在 GXNU-AMS 实验室检测水中碳酸盐和二酸酯的样品制备系统

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Radiocarbon Pub Date : 2024-09-18 DOI:10.1017/rdc.2024.65

Hongtao Shen, Linjie Qi, He Ouyang, Xinyi Han, Guofeng Zhang, Dingxiong Chen, Kaiyong Wu, Junsen Tang, Li Wang, Ning Wang, Xiaojun Sun, Ming He, Kimikazu Sasa, Jiang Shan

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引用次数: 0

摘要

广西师范大学建立了一条从水中的碳酸盐和溶解无机碳（DIC）中提取二氧化碳的新型真空管道。该真空管路由两个主要部分组成：CO2 气泡循环区和 CO2 净化收集区，两个部分均由石英玻璃和金属管道制成。为了验证其可靠性，使用该系统制备了一系列碳酸盐样品。二氧化碳萃取和石墨化的总回收率超过了 80%。此外，碳酸钙中的碳含量与系统内的二氧化碳压力呈线性关系，证明了该系统的稳定性和可靠性。该系统还用于制备和分析各种样品，包括碳酸钙空白样品、有孔虫、贝壳、地下水和地下油水样品。加速器质谱分析（AMS）结果表明，样品中 12C- 的平均束流超过 40 μA。此外，在液体样品制备过程中引入的污染约为 (1.77 ± 0.57) × 10-14。总体而言，水中碳酸盐和 DIC 的石墨化制备系统表现出高效率和高回收率，满足了可追溯到约 30,000 年前的样品的要求。

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SAMPLE PREPARATION SYSTEM FOR CARBONATE AND DIC IN WATER AT THE GXNU-AMS LABORATORY

A new vacuum line to extract CO2 from carbonate and dissolved inorganic carbon (DIC) in water was established at Guangxi Normal University. The vacuum line consisted of two main components: a CO2 bubble circulation region and a CO2 purification collection region, both of which were made of quartz glass and metal pipelines. To validate its reliability, a series of carbonate samples were prepared using this system. The total recovery rate of CO2 extraction and graphitization exceeded 80%. Furthermore, the carbon content in calcium carbonate exhibited a linear relationship with the CO2 pressure within the system, demonstrating its stability and reliability. The system was also employed to prepare and analyze various samples, including calcium carbonate blanks, foraminiferal, shell, groundwater, and subsurface oil-water samples. The accelerator mass spectrometry (AMS) results indicated that the average beam current for 12C- in the samples exceeded 40 μA. Additionally, the contamination introduced during the liquid sample preparation process was approximately (1.77 ± 0.57) × 10−14. Overall, the graphitized preparation system for carbonate and DIC in water exhibited high efficiency and recovery, meeting the requirements for samples dating back to approximately 30,000 years.

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

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.