| UTEVA树脂分离纯化珊瑚中铀、钍的改进研究 |
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| 引用本文： | 汤震宇,瞿建国,张安余,李秀保,杜金洲.UTEVA树脂分离纯化珊瑚中铀、钍的改进研究[J].海洋学报,2022,44(2):11-20. |
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| 作者姓名： | 汤震宇 瞿建国 张安余 李秀保 杜金洲 |
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| 作者单位： | 1.华东师范大学 河口海岸学国家重点实验室，上海 200241 |
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| 基金项目： | 河口海岸学国家重点实验室开放课题(2019RCDW04,SKLEC-KF201907)。 |
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| 摘 要： | 珊瑚是记录海洋环境变化信息的载体之一,测定其U/Ca比值可重建海水温度或测定Th/U同位素比值可计算年龄重建海平面高度等.准确测定珊瑚中U、Th含量及同位素比值是提取所记载的海洋环境变化信息的前提,其难点在于高Ca基体分离和痕量U、Th富集纯化.基于此,本研究拟采用UTEVA树脂改进了一步富集分离珊瑚中U、Th的前处理...
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| 关 键 词： | 珊瑚 铀 钍 UTEVA树脂 电感耦合等离子体质谱法 |
| 收稿时间： | 2021-09-18 |
Modified method of separation and purification of U,Th in coral sample with UTEVA resin |
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| Tang Zhenyu,Qu Jianguo,Zhang Anyu,Li Xiubao,Du Jinzhou.Modified method of separation and purification of U,Th in coral sample with UTEVA resin[J].Acta Oceanologica Sinica (in Chinese),2022,44(2):11-20. |
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| Authors: | Tang Zhenyu Qu Jianguo Zhang Anyu Li Xiubao Du Jinzhou |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China2.Thermo Fisher Scientific (China) Limited Company, Shanghai 200125, China3.State Key Laboratory of Marine Resource Utilization in South China Sea, College of Marine Science, Hainan University, Haikou 570228, China |
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| Abstract: | Corals are one of the carriers for recording information about changes in the marine environment. For example, determining U/Ca to reconstruction of sea water temperature or measure the Th/U isotopic ratio for dating to reconstruction sea level etc. However, measuring the U and Th contents and isotopic ratio of corals is a prerequisite for extracting the recorded marine environmental change information, the difficulty lies in the separation of Ca matrix and enrichment and purification of trace U and Th. Based on this, this study modified the pretreatment method of separation and purification U and Th with single column stage of UTEVA resin, and then combined with high resolution inductively coupled plasma mass spectrometry to determine U and Th contents of corals. The results demonstrate that the HNO3 medium concentration decrease from 3 mol/L to 2 mol/L will not affect the absorption efficiency of U and Th; 2 mL Milli-Q water can completely elute U, which significantly reduces the procedure blank value of the entire process of U; the improved method is used to determine the U and Th contents of three Hainan littoral corals (n=6, 1σ): U are (3.46±0.02)μg/g, (2.67±0.05)μg/g, (2.15±0.07)μg/g, respectively, Th are (10.12±0.24)ng/g, (4.82±0.10)ng/g, (5.65±0.12)ng/g, respectively; and the determination accuracy is below 3.3%, recovery rate of standard addition of U, Th are 97.9%–100.9%, 97.3%–99.7%, respectively. The method has high accuracy and good precision. This study provides a more accurate, convenient and rapid experimental method for the analysis of U and Th content and isotopic ratio in corals and other carbonate samples. |
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| Keywords: | coral U Th UTEVA resin inductively coupled plasma mass spectrometry(ICP–MS) |
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