中获取准确的放射性碳(14C)结果需要提取纤维素。在过去,提取纤维素需要使用不同的方法组合,包括酸化漂白、酸-碱-酸和强碱。在大多数分析中,这往往是一项耗时的工作,尤其是需要从木材样本中提取单环同位素年代学时更是如此。利用 14C 和傅立叶变换红外光谱(FTIR),我们测试了四种不同的预处理方法,以确定它们生成高质量纤维素的能力。然后,我们对最佳方法进行了调整,确定了一种用于预处理多环木板条的方法。与 Bomb20 北半球 1 区曲线相比,碱-酸-碱-酸-漂白+强碱(BABAB+)和 BABAB 的序列产生了最准确的结果,Δ14C 的平均差异分别为 1.3‰ 和 5.8‰。对这些方法进行调整后,可对整块木板条进行预处理,傅立叶变换红外光谱(FTIR)结果比较表明,调整后的 BABAB+ 和 BABAB 所产生的高质量纤维素可与单独预处理的环相媲美。对木板条样本进行预处理有可能使一周内可预处理的树环数量增加一倍以上。这大大缩短了制作长树龄年表的时间。
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
审稿时长
6-12 weeks
期刊介绍: Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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